CHM 120
Exam 2: Chapters 5,6,7,8
Exam 2
Total Points: 60
PART 1: Multiple Choice questions: Q 1-24. (2 point each)
1. In balancing chemical equations, the coefficients are used to
a. Show number of moles
b. Show volume of each in liters
c. Show amount of each in grams
d. Show temperature at which the substance is stable
2. 2H2 + O2 2H2O means that
a. 2 grams of H2 g and 1 gram of O2 gas combine to form 2 grams of water.
b. 2 moles of H2 g and 1 mole of O2 gas combine to form 2 moles of water.
c. 2 grams of H2 g and 1 gram of O2 gas combine to form 2 moles of water.
d. 2 molecules of H2 g and 1 molecule of O2 gas combine to form 2 molecules of water.
3. Chemical reactions (equations) show the following
a. Reactants
b. Products
c. Physical state of each (gas or liquid or solid)
d. All of the above
4. The following is true for a mole
a. It is also known as Avagadro’s number
b. It contains 6.022 * 1023 molecules
c. It contains mass equivalent to molecular weight
d. All of the above are true
5. 2H2 + O2 2H2O. In this equation, correct method to calculate molecular mass of
water is
a. 2[2(mass of hydrogen) + mass of oxygen]
b. 2(mass of hydrogen gas) + mass of oxygen gas
c. 2(mass of hydrogen) + mass of oxygen
1
This study source was downloaded by 100000864049005 from CourseHero.com on 03-16-2023 03:00:30 GMT -05:00
https://www.coursehero.com/file/38966175/Exam-2-AnswerKeypdf/
, CHM 120
Exam 2: Chapters 5,6,7,8
6. One mole of O2 gas contains ___________ number of molecules.
a. 32 Grams
b. 1
c. 6.02 * 1023
d. None of the above
7. Concentration of a solution is
a. Amount of solute dissolved in given amount of solvent
b. Amount of solute dissolved in 1 L of solvent
c. 1 g of solute dissolved in given amount of solvent
d. A mass equivalent to Molecular weight of solute dissolved in given amount of solvent
8. The following is a product of reaction of a nonmetal oxide with water to make acid. a. C6H12O6
b. H2CO3
c. NH4OH
d. CO2
9. If CaO reacts with water, the following product will be made.
a. Ca
b. CaOH
c. Ca(OH)2
d. H2Ca
10. The following will be made when KOH reacts with HCl.
a. KH
b. KCl
c. H2O
d. B & c are true
11. “The neutralization reaction is a quantitative reaction, where amount of acid needed to
neutralize the base can be accurately calculated.” This statement is
a. True
b. False
12. The pH scale represents the
a. acidity of a solution
b. whether the acid is strong acid or weak Commented [SM1]: I will accept a or b as correct answer
2
c. amount of salt
d. all of the above
13. Buffer solution is a solution
a. With constant concentration
b. With constant pH
c. Of weak base
d. All of the above
This study source was downloaded by 100000864049005 from CourseHero.com on 03-16-2023 03:00:30 GMT -05:00
https://www.coursehero.com/file/38966175/Exam-2-AnswerKeypdf/
Exam 2: Chapters 5,6,7,8
Exam 2
Total Points: 60
PART 1: Multiple Choice questions: Q 1-24. (2 point each)
1. In balancing chemical equations, the coefficients are used to
a. Show number of moles
b. Show volume of each in liters
c. Show amount of each in grams
d. Show temperature at which the substance is stable
2. 2H2 + O2 2H2O means that
a. 2 grams of H2 g and 1 gram of O2 gas combine to form 2 grams of water.
b. 2 moles of H2 g and 1 mole of O2 gas combine to form 2 moles of water.
c. 2 grams of H2 g and 1 gram of O2 gas combine to form 2 moles of water.
d. 2 molecules of H2 g and 1 molecule of O2 gas combine to form 2 molecules of water.
3. Chemical reactions (equations) show the following
a. Reactants
b. Products
c. Physical state of each (gas or liquid or solid)
d. All of the above
4. The following is true for a mole
a. It is also known as Avagadro’s number
b. It contains 6.022 * 1023 molecules
c. It contains mass equivalent to molecular weight
d. All of the above are true
5. 2H2 + O2 2H2O. In this equation, correct method to calculate molecular mass of
water is
a. 2[2(mass of hydrogen) + mass of oxygen]
b. 2(mass of hydrogen gas) + mass of oxygen gas
c. 2(mass of hydrogen) + mass of oxygen
1
This study source was downloaded by 100000864049005 from CourseHero.com on 03-16-2023 03:00:30 GMT -05:00
https://www.coursehero.com/file/38966175/Exam-2-AnswerKeypdf/
, CHM 120
Exam 2: Chapters 5,6,7,8
6. One mole of O2 gas contains ___________ number of molecules.
a. 32 Grams
b. 1
c. 6.02 * 1023
d. None of the above
7. Concentration of a solution is
a. Amount of solute dissolved in given amount of solvent
b. Amount of solute dissolved in 1 L of solvent
c. 1 g of solute dissolved in given amount of solvent
d. A mass equivalent to Molecular weight of solute dissolved in given amount of solvent
8. The following is a product of reaction of a nonmetal oxide with water to make acid. a. C6H12O6
b. H2CO3
c. NH4OH
d. CO2
9. If CaO reacts with water, the following product will be made.
a. Ca
b. CaOH
c. Ca(OH)2
d. H2Ca
10. The following will be made when KOH reacts with HCl.
a. KH
b. KCl
c. H2O
d. B & c are true
11. “The neutralization reaction is a quantitative reaction, where amount of acid needed to
neutralize the base can be accurately calculated.” This statement is
a. True
b. False
12. The pH scale represents the
a. acidity of a solution
b. whether the acid is strong acid or weak Commented [SM1]: I will accept a or b as correct answer
2
c. amount of salt
d. all of the above
13. Buffer solution is a solution
a. With constant concentration
b. With constant pH
c. Of weak base
d. All of the above
This study source was downloaded by 100000864049005 from CourseHero.com on 03-16-2023 03:00:30 GMT -05:00
https://www.coursehero.com/file/38966175/Exam-2-AnswerKeypdf/
