Name ______________________________ Class ___________________ Date __________________
Assessment
Chapter 8 Practice Test
Chapter: Chemical Equations and Reactions
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
_____ 1. You mix solution A with solution B in a beaker. Which of the
following observations does not help you prove that a chemical
reaction has occurred?
a. The beaker becomes warm.
b. You see gas bubble out of solution.
c. Solution A, solution B, and the mixture are all yellow.
d. None of the above; all help prove that a chemical reaction has
occurred.
_____ 2. In the reaction described by the word equation
sodium + water → sodium hydroxide + hydrogen gas
a. sodium hydroxide is a product.
b. sodium is a product.
c. water is a reactant.
d. Both (a) and (c)
_____ 3. Which of the following indicates that a chemical equation is balanced?
a. The numbers of atoms of each element are the same on both sides of
the equation.
b. All of the coefficients are the same.
c. The numbers of molecules on each side of the equation are equal.
d. The sums of the coefficients on each side of the equation are equal.
_____ 4. From a complete and correctly written chemical equation, you can
obtain the
a. chemical formulas of the reactants and products.
b. relative amounts of the reactants and products.
c. physical states of the reactants and products.
d. All of the above
_____ 5. To balance a chemical equation, you must
a. adjust the subscripts.
b. adjust the number of products.
c. adjust the number of reactants.
d. adjust the coefficients.
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Chapter Test A, continued
_____ 6. The formation of a solid product in a chemical reaction is represented
by the symbol
a. (aq).
b. (g).
c. (l).
d. (s).
_____ 7. What symbol indicates a reversible reaction?
a. ←
b. ↑
c. →
→
d. ←
_____ 8. In the expression 3CO2, the numbers 3 and 2 are, respectively,
a. a subscript and a coefficient.
b. a coefficient and a subscript.
c. two subscripts.
d. two coefficients.
_____ 9. What is the total number of molecules that is represented by the
following chemical equation?
NH4NO2 → N2 + 2H2O
a. 3
b. 4
c. 8
d. 16
_____ 10. Which equation below violates the law of conservation of mass?
a. 2H2 + O2 → 2H2O
b. KCl + Br → KBr + Cl2
c. 2Fe2O3 + 3C → 4Fe + 3CO2
d. Na2CO3 + 2HCl → 2NaCl + H2O + CO2
_____ 11. Which of the following equations represents the balanced equation for
the reaction of iron and oxygen?
a. 2Fe + O2 → Fe2O3
b. Fe + 3O2 → Fe2O3
c. 4Fe + 3O2 → 2Fe2O3
d. 3Fe + 3O2 → 2Fe2O3
_____ 12. Which coefficients correctly balance the formula equation below?
KClO3(s) → KCl(s) + O2(g)
a. 1, 1, 1
b. 1, 1, 3
c. 2, 2, 3
d. 2, 1, 1
_____ 13. Which equation is not balanced?
a. 2H2 + O2 → 2H2O
b. 4H2 + 2O2 → 4H2O
c. H2 + H2 + O2 → H2O + H2O
d. 2H2 + O2 → H2O
_____ 14. In which type of reaction do two or more compounds react to form one
product?
a. synthesis
b. decomposition
c. combustion
d. single-displacement
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Chapter Test A, continued
_____ 15. Which of the following is true regarding single-displacement reactions?
a. Only one product is formed.
b. There is only one reagent.
c. It requires oxygen.
d. One element replaces another in a compound.
_____ 16. Which of the following is true regarding double-displacement
reactions?
a. Two products are formed.
b. The ions of the two reactants must be exchanged.
c. A precipitate may form.
d. All of the above
_____ 17. A mixture of propane and oxygen react to form carbon dioxide and
water. What type of chemical reaction is this?
a. synthesis
b. decomposition
c. double-displacement
d. combustion
_____ 18. What type of chemical reaction does the following chemical equation
represent?
2HCl(aq) + Cr(s) → H2(g) + CrCl2(aq)
a. composition
b. single-displacement
c. decomposition
d. double-displacement
_____ 19. Calcium carbonate, CaCO3, reacts to form calcium oxide, CaO, and
carbon dioxide, CO2. What type of reaction is this?
a. synthesis
b. replacement
c. combustion
d. decomposition
_____ 20. What type of chemical reaction is represented by the following word
equation?
iron + oxygen → iron(II) oxide
a. synthesis
b. replacement
c. combustion
d. double-displacement
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Modern Chemistry
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Chapter Test A, continued
_____ 21. Metal X replaces the ions of metal Y from solution, but it cannot
replace the ions of metal Z from solution. The order these metals
should have in the activity series (from top to bottom) is
a. x, y, z
b. z, x, y
c. y, x, z
d. z, y, x
_____ 22. In a single-displacement reaction, an element in the activity series most
likely can replace any element
a. above it on the list.
b. in the same group.
c. below it on the list.
d. in any other group.
_____ 23. The activity series helps to predict
a. the amount of product formed by a chemical reaction.
b. whether or not a specific chemical reaction is possible.
c. the coefficients needed to balance a chemical equation.
d. the amount of energy needed to start a chemical reaction.
_____ 24. If calcium is listed above magnesium in the activity series, and
magnesium is listed above zinc, which of the following reactions is
possible?
a. Ca(s) + MgCl2(aq) →
b. Zn(s) + MgCl2(aq) →
c. Zn(s) + CaCl2(aq) →
d. Mg(s) + CaCl2(aq) →
_____ 25. You have an unknown metal, X. You conduct two experiments. The
results are shown in the table below.
Procedure
X(s) + NaCl(aq)
Result
no reaction
X(s) + ZnCl2(aq)
reaction of metal
Which of the following statements is a logical conclusion based on the
experimental data?
a. The unknown metal is higher on the activity series than both sodium
and zinc.
b. The unknown metal is higher on the activity series than sodium, but
below zinc.
c. The unknown metal is higher on the activity series than zinc, but
below sodium.
d. The unknown metal is below both sodium and zinc on the activity
series.
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Modern Chemistry
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Write a formula equation for each word equation in the space provided.
26. magnesium + oxygen → magnesium oxide
_______________________________________________________________
27. calcium carbonate → calcium oxide + carbon dioxide
_______________________________________________________________
On the line to the left, identify each chemical equation as a synthesis,
decomposition, single-displacement, or double-displacement reaction.
_____________________ 28. 2H2O(l) → 2H2(g) + O2(g)
_____________________ 29. Cl2(g) + 2KBr(aq) → 2KBr(aq) + Br2(l)
_____________________ 30. CaO(s) + H2O(l) → Ca(OH)2(s)
_____________________ 31. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
Balance the following formula equations in the space provided.
32. AgNO3 + CuCl2 → AgCl + Cu(NO3)2
_______________________________________________________________
33. PbO2 → PbO + O2
_______________________________________________________________
34. Zn(OH)2 + CH3COOH → Zn(CH3COO)2 + H2O
_______________________________________________________________
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Modern Chemistry
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Chapter Test B, continued
PART V Using the activity series table, predict whether each of the following
reactions will occur. Write no reaction for those that will not occur. For the
reactions that will occur, write the products and balance the equations in the
space provided.
35. Mg(s) + steam → ___________
__________________________
36. Pt(s) + O2(g) → _____________
__________________________
37. Cl2(g) + MgBr2(aq) → _______
__________________________
38. Zn(s) + HCl(aq) → __________
__________________________
39. Cr(s) + H2O(l) → ___________
__________________________
40. Ni(s) + CuCl2(aq) → _________
__________________________
41. Ni(s) + H2O(l) → ____________
__________________________
42.Mg(s) + Co(NO3)2(aq) → ______
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Modern Chemistry
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Chapter Test
Name ______________________________ Class ___________________ Date __________________
Metals
Li
Rb
K
Ba
Sr
Ca
Na
Mg
Al
Mn
Zn
Cr
Fe
Cd
Co
Ni
Sn
Pb
H2
Sb
Bi
Cu
Hg
Ag
Pt
Au
Activity Series of the Elements
Halogens
React with cold
H2O and acids, replacing
hydrogen. React
with oxygen,
forming oxides.
F2
Cl2
Br2
l2
React with steam
(but not cold water)
and acids, replacing
hydrogen. React
with oxygen,
forming oxides.
Do not react with water.
React with acids, replacing
hydrogen. React with
oxygen, forming oxides.
React with oxygen,
forming oxides.
Fairly unreactive,
forming oxides only
indirectly.
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Chapter Test