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 bunn burner when it is not being ud
C. to dilute an acid , 幼师自我鉴定slowly pour water into it
D. know where the first aid equipment is stored
E. u 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℃)? ( )
赞美虎的诗句 A. 6 B. 12 C. 60 D. 120 E. 600
4. Which of the following combinations reprents 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
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E. number of neutrons
6. Write the IUPAC and common names of each compound below.
a. CH3CH2OH ________________________ ________________________
b. HCHO ________________________ ________________________
c. CH3COOH _______________________ ________________________做梦哭了
d. (CH3)2CO ________________________ ________________________
7. Write a chemical equation for the dissociation of each of the following acids and bas in water.
a. nitric acid ___________________________________________
b. ethanoic acid __________________________________________企业外包
c. ammonia ____________________________________________男人怎么撒娇
d. magnesium hydroxide __________________________________
8. 鳝Calculate: How many moles of HCl are required to neutralize aqueous solutions of the bas?
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 AgNO3 is mixed with 500mL of a 0.001M solution of NaCl? Explain.
10. Describe : How can you u a balanced chemical equation to write an equilibrium constant expression?
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