Download Chemistry I/IH Chapter 9 Chemical Reactions Practice Test Multiple

Chemistry I/IH Chapter 9 Chemical Reactions Practice Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
a. H.
b. 2H.
c. H2.
d. OH.
2. What is the whole number that appears in front of a formula in a chemical equation?
a. a subscript
b. a superscript
c. a ratio
d. a coefficient
3. To balance a chemical equation, it may be necessary to adjust the
a. coefficients.
b. subscripts.
c. formulas.
d. type of products.
4. According to the law of conservation of mass, the total mass of the reacting substances is
a. always more than the total mass of the products.
b. always less than the total mass of the products.
c. sometimes more and sometimes less than the total mass of the products.
d. always equal to the total mass of the products.
5. In the word equation, sodium oxide + water  sodium hydroxide, the formula for
sodium hydroxide is represented by
a. Na2OH.
b. NaOH.
c. NaO2.
d. Na2O.
6. Identify the product(s) in the equation for the reaction of methane and oxygen to yield carbon dioxide and
water.
a. methane
c. carbon dioxide
b. methane and oxygen
d. carbon dioxide and water
7. In the chemical equation 2Mg(s) + O2(g) --> 2MgO(s),
a. Mg represents the product magnesium.
c. Mg represents the reactant magnesium.
b. the reaction yields magnesium.
d. O2 represents the product oxygen gas.
8. In an equation, the symbol for a substance dissolved in water solution is followed by
a. (1).
b. (g).
c. (aq).
d. (s).
9. When the equation Fe3O4 + Al  Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
a. 3
b. 4
c. 6
d. 9
10. Which coefficients correctly balance the formula equation NH4NO2(s) N2(g) + H2O(l)?
a. 1, 2, 2
b. 1, 1, 2
c. 2, 1, 1
d. 2, 2, 2
11. Which coefficients correctly balance the formula equation CaO + H2O  Ca(OH)2?
a. 2, 1, 2
b. 1, 2, 3
c. 1, 2, 1
d. 1, 1, 1
12. What is the balanced equation for the composition of sulfur trioxide?
a. S(s) + O2(g)  SO(g)
c. 2S(s) + 3O2(g)  2SO3(s)
b. S(s) + O2(g)  SO2(g)
d. S(s) + 2O2(g)  SO42–(aq)
13. Which equation is not balanced?
a. 2H2 + O2  2H2O
c. H2 + H2 + O2  H2O + H2O
b. 4H2 + 2O2  4H2O
d. 2H2 + O2  H2O
14. The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are
a. Na2SO4 and H2O. b. NaSO4 and H2O. c. SI4 and Na2O.
d. S + O2 and Na.
15. What is the balanced equation when aluminum reacts with copper(II) sulfate?
a. Al + Cu2S  Al2S + Cu
b. 2Al + 3CuSO4  Al2(SO4)3 + 3Cu
c. Al + CuSO4  AlSO4 + Cu
d. 2Al + Cu2SO4  Al2SO4 + 2Cu
____ 16. The reaction represented by the equation Cl2(g) + 2KBr(aq)  2KCl(aq) + Br2(l) is a(n)
a. synthesis reaction.
c. single-displacement reaction.
b. decomposition reaction.
d. combustion reaction.
____ 17. In the equation 2Al(s) + 3Fe(NO3)2(aq)  3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by
a. nitrate.
b. water.
c. aluminum.
d. nitrogen.
____ 18. What is the name of a list of elements arranged according to the ease with which they undergo certain
chemical reactions?
a. reactivity list
b. reaction series
c. activity series
d. periodic list
____ 19. An element in the activity series can replace any element
a. in the periodic table.
c. above it on the list.
b. below it on the list.
d. in its group.
____ 20. If metal X is higher than metal Y in the activity series, then metal X
a. replaces ions of metal Y in a solution.
b. is replaced by metal Y in the solution.
c. will take the form of an element as a product in the reaction.
d. is less reactive than metal Y.
____ 21. Predict what happens when lead is added to nitric acid.
a. No reaction occurs.
c. Lead oxide forms.
b. Oxygen is released.
d. Hydrogen is replaced.
____ 22. Predict what happens when nickel is added to a solution of potassium chloride.
a. No reaction occurs.
c. Potassium nickel chloride forms.
b. Nickel chloride forms.
d. Hydrochloric acid forms.
Short Answer
23. Use a word equation to describe the chemical reaction that takes place when iron rusts. (Assume the charge
on the iron ion is +3).
24. When balancing a chemical equation, why must the formula subscripts remain unchanged?
Problem
25. Tell what type of chemical reaction is represented by the following formula equation. Then balance the
equation.
C2H6(g) + O2(g)
CO2(g) + H2O(l)
Chemistry IH Chapter 9 Chemical Reactions Practice Test
Answer Section
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STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.B.1.4.2
STA: SC.A.1.4.1
STA: SC.A.1.4.1
STA: SC.A.1.4.1
STA: SC.A.1.4.1
STA: SC.A.2.4.5
STA: SC.A.2.4.5
STA: SC.A.2.4.5
STA: SC.A.2.4.5
STA: SC.A.2.4.5
SHORT ANSWER
23. ANS: iron + oxygen  iron(III) oxide (rust)
OBJ: 2
STA: SC.B.1.4.2
24. ANS: Changing the subscript in a formula changes the chemical composition of the compound.
OBJ: 2
STA: SC.A.1.4.1
PROBLEM
25. ANS: combustion, 2C2H6(g) + 7O2(g)
OBJ: 1
STA: SC.A.2.4.5
4CO2(g) + 6H2O(l)