Question 1

Consider the reaction 2ZnS + 3O2 → 2ZnO + 2SO2. Suppose that you wanted enough O2 to completely react with 500. g of ZnS. What mass of O2 should be present?

Question 1 options:

164 g

110 g

215 g

246 g

Question 2

Balance the following reaction with the simplest set of intergers: Fe3O4 + H2 → Fe + H2O. What is the stochiometric coefficient of H2?

Question 2 options:

1

2

3

4

Question 3

Consider the reaction Cu2S + O2 → 2Cu + SO2. If 55.0 grams of Cu2S is heated in excess O2, what is the mass of Cu that can be produced?

Question 3 options:

43.9 g

2.0 g

18.5 g

55.0 g

Question 4

Consider the reaction HgS + O2 → SO2 + Hg. If 200.0 grams of HgS reacted with 150.0 grams of O2, what is the limiting reagent?

Question 4 options:

HgS

O2

neither

not enough information

Question 5

Consider the reaction 2KNO3 + 10K → 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent?

Question 5 options:

KNO3

K

neither

not enough information

Question 6

Balance the following reaction with the simplest set of intergers: H2O + KO2 → KOH + O2. What is the stochiometric coefficient of O2?

Question 6 options:

1

2

3

4

Question 7

Which of the following reactions is not balanced?

Question 7 options:

P4 + 3O2 → P4O6

Cu(NO3)2 → CuO + 2NO2 + O2

2Al2O3 + 3C + 6Cl2 → 4AlCl3 + 3CO2

3PbO + 2NH3 → 3Pb + N2 + 3H2O

Question 8

If equal masses of N2 and H2 (7.00 grams each) are combined to produce ammonia NH3, how many grams of ammonia could be produced at maximum yield?

N2 + 3 H2 ---> 2 NH3

Question 8 options:

3.97 g

7.00 g

14.00 g

8.50 g

4.25 g

Question 9

A synthetic organic chemist wants to make 100.0 grams of benzoyl chloride C7H5OCl from benzoic acid C7H6O2 in the following reaction. How many grams of benzoic acid will be required?

C7H6O2 + SOCl2 ---> C7H5OCl + SO2 + HCl

Question 9 options:

96.45 g

100.0 g

115.1 g

86.88 g

Question 10

How many grams of O2 are required to completely oxidize 100.0 grams of Fe in the following chemical reaction?

4 Fe + 3 O2 ---> 2 Fe2O3

Question 10 options:

57.28 g

42.97 g

76.37 g

21.48 g

75.0 g

Question 11

How many grams of Cl2 are required to completely react with 2.0 grams of H2 in the following chemical reaction?

H2 + Cl2 ---> 2 HCl

Question 11 options:

70.0 g

35.45 g

2.0 g

4.0 g

140.0 g

Question 12

Balance the following chemical equation with the set of smallest whole-number coefficients. What is the SUM of the coefficients?

___ K + ___ KNO3 ---> ___ K2O + ___ N2

Question 12 options:

7

8

10

18

19

Question 13

Balance the following equation.

C6H14O + O2 → CO2 + H2O

Question 13 options:

2C6H14O + 19O2 → 12CO2 + 14H2O

C6H14O + 9O2 → 6CO2 + 7H2O

C6H14O + (19/2)O2 → 6CO2 + 7H2O

2C6H14O + 18O2 → 12CO2 + 14H2O

2C6H14O + 4O2 → 2CO2 + 2H2O

Question 14

What is the coefficient of HCl when the following equation is correctly balanced?

CaCO3(s) + HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

Question 14 options:

1

2

3

4

Question 15

Balance the following equation.

Al + Cr2O3 → Al2O3 + Cr

Question 15 options:

2Al + Cr2O3 → Al2O3 + 2Cr

2Al + Cr2O3 → Al2O3 + Cr

4Al + 2Cr2O3 → 2Al2O3 + 4Cr

Al + Cr2O3 → Al2O3 + 2Cr

Question 16

Convert the following description to a balanced chemical reaction:

Gaseous hydrogen reacts with carbon monoxide to form methanol, CH3OH.

Question 16 options:

H2 + CO → CH3OH

2H2 + CO2 → CH3OH

4H + CO → CH3OH

2H2 + CO → CH3OH

Question 17

What is the coefficient of C3H8O3 when the following equation is correctly balanced?

C3H8O3 + O2 → CO2 + H2O

Question 17 options:

1

2

3

7

Question 18

If equal masses of H2 and O2 (100.0 grams each) are reacted together to produce water, how many grams of water could be produced?

Question 18 options:

47.0 g

200.0 g

892.8 g

150.0 g

112.5 g

Question 19

Which of the following is a chemical equation that accurately represents what happens when sulfur and oxygen react to form sulfur trioxide?

Question 19 options:

Sulfur and oxygen react to form sulfur trioxide.

S and O2 produce SO3.

S + O2 → SO3

2S + 3O2 → 2SO3

Question 20

Methane (CH4) burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction?

Question 20 options:

CH4 + O → H2O + CO2

CH4 + 4O → 2H2O + CO2

CH4 + O2 → H2O + CO2

CH4 + 2O2 → 2H2O + CO2

Question 21

An industrial process makes calcium oxide by decomposing calcium carbonate. Which of the following is NOT needed to calculate the mass of calcium oxide that can be produced from 4.7 kg of calcium carbonate?

Question 21 options:

the balanced chemical equation

molar masses of reactants

molar masses of products

volume of the unknown mass

Question 22

Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?

Question 22 options:

Na + Br2 → NaBr

2Na + Br2 → NaBr

Na + Br2 → 2NaBr

2Na + Br2 → 2NaBr

Question 23 (4 points)

Butane burns as shown in the chemical equation, 2C4H10 + 13O2 → 10 H2O + 8CO2. If 6 moles of butane burn, ___________ mole of carbon dioxide are produced.

Question 23 options:

Question 24

How many grams of O2 will be required to completely react with 2.43 grams of Mg metal ribbon to produce MgO? Hint: Start by writing a balanced chemical equations for the reaction.

Question 24 options:

6.40 g

3.20 g

0.80 g

1.21 g

1.60 g

Question 25

In the bromination of ethane (C2H6) reaction, one wants to produce 10.0 g of C2H5Br product. How many grams of C2H6 would be needed to react with excess Br2?

C2H6 + Br2 ---> C2H5Br + HBr

Question 25 options:

10.0 g

2.76 g

0.0917 g

5.52 g

20.0 g