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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 neutral subatomic particle
B
An element
C
A posititive subatomic particle
D
A negative subatomic particle
2) What is a proton?
A
A posititive subatomic particle
B
An element
C
A negative subatomic particle
D
A neutral subatomic particle
3) An atoms mass number equals the number of
A
protons plus the number of electrons
B
protons
C
neutrons
D
protons plus the number of neutrons
4) Two different isotopes of an element have different
A
atomic numbers
B
numbers of protons
C
numbers of electrons
D
numbers of neutrons
5) An atoms atomic number is equal to
A
the number of protons plus electrons
B
the number of protons plus neutrons in the nucleus
C
the number of protons plus electrons plus neutrons
D
the number of protons in the nucleus
6) A chemical equation is balanced by changing or adding
A
coefficients
B
chemical symbols
C
reactants
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, the forward reaction rate must be less than the reverse reaction rate.
C
In equilibrium, both forward and reverse reactions must stop.
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
Molecules are formed.
B
Energy is absorbed.
C
Atoms are rearranged.
D
Chemical bonds are broken
9) The substance that is formed in a chemical reaction is called the
A
polymer.
B
reactant.
C
product.
D
radical.
10) Which is not true of enzymes?
A
They are catalysts.
B
They are inefficient.
C
They are proteins.
D
They are affected by temperature.
*select an answer for all questions
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