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SAT Subject Test
The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.
Electrolysis of water to form hydrogen and oxygen gases
Select an Answer
Precipitation
Correct Answer:
No
Oxidation-reduction
Correct Answer:
Yes
Distillation
Correct Answer:
No
Hydration
Correct Answer:
No
Condensation
Correct Answer:
No
View Correct Answer
The chemical equation for this reaction is
.
Note that the oxidation number of hydrogen changes from to
, and the oxidation number of oxygen changes from
to
. Hydrogen gains electrons and oxygen loses electrons. This is an oxidation-reduction reaction.
Question Difficulty:
medium