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Chapter 23 Exam Review

Honors Physical Science Chapter 23 Test Review
 
Multiple Choice
Identify the choice that best completes the statement or answers the question.
 
____    1.   A(n) ____ chemical equation has the same number of atoms of each element on each side of the equation.
a.
balanced
c.
simple
b.
complex
d.
unbalanced
 
 
____    2.   Each substance on the left side of the arrow in a chemical equation is a ____.
a.
catalyst
c.
product
b.
coefficient
d.
reactant
 
 
____    3.   Which of the following is a balanced chemical equation?
a.
AgNO3 + NaCl ® 4AgCl + 2NaNO3
b.
2AgNO3 + 2NaCl ® 3AgCl + 2NaNO3
c.
AgNO3 + NaCl ® AgCl + NaNO3
d.
AgNO3 + 2NaCl ® AgCl + 3NaNO3
 
 
____    4.   The energy required to break the original bonds is less than the energy release when new bonds form in a(n) ____ reaction.
a.
endergonic
c.
precipitate
b.
exergonic
d.
aqueous
 
 
____    5.   If heat must be added to a chemical reaction for the reaction to take place, the reaction is ____.
a.
balanced
c.
exothermic
b.
endothermic
d.
reactant
 
 
____    6.   What type of reaction is shown in the following chemical equation: NH3 + HCl ® NH4Cl?
a.
decomposition
c.
single-displacement
b.
double-displacement
d.
synthesis
 
 
____    7.   Which of the following could represent a decomposition reaction?
a.
compound = element + element
b.
compound + compound = compound + compound
c.
element + compound = element + compound
d.
element + element = compound
 
 
____    8.   In a chemical equation, the symbol that means dissolved in water is ____.
a.
(aq)
c.
(dw)
b.
(s)
d.
(I)
 
 
____    9.   When one element replaces another element in a compound, the reaction is a ____ reaction.
a.
decomposition
c.
single–displacement
b.
double–displacement
d.
synthesis
 
 
____   10.   A substance that speeds up a chemical reaction without being permanently changed itself is a(n) ____.
a.
catalyst
c.
inhibitor
b.
coefficient
d.
reactant
 
 
____   11.   The breaking down of a substance into two or more simpler substances is ____.
a.
decomposition
c.
a catalyst
b.
displacement
d.
synthesis
 
 
____   12.   Each substance to the right of the arrow in a chemical equation is a(n) ____.
a.
catalyst
c.
reactant
b.
inhibitor
d.
product
 
 
____   13.   Substances that prevent, or slow down, chemical reactions are called ____.
a.
catalysts
c.
inhibitors
b.
endothermics
d.
products
 
 
____   14.   A chemical reaction in which heat energy is released is ____.
a.
endothermic
c.
flammable
b.
exothermic
d.
a formula
 
 
____   15.   Numbers that precede symbols and formulas in a chemical equation are ____.
a.
catalysts
c.
superscripts
b.
coefficients
d.
subscripts
 
 
____   16.   According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a.
There is no relationship.
b.
The mass of the products is greater.
c.
The mass of the reactants is greater.
d.
The masses are equal.
 
 
____   17.   What is an insoluble compound that forms during a chemical reaction?
a.
aqueous
c.
inhibitor
b.
catalyst
d.
precipitate
 
 
____   18.   A chemical reaction in which two or more substances combine to form another substance is called a ____.
a.
synthesis reaction
c.
product
b.
decomposition reaction
d.
reactant
 
 
____   19.   According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?
a.
0
c.
2
b.
1
d.
4
 
 
____   20.   What type of reaction is shown in the following chemical equation: 2H2O ® 2H2 + O2?
a.
decomposition
c.
single–displacement
b.
double–displacement
d.
synthesis
 
 
____   21.   The burning of wood in a campfire that produces heat and light would be both an ____ and an ____ reaction.
a.
endergonic, exothermic
c.
endergonic, endothermic
b.
exergonic, endothermic
d.
exergonic, exothermic
 
 
____   22.   When most chemical reactions take place, some ____ in the reactants must be broken, a process that requires energy.
a.
compounds
c.
precipitates
b.
chemical bonds
d.
products
 
 
Matching
 
Match each of the models  with the type of reaction it represents.
a.
 
b.
 
c.
 
d.
 
 
 
____   23.   single–displacement
 
____   24.   decomposition
 
____   25.   double–displacement
 
____   26.   synthesis
 
Completion
Complete each statement.
 
 
Figure 21-1
 
           27.   In the chemical equation shown in Figure 21-1, the substances in part A are called ____________________.
 
           28.   In Figure 21-1, the substances in part B are called ____________________.
 
           29.   In Figure 21-1, part C is called a(n) ____________________.
 
           30.   In Figure 21-1, part D is called a(n) ____________________.
 
           31.   In Figure 21-1, part E means that the material, O, is a(n) ____________________.
 
           32.   Figure 21-1, part F, is read as ____________________.
 
           33.   Figure 21-1, part G, means that the material, Sr(OH)2, is ____________________.
 
           34.   Figure 21-1, part H, means that the material, H2, is a(n) ____________________.
 
Short Answer
 
           35.   In the equation Ca(s) + 2H2O(l) ® Ca(OH)2(aq) + H2(g), list each element used as a reactant, and tell how many atoms of each are needed for this reaction.
 
           36.   Explain what is meant by a balanced chemical equation.
 
           37.   What is changed in a chemical equation to balance it? What cannot be changed?
 
           38.   What type of reaction is 2KClO3 ® 2KCl + 3O2?
 
           39.   What type of reaction is 2K + 2H2O ® 2KOH + H2?
 
           40.   What type of reaction is 2Mg + O2 ® 2MgO?
 
           41.   What type of reaction is Pb(NO3)2 + 2KI ® PbI2 + 2KNO3?

 
Honors Physical Science Chapter 23 Test Review
Answer Section
 
MULTIPLE CHOICE
 
            1.   ANS:  A 
            2.   ANS:  D 
            3.   ANS:  C 
            4.   ANS:  B 
            5.   ANS:  B 
            6.   ANS:  D  
            7.   ANS:  A 
            8.   ANS:  A 
            9.   ANS:  C 
           10.   ANS:  A 
           11.   ANS:  A 
           12.   ANS:  D 
           13.   ANS:  C 
           14.   ANS:  B 
           15.   ANS:  B 
           16.   ANS:  D 
           17.   ANS:  D 
           18.   ANS:  A 
           19.   ANS:  C 
           20.   ANS:  A 
           21.   ANS:  D 
           22.   ANS:  B 
MATCHING
 
           23.   ANS:  D 
           24.   ANS:  A 
           25.   ANS:  B 
           26.   ANS:  C  
COMPLETION
 
           27.   ANS:  reactants
 
           28.   ANS:  products
 
           29.   ANS:  element
 
           30.   ANS:  coefficient
           31.   ANS:  liquid
 
           32.   ANS:  produces, forms
 
           33.   ANS:  aqueous, a solid dissolved in water
 
           34.   ANS:  gas
SHORT ANSWER
 
           35.   ANS:  
Ca, calcium, 1; H, hydrogen, 4; O, oxygen, 2
 
           36.   ANS:  
The same number of atoms of each element are on both sides of the equation.
 
           37.   ANS:  
coefficients; subscripts
 
           38.   ANS:  
decomposition
 
           39.   ANS:  
single–displacement
 
           40.   ANS:  
synthesis
 
           41.   ANS:  
double–displacement
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