生活中的化学(英语)

Chemistry in daily life

An introduction

Chemistry is a natural science, mainly search the material composition, properties, structure and changing. It is the primary methods to recognizing and rebuilding the physical world.

Our daily life is various, rich and colorful. With the improvement of people's life, more and more people prefer health, high quality life. People's basic is closely related to Chemistry. It can be said that we cannot live without chemistry.

Modern chemistry including inorganic chemistry, organic chemistry, physical chemistry, analytical chemistry and polymer chemistry.(无机化学、有机化学、物理化学、分析化学与高分子化学).

Application in the basic necessities of life

The use of iodized salt. Iodine is an essential nutritional element, long-term iodine deficiency can lead to big neck disease, intake iodized salt is the most simple, economic, effective method to treat this disease.

Iodized salt containing sodium chloride (氯化钠)and potassium iodate（碘酸钾）. Potassium iodate provide the iodine that human body needs, but the potassium iodate is not stable and easy to decompose when it is to be heated or light, thus affecting the intake of iodine. So when we cooking should pay attention to that: after adding salt we should take out the food quickly, not long time to stewed or stir fired.

Now the most convenient means of transportation is the automobile, but the car will produce a lot of exhaust emissions in the process of running. What kind of harm does car exhaust has to human health? Carbon monoxide is a colorless(无色), odorless（无臭）, tasteless（无味）, and non irritating（无刺激性）toxic gas. It with the air through the lungs into the blood circulation, combined with the hemoglobin(血红蛋白) in the blood, reducing the oxygen carrying capacity of red blood cells, effects of respiration and heart, brain function. Long term inhalation of nitrogen oxides can destroy the lung tissue(肺组织), nitrogen oxides can cause tissue hypoxia（缺氧）and injury the systemic tissue.

Nowadays, the additive is chemical synthesis that can improve food quality, prolong the preservation period of food in order to quicken food processing and increase food nutrition. For example, acidity regulator, color protecting agent, enzyme preparations, flavoring agent, anti caking agent, defoaming agent, antioxidant, bleach, leavening agent, preservative（防腐剂）, sweetener，thickener and flavor(香料).

Now although house prices rising all the way, but people still continue to struggle for the house, so the renovation of housing has become a must. After the decoration, house can produce toxic substance such as formaldehyde, benzene and radon. The World Health Organization has identified that formaldehyde is the carcinogenic（致癌的）and teratogenic(致畸形的) substances.