英语作文,实验报告[5篇材料]

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英文实验报告范文

英文实验报告范文求一篇英文的化学试验报告范文（Chemistry Lab sample(This is one of my Chemistry 11 lab assignment。

)Title:Cooling and Heating Curves of a Pure SubstanceObjectives:to investigate the cooling process for liquid paradichlorobenzeneto investigate the heating process for solid paradichlorobenzeneto determine and compare the melting and freezing temperatures of paradichlorobenzeneMaterials:Apparatus: rin stand and ring support buret clampbunsen burner; wire gauze with ceramic centre;test tube(18mm*150mm); beaker(400ml); 2thermometers; lab apron; safety goggles.Reagent: paradichlorobenzeneProcedure:It's freaking long for this lab and I can't type them all out. Basically, it is just what you do to complete the lab andlist them step by step. You can also draw diagrams if it's necessary.Data and observations:So generally, it's the data you record throughout the lab. Data table should be customized for each lab.Conclusion:Sum up your data and observations and come up with a conclusion。

关于写实验报告的英语作文

关于写实验报告的英语作文Experiment Report。

Today's experiment was a total disaster. Everythingthat could go wrong, did go wrong. First, the equipment malfunctioned, causing a delay in starting the experiment. Then, the chemicals we were using turned out to be expired, which completely ruined our results. It was a frustrating and disappointing experience.The lab environment was chaotic and noisy, with everyone rushing to finish their experiments before the deadline. The lack of organization and communication made it difficult to concentrate and stay focused on our own work. It was a stressful and overwhelming situation.Despite all the setbacks, we managed to salvage some data from the experiment. It may not be perfect, but it's better than nothing. We had to think on our feet and come up with alternative methods to gather the necessaryinformation. It was a challenging and demanding task.The team dynamics were strained during the experiment. Tensions ran high as we struggled to cope with the unexpected obstacles. There was a lot of frustration and blame thrown around, which created a negative and unproductive atmosphere. It was a tense and uncomfortable situation.In the end, we learned a valuable lesson from this experience. We realized the importance of being preparedfor the unexpected and staying calm under pressure. It was a humbling and eye-opening experience.Overall, the experiment was a rollercoaster of emotions and challenges. Despite the setbacks and frustrations, we managed to overcome the obstacles and gather some valuable data. It was a tough and demanding experience, but we came out of it stronger and wiser.。

高中英语作文：实验报告范文

烧水的实验报告英语作文范文一Water BoilingAim:1.To find out / observe the temperature when water is boiling.2.To find out what happens when water is boiling.Apparatus:a test tube, water, thermometer, Bunsen burnerMethod:1.Half-fill the test tube with water.2.Put the thermometer in the test tube with water.3.Heat the water in the test tube and watch the reading of thethermometer.Result:When the temperature reaches 100 degrees centigrade, bubbles begin to appear.Conclusion:1.Water boils when the temperature reaches 100 degrees centigrade.2.A lot of bubbles appear during the boiling.范文二The aim of the experiment is to observe the temperature when water boils and what happens in water during boiling. To carry out the experiment, you need the following equipment: a test tube, water, thermometer and Bunsen burner.First, half-fill the test tube with water. Then put the thermometer in it. Finally, heat the water, and observe the number / reading of thermometer. Now you can see that when the temperature reaches 100 degrees centigrade, plenty of bubbles form on the water surface. So we can draw a conclusion: water starts boiling at 100 degrees centigrade; in addition, plenty of bubbles appear during boiling.。

实验报告英语作文高一范文

The Science of Photosynthesis: AnExperimental Exploration**Experiment Purpose:** To investigate the process of photosynthesis and understand how plants convert light energy into chemical energy, utilizing carbon dioxide and water as reactants.**Materials Used:**1. Green plant leaves (preferably fresh and healthy)2. Beaker3. Distilled water4. Carbon dioxide gas5. Light source (such as a lamp or sunlight)6. Test tubes7. Syringe8. Timer**Procedure:**Step 1: Place a fresh green leaf in the beaker. Step 2: Add distilled water to cover the bottom of the beaker. Step 3: Inject a small amount of carbon dioxide gas into the beaker. Step 4: Position the light source above the beaker, ensuring that the leaf is exposed to direct light. Step 5: Cover the beaker with a transparent lid to trap any gases produced during the experiment. Step 6: Set a timer for 30 minutes and observe any changes in the leaf and the beaker.**Observations and Results:**During the 30-minute experiment, we observed a gradual change in the leaf. The leaf turned a darker shade of green, indicating an increase in chlorophyll production. Additionally, bubbles were observed forming on the surfaceof the water, indicating the production of oxygen gas as a by-product of photosynthesis.**Conclusion:** The experiment successfully demonstrated the process of photosynthesis. The plant leaf, exposed to light, converted the carbon dioxide and waterinto glucose (a sugar molecule) and oxygen gas. This conversion process, known as photosynthesis, is crucial for plant growth and survival, as it provides them with the energy needed for various biological processes.**Reflection:** This experiment was an eye-opening experience that allowed us to visually observe the奇妙的化学反应of photosynthesis. It reinforced my understanding of the importance of plants in maintaining the carbon dioxide-oxygen balance in our atmosphere. Additionally, it highlighted the role of light in driving this process,emphasizing the interconnectedness of all living thingswith the sun as their ultimate energy source.**建议和改进措施:** Future experiments could explorethe effect of different light intensities or wavelengths on photosynthesis rates. Additionally, using different plant species or varying environmental conditions could provide insights into the adaptability of photosynthesis across different plant species.**实验报告：光合作用的科学探索****实验目的：** 研究光合作用的过程，了解植物如何将光能转化为化学能，并利用二氧化碳和水作为反应物。

高中英语作文：实验报告

高中英语作文：实验报告第一篇：高中英语作文：实验报告烧水的实验报告英语作文范文一Water BoilingAim:1.To find out / observe the temperature when water is boiling.2.To find out what happens when water is boiling.Apparatus:a test tube, water, thermometer, Bunsen burnerMethod:1.Half-fill the test tube with water.2.Put the thermometer in the test tube with water.3.Heat the water in the test tube and watch the reading of thethermometer.Result:When the temperature reaches 100 degrees centigrade, bubbles begin to appear.Conclusion:1.Water boils when the temperature reaches 100 degrees centigrade.2.A lot of bubbles appear during the boiling.范文二The aim of the experiment is to observe the temperature when water boils and what happens in water during boiling.T o carry out the experiment, you need the following equipment: a test tube, water, thermometer and Bunsen burner.First, half-fill the test tube with water.Then put the thermometer in it.Finally, heat the water, and observe the number / reading of thermometer.Now you can see that when the temperature reaches 100 degrees centigrade, plenty of bubbles form on the water surface.So we can draw a conclusion: water starts boiling at 100 degrees centigrade;in addition, plenty of bubbles appear during boiling.第二篇：高中英语阅读技巧对比实验报告高中英语阅读技巧对比实验报告贵阳十四中杨新慧（550002）【内容提要】英语阅读教学是高中英语教学中的一个重点和难点。

实验报告英文作文

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文档下载后可定制随意修改，请根据实际需要进行相应的调整和使用，谢谢!并且，本店铺为大家提供各种各样类型的实用资料，如教育随笔、日记赏析、句子摘抄、古诗大全、经典美文、话题作文、工作总结、词语解析、文案摘录、其他资料等等，如想了解不同资料格式和写法，敬请关注!Download tips: This document is carefully compiled by theeditor. I hope that after you download them,they can help yousolve practical problems. The document can be customized andmodified after downloading,please adjust and use it according toactual needs, thank you!In addition, our shop provides you with various types ofpractical materials,such as educational essays, diaryappreciation,sentence excerpts,ancient poems,classic articles,topic composition,work summary,word parsing,copyexcerpts,other materials and so on,want to know different data formats andwriting methods,please pay attention!I did an experiment today. It was really interesting. I mixed some chemicals together and saw what happened. It made a big explosion! Another time, I measured the length of a stick. It was quite long. I used a ruler to do it. I also observed some plants growing. They looked so green and healthy. I watered them to help them grow better. Once I tried to build a model. It was difficult but I didn't give up. I kept working on it until it was done. And then there was this one experiment where I had to test the strength of a material. I pulled and pulled on it. It was quite strong actually.。

英文实验报告格式范文

英文实验报告格式范文英文实验报告格式范文Title: The Effect of Temperature on Enzyme ActivityAbstract:The purpose of this experiment was to determine how temperature affects the activity of the enzyme amylase. Three different temperatures were tested: 10°C, 25°C, and 45°C. The results showed that the rate of reaction increased as the temperature increased up to 45°C. However, at temperatures above 45°C, the rate of reaction began to decrease due to denaturation of the enzyme. The optimal temperature for amylase activity was found to be 45°C. These findings have important implications for the use of enzymes in industrial processes. Introduction:Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They are essential for life and are used in a wide range of industrial processes. Enzyme activity is affected by a number of factors, including temperature, pH, and substrate concentration. Temperature is one of the most important factors affecting enzyme activity. Enzymes have an optimal temperature at which they work most efficiently. At temperatures above or below thisoptimal temperature, the rate of reaction decreases. At very high temperatures, enzymes can become denatured and lose their ability to function.Materials and Methods:The experiment was performed using a solution of amylase enzyme and starch. Three test tubes were prepared, each containing 5 mL of the enzyme solution and 1 mL of starch solution. The test tubes were then heated to three different temperatures: 10°C, 25°C, and 45°C. The temperature was controlled using a water bath. A control test tube was also prepared, containing the same amount of enzyme and starch, but no temperature was applied. The reaction was allowed to proceed for 10 minutes, after which the test tubes were removed from the water bath and the absorbance of each solution was measured using a spectrophotometer.Results:The results showed that the rate of reaction increased as the temperature increased up to 45°C. At 10°C, the rate of reaction was very slow, with an absorbance reading of 0.010. At 25°C, the rate of reaction was faster, with an absorbance reading of 0.035. At 45°C, the rate of reaction was the fastest, with an absorbance reading of 0.080. However, at temperaturesabove 45°C, the rate of reaction began to decrease due to denaturation of the enzyme. The control test tube had an absorbance reading of 0.005, indicating that no reaction had taken place.Discussion:The results of this experiment demonstrate that temperature has a significant effect on the activity of the enzyme amylase. The optimal temperature for amylase activity was found to be 45°C. At temperatures above this, the enzyme began to denature and lose its activity. These findings have important implications for the use of enzymes in industrial processes. Industries that use enzymes must carefully control the temperature of their processes to ensure that the enzymes work efficiently.Conclusion:This experiment has shown that temperature has a significant effect on the activity of the enzyme amylase. The optimal temperature for amylase activity was found to be 45°C. These findings have important implications for the use of enzymes in industrial processes, where temperature control is crucial for ensuring efficient enzyme activity.。

英文实验报告作文

英文实验报告作文Experiment Report。

The experiment was a total disaster. Nothing went according to plan. The chemicals spilled everywhere, the equipment malfunctioned, and the results were completely unexpected. It was a complete mess from start to finish.I couldn't believe how poorly everything turned out. I had spent weeks preparing for this experiment, and it all fell apart in a matter of minutes. It was frustrating and disappointing, to say the least. I had high hopes for this project, but it was a total bust.Despite the failure of the experiment, I learned a valuable lesson. I learned that not everything in science goes as planned, and sometimes you have to be prepared for the unexpected. It was a humbling experience that taught me the importance of perseverance and adaptability in the face of challenges.Moving forward, I will take this experience as a learning opportunity. I will use it to improve my skills and become a better scientist. I will be more cautious in my preparations, double-check my equipment, and be ready to pivot if things don't go as expected. This experiment may have been a failure, but it will not define me as a scientist.In conclusion, the experiment was a disaster, but it was also a valuable learning experience. It taught me important lessons about resilience, adaptability, and the unpredictable nature of science. Despite the setbacks, I am determined to continue pursuing my passion for research and discovery. Failure is just a stepping stone on the path to success.。

高中实验报告英文作文

高中实验报告英文作文英文：As a high school student, I have had the opportunity to conduct various experiments in my science classes. Writing lab reports in English has been a challenge for me, but I have learned a few tips that have helped me improve.Firstly, it is important to clearly state the purpose of the experiment and the hypothesis. This not only helps the reader understand the experiment, but also helps me stay focused during the experiment. For example, when conducting an experiment on the effects of temperature on enzyme activity, I would state my hypothesis as "If the temperature increases, then the enzyme activity will also increase."Next, it is crucial to accurately record the data collected during the experiment. This includes the measurements and observations made during the experiment. Ifind it helpful to organize my data in tables or graphs, which makes it easier to analyze and draw conclusions.After collecting the data, it is important to analyzeit and draw conclusions. This involves looking for patterns and trends in the data and comparing it to the hypothesis. For example, if my hypothesis was proven true, I would state that "The results of the experiment support the hypothesis that an increase in temperature leads to an increase in enzyme activity."Finally, it is important to reflect on the experiment and suggest improvements for future experiments. This shows that I have a deeper understanding of the experiment and have thought critically about it.中文：作为一名高中生，在科学课上我有机会进行各种实验。

英文实验报告范例模板

Title:Investigation of [Experiment Name]Introduction:The purpose of this experiment is to [briefly describe the objective of the experiment]. This report outlines the methodology used, the results obtained, and the conclusions drawn from the experiment.Objective:To [state the specific objective of the experiment].Materials and Methods:1. Materials:- [List all the materials used in the experiment, e.g., chemicals, equipment, samples, etc.]2. Methods:- Step 1: [Description of the first step in the procedure]- Step 2: [Description of the second step in the procedure]- Step 3: [Description of the third step in the procedure]- ...- Step n: [Description of the final step in the procedure]Procedure:1. [Detailed description of the experimental procedure, including any measurements taken, observations made, or data recorded]2. [Any additional steps or modifications to the procedure]3. [Finalization of the experiment]Results:1. Data Collection:- [Present the data collected during the experiment in tables, figures, or graphs]- [Include raw data and any calculations performed]2. Analysis:- [Discuss the analysis of the data, including any statistical methods used]- [Present the results of the analysis]3. Discussion:- [Interpret the results in the context of the experiment's objective]- [Compare the results with existing literature or theories]- [Identify any unexpected results and possible explanations]Conclusion:Based on the results of this experiment, [state the main conclusion(s)]. The experiment [supported/refuted] the hypothesis that [briefly state the hypothesis]. Further research is needed to [suggest any additional studies or investigations].Discussion:1. Limitations:- [Discuss any limitations of the experiment, such as equipment limitations, sample size, or procedural issues]2. Recommendations:- [Suggest improvements to the experiment, such as using different equipment, modifying the procedure, or expanding the scope of the study]Appendices:- [Include any additional information, such as detailed data tables, code, or additional figures that support the experiment]References:- [List all the references cited in the report, following the appropriate citation style]Acknowledgments:- [Thank any individuals, institutions, or organizations that contributed to the experiment or report]Author Information:- [Include the author's name, affiliation, and contact information]---Note: This template is a general guideline and should be adapted to fit the specific requirements of the experiment and the reporting guidelines of the institution or journal.。

实验报告英语作文模板

实验报告英语作文模板英文回答：Introduction。

The purpose of this experiment was to investigate the effect of temperature on the rate of a chemical reaction. The reaction studied was the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The hypothesis was that the rate of the reaction would increase as the temperature increased.Methods。

The experiment was conducted by measuring the volume of oxygen produced over time at different temperatures. The following materials were used:100 mL of 3% hydrogen peroxide solution。

10 mL of catalase enzyme solution。

250 mL graduated cylinder。

Thermometer。

Stopwatch。

The procedure was as follows:1. The hydrogen peroxide solution was poured into the graduated cylinder.2. The catalase enzyme solution was added to the hydrogen peroxide solution.3. The stopwatch was started.4. The volume of oxygen produced was recorded every minute for 10 minutes.5. The temperature of the solution was recorded everyminute for 10 minutes.Results。

英语作文实验报告

英语作文实验报告Yesterday, we conducted an experiment in the lab totest the effects of different temperatures on the growth of plants. The goal was to observe how plants react to extreme temperatures and whether they can adapt to survive in harsh conditions.The experiment started by planting seeds in separate pots and placing them in different temperature-controlled environments. Some pots were kept in a room with normal room temperature, while others were placed in a freezer or a heated room. We wanted to see if the plants would grow differently depending on the temperature they were exposed to.After a week of observation, we found that the plants in the normal room temperature environment grew the best. They had healthy green leaves and strong stems. On the other hand, the plants in the freezer environment wilted and died, unable to withstand the extreme cold. The plantsin the heated room also struggled to grow, with yellow leaves and stunted growth.Overall, the experiment showed us the importance of maintaining a stable temperature for plant growth. Extreme temperatures can have a negative impact on plants, affecting their ability to photosynthesize and grow. It is crucial to provide plants with the right conditions to ensure their survival and well-being.In conclusion, this experiment provided valuable insights into the effects of temperature on plant growth. It highlighted the need for careful monitoring and control of environmental conditions to support healthy plant development. By understanding how plants respond to different temperatures, we can better protect and nurture them in various settings.。

实验报告英语作文高一范文

实验报告英语作文高一范文Title: Experiment Report: Investigating the Effect of Temperature on the Rate of Sugar Dissolving in WaterIntroduction:In this experiment, we aimed to investigate the effect of temperature on the rate at which sugar dissolves in water. Dissolution is a physical process where a solid substance breaks down into smaller particles and becomes uniformly distributed in a liquid or gas. It is well known that temperature plays a significant role in the rate of chemical and physical reactions, including dissolution. By varying the temperature of the water and observing the time taken for a fixed amount of sugar to dissolve completely, we hoped to gain insight into this phenomenon.Materials:Four identical beakers or test tubesMeasuring cylinderSugar (granulated, same brand and batch for consistency)ThermometerHot plate or microwave (for heating water)Ice cubes (for cooling water)StopwatchStirring rodProcedure:Preparation: Measure out equal volumes of tap water (e.g., 100 mL) into each of the four beakers. Label them as "Cold," "Room Temperature," "Warm," and "Hot."Temperature Adjustment:For the "Cold" beaker, add a few ice cubes and stir until the desired temperature (around 5°C) is reached.Leave the "Room Temperature" beaker as is.Heat the water in the "Warm" beaker using a hot plate or microwave until it reaches approximately 40°C, using a thermometer to monitor the temperature.Similarly, heat the water in the "Hot" beaker to approximately 70°C.Sugar Addition: Using the measuring cylinder, add the same amount of sugar (e.g., 10 grams) to each beaker.Observation and Timing:Simultaneously start the stopwatch for all four beakers.Stir each beaker gently and continuously with astirring rod to ensure even mixing.Observe and record the time it takes for the sugar to completely dissolve in each beaker. This is when no visible sugar grains remain and the solution appears clear.Data Recording: Record the temperature and corresponding dissolution time for each beaker.Results:Based on our observations, we found that the hotter the water, the faster the sugar dissolved. Specifically:Cold (5°C): Dissolution time = approximately 5 minutes Room Temperature (25°C): Dissolution time = approximately 3 minutesWarm (40°C): Dissolution time = approximately 1 minute 30 secondsHot (70°C): Dissolution time = approximately 45 secondsDiscussion:The results clearly demonstrate that an increase intemperature accelerates the rate of sugar dissolution in water. This can be explained by the kinetic theory of matter, which states that at higher temperatures, particles move faster and collide more frequently. In the case of dissolution, the faster-moving water molecules collide more vigorously with the sugar particles, breaking down the larger sugar crystals into smaller soluble particles more rapidly.Conclusion:In conclusion, our experiment successfully demonstrated that the rate of sugar dissolving in water is positively correlated with the temperature of the water. Higher temperatures lead to faster dissolution, supporting the kinetic theory of matter. This understanding has practical applications in various fields, such as food processing, pharmaceutical manufacturing, and laboratory procedures where controlled dissolution rates are crucial.。

化学实验报告英语作文(3篇)

第1篇Experiment Name: Preparation of Sodium Chloride from SaltwaterDate: [Date]Objective: The objective of this experiment was to prepare sodium chloride from saltwater by the process of evaporation and crystallization.Introduction:Saltwater is a mixture of water and sodium chloride (NaCl), which is commonly found in oceans, seas, and lakes. The concentration of sodium chloride in saltwater can vary, but it is typically around 3.5% by weight. The process of evaporation and crystallization is used to separate sodium chloride from saltwater and obtain pure sodium chloride crystals.Materials:- Saltwater- Evaporating dish- Bunsen burner- Glass stirring rod- Weighing balance- Filter paper- Funnel- Beaker- Test tube- Microscope- Sodium chloride crystals (for comparison)Procedure:1. Measure 100 mL of saltwater using a graduated cylinder and transfer it to an evaporating dish.2. Place the evaporating dish on a hot plate and heat it using a Bunsen burner. Stir the saltwater continuously with a glass stirring rod to prevent localized boiling and ensure even evaporation.3. Observe the evaporation process until the saltwater is reduced to a small volume, approximately 20 mL. At this point, the concentration of sodium chloride has increased significantly.4. Remove the evaporating dish from the hot plate and allow it to cool down to room temperature.5. Once the evaporating dish is cool, observe the crystallization process. Sodium chloride crystals will start to form as the solution cools down.6. Use a filter paper and funnel to collect the sodium chloride crystals from the evaporating dish. Wash the crystals with distilled water to remove any impurities.7. Transfer the sodium chloride crystals to a beaker and dry them usinga Bunsen burner. Allow the crystals to cool down to room temperature before weighing them.8. Compare the weight of the sodium chloride crystals obtained from the experiment with the known weight of sodium chloride crystals (for comparison).Results:- Initial weight of the sodium chloride crystals: [Weight]- Weight of the sodium chloride crystals obtained from the experiment: [Weight]- Known weight of sodium chloride crystals (for comparison): [Weight]Discussion:In this experiment, we successfully prepared sodium chloride from saltwater using the process of evaporation and crystallization. As the saltwater was heated, the water evaporated, leaving behind the sodium chloride crystals. The concentration of sodium chloride in the saltwater increased as the water evaporated, leading to the formation of crystals. The purity of the sodium chloride crystals was determined by comparing the weight of the obtained crystals with the known weight of sodium chloride crystals.The experiment demonstrated the effectiveness of the evaporation and crystallization process in separating sodium chloride from saltwater. However, it is important to note that the purity of the obtained sodium chloride crystals can be affected by various factors such as impurities in the saltwater and the conditions of evaporation and crystallization.Conclusion:The objective of this experiment was achieved by successfully preparing sodium chloride from saltwater using the process of evaporation and crystallization. The obtained sodium chloride crystals were compared with the known weight of sodium chloride crystals, and the experiment was found to be successful in obtaining pure sodium chloride. Further optimization of the experimental conditions could potentially improve the purity of the obtained sodium chloride crystals.第2篇Experiment Title: Synthesis of Ethanol from EtheneDate: October 15, 2023Objective: The objective of this experiment was to synthesize ethanol from ethene using the hydration reaction. The experiment aimed to demonstrate the principles of chemical reactions, the use of laboratory equipment, and the application of safety protocols.Materials:- Ethene (C2H4)- Concentrated sulfuric acid (H2SO4)- Water (H2O)- Sodium chloride (NaCl) solution- Potassium dichromate (K2Cr2O7) solution- Iron (III) chloride (FeCl3) solution- Ethanol (C2H5OH) standard solution- Chloroform (CHCl3)- Distillation apparatus- Gas burner- Test tubes- Beakers- Pipettes- Thermometer- Stirring rod- Safety goggles- Lab coat- GlovesProcedure:1. Preparation of Ethene Solution:- Ethene was passed through a column filled with sodium chloride solution to remove impurities.- The purified ethene was collected in a test tube.2. Hydration Reaction:- A beaker containing concentrated sulfuric acid was heated gently.- The ethene was then passed through the hot sulfuric acid, where it underwent hydration to form ethanol.- The resulting solution was allowed to cool.3. Purification of Ethanol:- The mixture was separated using a separating funnel to remove unreacted ethene and sulfuric acid.- The organic layer, containing ethanol, was collected in a clean beaker.4. Confirmation of Ethanol Formation:- A small amount of the organic layer was mixed with potassium dichromate and iron (III) chloride solutions.- A color change indicated the presence of alcohol, confirming the formation of ethanol.5. Distillation:- The organic layer was transferred to a distillation apparatus.- Ethanol, with a boiling point of 78.37°C, was distilled off a nd collected in a receiver.6. Analysis:- The purity of the distilled ethanol was determined using a gas chromatograph.- The yield of ethanol was calculated based on the initial amount of ethene used.Results:- Ethanol Formation:- The reaction mixture turned yellow upon addition of potassium dichromate and iron (III) chloride, indicating the presence of alcohol.- Distillation:- The distillation process yielded approximately 50 mL of ethanol, corresponding to a yield of 40%.- Gas Chromatography:- The gas chromatography analysis confirmed the purity of the ethanol to be 95%.Discussion:The experiment successfully synthesized ethanol from ethene through the hydration reaction. The use of concentrated sulfuric acid as a catalyst facilitated the reaction, and the distillation process allowed for the separation of pure ethanol. The yield of 40% was reasonable, considering the limitations of the experimental setup and the potential for side reactions. The purity of the ethanol, as determined by gas chromatography, was satisfactory, indicating a successful synthesis.Conclusion:This experiment provided a practical demonstration of the hydration reaction and the synthesis of ethanol from ethene. The use of laboratory techniques and safety protocols was crucial in ensuring the success of the experiment. The results indicate that the synthesis of ethanol is a feasible process, and further optimization could potentially increase the yield and purity of the product.Safety Precautions:- All chemicals were handled with care, and appropriate personal protective equipment, including safety goggles, lab coat, and gloves, was worn at all times.- Concentrated sulfuric acid and other hazardous chemicals were handled using proper techniques to avoid spills and inhalation of vapors.- The gas burner was used with caution, and the distillation apparatus was securely fastened to prevent any accidents.References:- Smith, J. M. (2020). Introduction to Organic Chemistry. New York: Oxford University Press.- Johnson, R. L. (2019). Principles of Chemical Engineering. Boston: McGraw-Hill Education.第3篇Experiment Title: Synthesis of Silver NitrateDate: [Date]Time: [Time]Lab Section: [Lab Section]Lab Partner: [Partner's Name]Abstract:The objective of this experiment was to synthesize silver nitrate by reacting silver with concentrated nitric acid. The experiment aimed to understand the chemical reaction involved, the properties of the products, and the safety precautions associated with the use of hazardous chemicals.Introduction:Silver nitrate is a compound with the chemical formula AgNO3. It is a white crystalline solid that is highly soluble in water. Silver nitrate is used in various applications, including photography, medicine, and the preparation of other silver compounds. In this experiment, we synthesized silver nitrate by reacting silver with concentrated nitric acid.Materials:- Silver metal (shiny silver coins or pellets)- Concentrated nitric acid (HNO3)- Distilled water- Test tubes- Beakers- Glass rods- Safety goggles- Lab coat- Gloves- Bunsen burner- Heat sourceProcedure:1. Wear safety goggles, lab coat, and gloves to ensure personal safety.2. Measure 2-3 silver coins or pellets and place them in a test tube.3. Add 2-3 mL of concentrated nitric acid to the test tube containing the silver.4. Observe the reaction. The silver will react with the nitric acid to form a brown gas (NO2) and a white precipitate (silver nitrate).5. Continue adding concentrated nitric acid to the reaction mixture until the precipitate stops forming.6. Allow the reaction mixture to cool to room temperature.7. Once cooled, carefully add 10 mL of distilled water to the test tube.8. Stir the solution with a glass rod to dissolve the silver nitrate.9. Transfer the solution to a beaker and heat it gently over a Bunsen burner to remove any remaining nitric acid fumes.10. Once the fumes have dissipated, allow the solution to cool to room temperature.11. Transfer the solution to a clean, labeled container for storage.Results:The reaction between silver and concentrated nitric acid produced a white precipitate, which was identified as silver nitrate. The solution turned light brown due to the formation of nitrogen dioxide gas (NO2). The precipitate was observed to be insoluble in water.Discussion:In this experiment, the reaction between silver and concentrated nitric acid was a single displacement reaction. The silver atoms replaced the hydrogen atoms in the nitric acid, forming silver nitrate and nitrogen dioxide gas. The balanced chemical equation for the reaction is:2Ag(s) + 4HNO3(aq) → 2AgNO3(aq) + 2NO2(g) + 2H2O(l)The white precipitate observed was silver nitrate, which is a sparingly soluble salt. The light brown color of the solution was due to the formation of nitrogen dioxide gas, which is a colorless gas under normal conditions but turns brown when dissolved in water.Conclusion:The experiment successfully synthesized silver nitrate by reactingsilver with concentrated nitric acid. The reaction produced a white precipitate, which was identified as silver nitrate. The experiment demonstrated the principles of single displacement reactions and the properties of silver nitrate. It also emphasized the importance of safety precautions when handling hazardous chemicals.References:1. Chang, R. (2016). Chemistry. 13th ed. New York, NY: McGraw-Hill Education.2. Silberberg, M. S. (2016). Chemistry: The Central Science. 14th ed. New York, NY: McGraw-Hill Education.。

简单的实验报告英语作文

简单的实验报告英语作文Experimental Report: The Effect of Temperature on the Rate of Enzyme Activity。

Introduction。

Enzymes are proteins that catalyze biochemicalreactions in living organisms. They play a crucial role in many biological processes, such as digestion, metabolism, and cellular respiration. Enzyme activity is affected by various factors, including temperature, pH, substrate concentration, and enzyme concentration. In this experiment, we investigated the effect of temperature on the rate of enzyme activity using the enzyme lactase and the substrate lactose.Materials and Methods。

Materials:Lactase solution。

Lactose solution。

Test tubes。

Thermometer。

Water bath。

Timer。

Spectrophotometer。

Methods:1. Prepare lactase solution by diluting 1 mL of lactase stock solution with 9 mL of distilled water.2. Prepare lactose solution by dissolving 1 g of lactose in 100 mL of distilled water.3. Label six test tubes as follows: 0°C, 20°C, 30°C, 40°C, 50°C, and 60°C.4. Add 2 mL of lactase solution to each test tube.5. Place the test tubes in a water bath at the designated temperature for 5 minutes to equilibrate.6. Add 2 mL of lactose solution to each test tube and start the timer.7. Mix the contents of each test tube by gently swirling.8. After 1 minute, remove 1 mL of the reaction mixture from each test tube and transfer it to a spectrophotometer cuvette.9. Measure the absorbance of each sample at 540 nm using a spectrophotometer.10. Repeat steps 8-9 every minute for 5 minutes.11. Record the absorbance values in a table and calculate the average rate of enzyme activity for each temperature.Results。

英文实验报告范例

Lab2 Report1.Experiment setup:a)Breadboard:The circuit is setup according to the circuit diagrams in the specification.b)Measurement setup:1)Signal generator:Depending on different part of the experiment, the TTL and 50Ωoutput of the signalgenerator will be used.2)Power supply:The SN74LS00 chip requires a constant V CC of 5V. Therefore, the constant 5V outputterminals on the front right of the power supply are used to supplied the voltage. In laterstages, the adjustable supply terminals will be used to power the 74HC00 CMOS logicgate.3)CRO:CH1 of the CRO is used to take input from the signal generator or the power supply,while CH2 is used to take the output of the circuit. Waveforms in both channels aremonitored on the same screen in order to investigate the characteristics of the circuit.Depending on different part of the experiment, AC/DC coupling is used for eachchannel.2.Measurements:a)Power supply decoupling:1)The input signal to the circuit is taken from the TTL output from the signal generatorwith a frequency of 1kHz. CH1 of the CRO is used to measure the V CC with ACcoupling set. Waveforms in CH1 and CH2 are shown in Figure 1.Figure 1 No capacitor is connectedAs seen from the figure above, although the power supply should output a DCwaveform ideally, the output of the power supply contains decaying sinusoidalwaveform. The maximum voltage dip is 1.48V. This short-term reduction in the supplyis caused by the rapid voltage level change at the output of the TTL gate.2)The setup of the experiment is kept the same except for connecting a 100nF loadcapacitor between the output of the chip and GND. The waveforms displayed on theCRO is shown by the following figure.Figure 2 A load capacitor is connected at the outputThe load capacitor represents the total input impedances of all other logic gatesconnected to the output of this logic gate, which in turn gives a measure of the fan-out ofthe gate. After connecting the load capacitor, the voltage dip has increased to 2.10V.While the capacitor is charging up, it draws a lot current from the output of the chip.This causes the supply voltage to reduce to maintain the supply power constant.3)Connect a capacitor of 100nF across the V CC and GND while keeping the rest of thecircuit the same as the previous steps. After connecting the power supply decouplingcapacitor, the waveform of the power supply is recorded in the following figure.Figure 3 Decoupling capacitor is connectedIn comparison with the first case where there is no capacitor connected between V CCand GND, the decaying sinusoid is smoothened quiet a lot. The capacitor charges upwhen is supply voltage is stable and discharges to stablise the supply voltage level whenthe supply voltage undergoes a dip.b)Propagation delay:1)With load capacitor at the output:The low-to-high propagation delay is the change in time measured between the point halfway of the falling edge of the input signal and the point halfway of the corresponding rising edge of the output signal. The measurement is done using the cursor function of the CRO.Figure 4 Propagation delay with load capacitorThe low-to-high propagation delay specified in the data sheet for the 74LS00 chip is4.5ns under the condition of a load capacitor of 50pF. The capacitor we use is 100nFwhich is 2000 times of the value used in the data sheet. Then the expected value of t LHwould be 9μs. The measured value from the CRO is 10.4μs which is quite close to the expected value. The slight discrepancy maybe due to the capacitance present in the breadboard and wires. Since the measured value is very close to the expected value, it is still consistent with the datasheet.2)Without the load capacitor:Figure 5 Propagation delay without load capacitorAs the figure indicates that the propagation delay in this case is 16ns. When there is no load capacitor connected at the output of the chip, the transient time of the output waveform is reduced by a considerable amount. The propagation delay specified in the datasheet is in the range of 3 to 4.5ns under the test condition of R L=280ΩandC L=15pF. The discrepancy in the measured propagation delay could be due to thedifference in the test condition. However, the behavior of the output in this case is within expectation and thus consistent.c)Noise margins:The signal generator is set to produce a triangular waveform of 1kHz, with minimum voltage of 0V and maximum voltage at 5V. The output waveform is displayed on the CRO’s screen asshown in the Figure 7 and 8. Cursor function is used to measure the V IL,V IH,V OL and V OH. The V IH and V IL are measured to be 1.04V and 0.76V respectively, as shown in Figure 8 and 9. V OH and V OL are 4.40V and 80mV respectively (refer to Figure 10). The noise margin of a TTL gate is define to be: NM H=V OH−V IH and NM L=V IL−V OL. The noise margin of the 74LS00 gate is:NM H=4.40−1.04=3.36VNM L=0.76−0.08=0.68VThe values of V IL and V IH specified in the data sheet are 0.8V (max) and 2V (min). The measured V IL is consistent with the data sheet though it is a little bit high. The measured V IH, however is too low compared with the specified value. The discrepancy in the value of the measured V IH may be caused by that the datasheet is conservative on this value.The values of V OH and V OL specified in the data sheet are 2.7V (min), 3.4 (typical) and 0.5V (max) respectively. Those values measured from the experiment are within the range of specification and thus consistent with the data sheet.Figure 6 Output waveform Figure 7 Measure of V IHFigure 8 Measure of V ILVoltage transfer characteristics:The equipment settings and circuit are kept the same as the previous step except for CH2. The X-Y setting is used instead of T-Y in order to show how v OUT changes with v SIG. Figure 9 shows the final result of this part in the experiment. When the signal voltage is low, the output voltage is high and the converse. The graph shows that v OUT is decreasing as v SIG increases. Furthermore, there is a sudden drop in v OUT when v SIG is equal to the switching voltage. This is within our expectation. Therefore, the graph below is consistentwith the physical operation of the chip.Figure 9 V oltage transferd) Input and output characteristics:Part (a):Build up the circuit as shown in the following circuit diagram. The 1kΩ resistor is crucial in this case as it limits the current flow into the gate. The signal generator is set to produce a triangular wave of 1kHz with maximum voltage of 8V and minimum voltage of −4V . CH1 and CH2 are used to measure the voltage across the resistor at the output of the chip. The MATH function of the CRO is then used to calculate the potential difference across the resistor. The relation between i OUT and v IN is shown in the graph below.Figure 10 Figure11 V INR −V INFigure 12 Figure 13 V OUTR −V OUTPart (b)The circuit is setup according to Figure 12. The CRO, signal generator and power supply settings are kept unchanged. The experimental procedure is similar to that in part (a). The relationship between i OUT and v OUT is shown in the following graph. At either end of the graph, current is increasing dramatically with minimal increase/degrees of v OUT . This is dure to the diodes at the input and output sides of the chip. They are able to clamp the voltage at a stable level by draining a lot of current. Therefore the shape of the graph is consistent with the behavior of the chip.e) Low-voltage CMOS logic:Set up the circuit with the 74HC00 chip according to Figure 14 on the breadboard. The input signal to the circuit from the signal generator is a square wave at 1kHz with maximum and minimum voltages of 2 and 0volts. This can be achieved by adjusting the offset of the generator appropriately. Start the experiment with the supply voltage V CC =2V and gradually reduce it to find the point where the chip is not outputting a correct logic level.Figure 14 Figure 15 74HC00 correctly operatingWhen the supply voltage is at 2V, the output waveform is shown in Figure 15. As the blue trace (output logic measured by CH2) suggested that the chip is functioning correctly with a supply voltage of 2V.However, if we carefully reduce the supply voltage, until a distorted output logic is seen on the screen. The output waveform is shown in the Figure 16.Figure 16 74HC00 logic output distortedV CC is measured to be 0.9V at this instance. The output logic is not a square wave anymore.The data sheet for 74CH00 specifies that the operating voltage is between 2-6V. 0.9V is out of this range and the chip may not operate as we expected. Thus, the measured value is consistent with the data sheet.When V CC gets quiet low, the output waveform almost collapse into a flat line, except some fluctuations on it. When the supply voltage gets quiet low, the CMOS chip is not turned on and therefore the output logic state is incorrect. The fluctuations may be the noise in the components detected by the CRO.f)Interfacing CMOS and TTL:In Figure 23, a BJT is used to interface the CMOS and TTL gates. The circuit is basically a cascade of NAND gates to invert the input signal. At the first stage of the circuit, the CMOS gate inverts the input signal. Since the CMOS gate is operating at 1V supply voltage, outputlogic high will be 1V and 0V for logic low.The BJT is acting as an open collector which switches the output voltage between V CC and GND. When the output voltage of the CMOS gate is high (1V), current flows into the base of the transistor, the collector voltage will be pulled down to GND. This is because of the fact that the BJT is in its saturation mode. When the output voltage of the CMOS is low, no current flows into the base terminal, then the collector voltage will be pulled up to V CC=5V.The BJT is in its cut-off region in this case. Therefore the BJT pulls up the output logic high voltage level to V CC in order to better drive the TTL gate in the next stage of the circuit.The circuit is setup on the breadboard according to the circuit diagram in Figure 20. The supply voltage to the COMS gate is 1V while 5V for BJT and TTL. The output voltage at each stage of the circuit is measured by CH2 of the CRO. By investigating the output waveforms in Figure 17 to 19, it is concluded that the explanation of the operation of the circuit is consistent with the actual experimental result.Figure 17 Output of CMOS Figure 18 Output of BJTFigure 19 Output of TTL Figure 20 Interfacing CMOS and TTL 3.Conclusion:In this experiment, we have investigated the fan-out, propagation delay, noise margins and I/O characteristics of a TTL gate. Apart from a few discrepancies, the result is consistent with the specified values in the datasheet. A CMOS logic gate is investigated for its low-voltage performance and CMOS-TTL interface. The experiment result demonstrates that the CMOS gate has a much better power rating as compared to TTL gates. A pull-up circuit such as the open collector switch is required to interface the two. This experiment successfully demonstrates the important features and behaviors of TTL, CMOS gates and their interface.。

实验报告成功英语作文

实验报告成功英语作文Experiment Report: Success。

Paragraph 1:Wow, what a day! I can't believe our experiment was such a success. We were all so excited and nervous before we started, but now we can finally relax and celebrate. It feels great to see all our hard work pay off. 。

Paragraph 2:The experiment itself was quite challenging. We had to come up with a unique hypothesis and design the setup from scratch. It took us days of brainstorming and researching to finalize our plan. But in the end, it was all worth it.Paragraph 3:The most thrilling part was conducting the experiment.We had to be extremely careful and precise with our measurements and observations. It felt like we were on a mission, trying to gather all the data we needed. The adrenaline rush made it even more exciting.Paragraph 4:Of course, there were a few setbacks along the way. We encountered some technical difficulties that delayed our progress. It was frustrating at times, but we didn't let it discourage us. We persevered and found solutions to overcome the obstacles.Paragraph 5:The data analysis was a crucial step in determining the success of our experiment. We spent hours crunching numbers, making graphs, and interpreting the results. It was fascinating to see how everything came together and supported our hypothesis.Paragraph 6:The moment of truth came when we presented our findings to our peers and mentors. We were all anxious to hear their feedback and opinions. It was nerve-wracking, but their positive response and appreciation made it all worthwhile.Paragraph 7:Looking back at this whole experience, I feel a senseof accomplishment. It was not just about the success of the experiment, but also about the personal growth and teamwork that came along with it. We learned so much from each other and developed valuable skills.Paragraph 8:In conclusion, this experiment was a resounding success. It taught us the importance of perseverance, teamwork, and attention to detail. We are proud of what we achieved and excited to continue exploring new ideas and conducting more experiments in the future.。

英语作文鸡蛋实验报告

英语作文鸡蛋实验报告Well, this experiment with eggs was pretty interesting!I started by getting a few eggs from the fridge and placing them in a bowl of water. I wanted to see if they wouldfloat or sink. Guess what? They all sank to the bottom! I was a bit surprised.Then I decided to take one of the eggs and try to make it float. I filled another bowl with saltwater andcarefully placed the egg in. Slowly, it started to rise to the surface. It was so cool! The saltwater must have changed the density or something.Next, I wanted to see what would happen if I tried to spin the eggs. I put one on a flat surface and gave it a gentle spin. It just kind of rolled around in circles. But when I tried spinning the egg that had been in saltwater,it spun really fast and smoothly. I guess the saltwater must have changed the inside of the egg somehow.After that, I decided to boil one of the eggs. As it cooked, I noticed the shell changing color and getting harder. When I peeled it, the inside was firm and yellow. I compared it to the raw egg and they were totally different. It was amazing how heat could change an egg so much.Finally, I decided to try breaking an egg into a pan and cooking it. As I watched it cook, I could see the yolk starting to firm up and the white getting all puffy. The smell was incredible! I knew I had to taste it. It was delicious!。

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