Limited Time Offer: Get 2 Months of ABCmouse.com for only $5!

Chapter 23 Exam Review

Physical Science Chapter 23 Exam 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                   PTS:   1                     DIF:    B         OBJ:     2/1
STA:   PS2.1 CS1.1
 
           2.                    ANS:  D                   PTS:   1                     DIF:    B         OBJ:     1/1
STA:   PS2.1 CS1.1
 
           3.                    ANS:  C                    PTS:   1                     DIF:    B         OBJ:     2/2
STA:   PS2.1 CS1.1
 
           4.                    ANS:  B                    PTS:   1                     DIF:    B         OBJ:     4/2
STA:   PS2.1 CS1.1
 
           5.                    ANS:  B                    PTS:   1                     DIF:    B         OBJ:     4/1
STA:   PS2.1 CS1.1
 
           6.                    ANS:  D                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           7.                    ANS:  A                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           8.                    ANS:  A                   PTS:   1                     DIF:    B         OBJ:     1/3
STA:   PS2.1 CS1.1
 
           9.                    ANS:  C                    PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           10.                  ANS:  A                   PTS:   1                     DIF:    B         OBJ:     4/3
STA:   PS2.1 CS1.1
 
           11.                  ANS:  A                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           12.                  ANS:  D                   PTS:   1                     DIF:    B         OBJ:     1/1
STA:   PS2.1 CS1.1
 
           13.                  ANS:  C                    PTS:   1                     DIF:    B         OBJ:     4/3
STA:   PS2.1 CS1.1
 
           14.                  ANS:  B                    PTS:   1                     DIF:    B         OBJ:     4/2
STA:   PS2.1 CS1.1
 
           15.                  ANS:  B                    PTS:   1                     DIF:    B         OBJ:     1/3
STA:   PS2.1 CS1.1
 
           16.                  ANS:  D                   PTS:   1                     DIF:    B         OBJ:     1/2
STA:   PS2.1 CS1.1
 
           17.                  ANS:  D                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           18.                  ANS:  A                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           19.                  ANS:  C                    PTS:   1                     DIF:    B         OBJ:     1/2
STA:   PS2.1 CS1.1
 
           20.                  ANS:  A                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           21.                  ANS:  D                   PTS:   1                     DIF:    B         OBJ:     4/2
STA:   PS2.1 CS1.1
 
           22.                  ANS:  B                    PTS:   1                     DIF:    B         OBJ:     4/1
STA:   PS2.1 CS1.1
 
MATCHING
 
           23.                  ANS:  D                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           24.                  ANS:  A                   PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           25.                  ANS:  B                    PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
           26.                  ANS:  C                    PTS:   1                     DIF:    B         OBJ:     3/1
STA:   PS2.1 CS1.1
 
COMPLETION
 
           27.                  ANS:  reactants
 
PTS:   1                     DIF:    B                    OBJ:   1/1                  STA:   PS5.1 CS1.2
 
           28.                  ANS:  products
 
PTS:   1                     DIF:    B                    OBJ:   1/1                  STA:   PS5.1 CS1.2
 
           29.                  ANS:  element
 
PTS:   1                     DIF:    B                    OBJ:   1/1                  STA:   PS5.1 CS1.2
 
           30.                  ANS:  coefficient
 
PTS:   1                     DIF:    B                    OBJ:   1/1                  STA:   PS5.1 CS1.2
 
           31.                  ANS:  liquid
 
PTS:   1                     DIF:    B                    OBJ:   1/4                  STA:   PS5.1 CS1.2
 
           32.                  ANS:  
produces
forms
 
PTS:   1                     DIF:    B                    OBJ:   1/4                  STA:   PS5.1 CS1.2
 
           33.                  ANS:  
aqueous
a solid dissolved in water
 
PTS:   1                     DIF:    B                    OBJ:   1/4                  STA:   PS5.1 CS1.2
 
           34.                  ANS:  gas
 
PTS:   1                     DIF:    B                    OBJ:   1/4                  STA:   PS5.1 CS1.2
 
SHORT ANSWER
 
           35.                  ANS:  
Ca, calcium, 1; H, hydrogen, 4; O, oxygen, 2
 
PTS:   1                     DIF:    A                   OBJ:   1/1                  STA:   PS2.1 CS1.2
 
           36.                  ANS:  
The same number of atoms of each element are on both sides of the equation.
 
PTS:   1                     DIF:    A                   OBJ:   2/1                  STA:   PS2.1 CS1.2
 
           37.                  ANS:  
coefficients; subscripts
 
PTS:   1                     DIF:    B                    OBJ:   2/2                  STA:   PS2.1 CS1.2
 
           38.                  ANS:  
decomposition
 
PTS:   1                     DIF:    B                    OBJ:   3/1                  STA:   PS2.1 CS1.2
 
           39.                  ANS:  
single–displacement
 
PTS:   1                     DIF:    A                   OBJ:   3/1                  STA:   PS2.1 CS1.2
 
           40.                  ANS:  
synthesis
 
PTS:   1                     DIF:    B                    OBJ:   3/1                  STA:   PS2.1 CS1.2
 
           41.                  ANS:  
double–displacement
 
PTS:   1                     DIF:    A                   OBJ:   3/1                  STA:   PS2.1 CS1.2

 

Get 2 Months for $5!