美国高中化学测试题
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1. All of the following are safe laboratory practices EXCEPT _____. ( )
A. never place a container of liquid on a piece of electrical equipment
B. turn off a bunsen burner when it is not being used
C. to dilute an acid ,slowly pour water into it
D. know where the first aid equipment is stored
E. use toxic chemicals and solvents in a fume hood
2. What is the percent composition of CO2? ( )
A. 10%C and 90%O
B. 14% C and 86% O
C. 18% C and 82%O
D. 23% C and 77% O
E. 27% C and 73% O
3. 10g of liquid at 300K are heated to 350K. The liquid absorbs 6kcals. What is the specific heat of the liquid (in cal/g℃)? ( )
A. 6
B. 12
C. 60
D. 120
E. 600
4. Which of the following combinations represents an element with a net charge of +1 with a mass number of 75 ? ( )
A. 35 neutrons, 35 protons, 34 electrons
B. 40 neutrons, 40 protons, 39 electrons
C. 40 neutrons, 35 protons, 34 electrons
D. 37 neutrons, 38 protons, 39 electrons
E. 40 neutrons, 35 protons, 35 electrons
5. The modern periodic table is ordered on the basis of _____ ( )
A. atomic mass
B. atomic radius
C. atomic charge
D. atomic number
E. number of neutrons
6. Write the IUPAC and common names of each compound below.
a. CH3CH2OH ________________________ ________________________
b. HCHO ________________________ ________________________
c. CH3COOH _______________________ ________________________
d. (CH3)2CO ________________________ ________________________
7. Write a chemical equation for the dissociation of each of the following acids and bases in water.
a. nitric acid ___________________________________________
b. ethanoic acid __________________________________________
c. ammonia ____________________________________________
d. magnesium hydroxide __________________________________
8. Calculate: How many moles of HCl are required to neutralize aqueous solutions of these bases?
a. 0.03 mol KOH __________________________
b. 2 mol NH3__________________________
c. 0.1 mol Ca(OH)2 __________________________
9. Predict :Will a precipitate form when 500mL of a 0.02M solution of AgNO3is mixed with 500mL of a 0.001M solution of NaCl? Explain.
10. Describe: How can you use a balanced chemical equation to write an equilibrium constant expression?