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Chemistry Review 8
Chemical Equations and Reactions
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.
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)
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.
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
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.
The formation of a solid product in a
chemical reaction is represented by the
symbol
A. (aq).
B. (g).
C. (l).
D. (s).
What symbol indicates a reversible
reaction?
A.
B.
C.
D.
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.
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
Which equation below violates the law
of conservation of mass?
A. 2H2 + O2 2H2O
B. KCl + Br2 KBr Cl2
C. 2Fe2O3 + 3C 4Fe + 3CO2
D. Na2CO3 + 2HCl 2NaCl + H2O + CO2
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
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
Which equation is not balanced?
A. 2H2 + O2 2H2O
B. 4H2 + 2O2 4H2O
C. H2 + H2 + O2 H2O + H2O
D. 2H2 + O2 H2O
In which type of reaction do two or more
compounds react to form one product?
A. synthesis
B. decomposition
C. combustion
D. single-displacement
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.
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
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
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
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
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
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
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.
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.
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) 
Final Jeopardy
You have an unknown metal, X. You conduct two
experiments. The results are shown in the table
below.
Procedure
Result
X(s) + NaCl(aq)
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.