Manarat Alriyadh International School

SCIENCES 105

Assessment
Chapter Test A
Chapter: Oxidation-Reduction Reactions
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
_____ 1. During oxidation, one or more electrons are removed from a substance,
which increases its
a. size.
b. mass.
c. valence.
d. oxidation number.
_____ 2. The oxidation number of fluorine in a compound is always
a. 0.
b. -1.
c. +1.
d. +2.
_____ 3. In the reaction Cu + NO3 - + H 3O+ → Cu 2+ + NO + H 2O , the coefficients
of the balanced equation are
a. 1, 2, 2, 1, 1, 1.
b. 4, 3, 2, 4, 3, 1.
c. 6, 1, 2, 6, 1, 1.
d. 3, 2, 8, 3, 2, 12.
_____ 4. During a redox reaction, the oxidation numbers of oxidizing agents
a. decrease.
b. increase.
c. remain the same.
d. triple.
_____ 5. In the process of reduction,
a. electrons are lost.
b. electrons are gained.
c. protons are gained.
d. protons are lost.
_____ 6. The first step in the general plan for balancing redox equations is
a. writing the half-reaction for reduction.
b. writing the half-reaction for oxidation.
c. writing the unbalanced formula equation.
d. adjusting the coefficients of half-reactions