Chap 7 Reactions Review Question Preview (ID: 17399)


Physical Science Chapter 7. TEACHERS: click here for quick copy question ID numbers.

What is an electron?
a) A negative subatomic particle
b) A posititive subatomic particle
c) A neutral subatomic particle
d) An element

What is a proton?
a) A negative subatomic particle
b) A posititive subatomic particle
c) A neutral subatomic particle
d) An element

An atoms mass number equals the number of
a) protons plus the number of electrons
b) protons plus the number of neutrons
c) neutrons
d) protons

Two different isotopes of an element have different
a) atomic numbers
b) numbers of neutrons
c) numbers of protons
d) numbers of electrons

An atoms atomic number is equal to
a) the number of protons in the nucleus
b) the number of protons plus neutrons in the nucleus
c) the number of protons plus electrons
d) the number of protons plus electrons plus neutrons

A chemical equation is balanced by changing or adding
a) coefficients
b) chemical symbols
c) subscripts
d) reactants

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, the forward and reverse reaction rates must be equal.
d) In equilibrium, both forward and reverse reactions must stop.

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) Energy is absorbed.
d) Molecules are formed.

The substance that is formed in a chemical reaction is called the
a) product.
b) polymer.
c) radical.
d) reactant.

Which is not true of enzymes?
a) They are inefficient.
b) They are catalysts.
c) They are affected by temperature.
d) They are proteins.

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