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Chap 7 Reactions Review
Test Description: Physical Science chapter 7
Instructions: Answer all questions to get your test result.
1) What is an electron?
A
A negative subatomic particle
B
A neutral subatomic particle
C
An element
D
A posititive subatomic particle
2) What is a proton?
A
An element
B
A posititive subatomic particle
C
A neutral subatomic particle
D
A negative subatomic particle
3) An atoms mass number equals the number of
A
protons
B
protons plus the number of neutrons
C
protons plus the number of electrons
D
neutrons
4) Two different isotopes of an element have different
A
numbers of protons
B
numbers of neutrons
C
atomic numbers
D
numbers of electrons
5) An atoms atomic number is equal to
A
the number of protons in the nucleus
B
the number of protons plus electrons
C
the number of protons plus electrons plus neutrons
D
the number of protons plus neutrons in the nucleus
6) A chemical equation is balanced by changing or adding
A
reactants
B
coefficients
C
chemical symbols
D
subscripts
7) What is the relationship between chemical equilibrium and the rates of forward and reverse reaction?
A
In equilibrium, the forward reaction rate must be greater than the reverse reaction rate
B
In equilibrium, both forward and reverse reactions must stop.
C
In equilibrium, the forward reaction rate must be less than the reverse reaction rate.
D
In equilibrium, the forward and reverse reaction rates must be equal.
8) Which of the following occurs in an endothermic reaction but not in an exothermic reaction?
A
Chemical bonds are broken
B
Atoms are rearranged.
C
Molecules are formed.
D
Energy is absorbed.
9) The substance that is formed in a chemical reaction is called the
A
reactant.
B
polymer.
C
radical.
D
product.
10) Which is not true of enzymes?
A
They are catalysts.
B
They are affected by temperature.
C
They are proteins.
D
They are inefficient.
*select an answer for all questions
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