Oxidation-Reduction Reactions Chemistry Worksheet Page 27
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Key Ideas
6.
Electrons are _____________ found unattached to atoms. Thus, for one element
or compound to lose electrons and be _____________, another element or
compound must be there to gain the electrons and be _____________. In other
words, _____________ (loss of electrons) must be accompanied by
_____________ (g ain of electrons).
7. Reactions in which electrons are _____________, resulting in oxidation and
reduction, are called oxidation‑reduction reactions.
8.
The separate oxidation and reduction equations are called _____________.
9. A(n) _____________ is a substance that loses electrons, making it possible for
another substance to gain electrons and be reduced.
10.
A(n) _____________ is a substance that gains electrons, making it possible for
another substance to lose electrons and be oxidized.
11. Oxidation is defined as the complete or _____________ loss of electrons,
reduction as the complete or partial gain of electrons.
12.
Just think of oxidation numbers as tools for keeping track of the _____________
in redox reactions.
13. If any element undergoes a(n) _____________ of oxidation number in the
course of a reaction, the reaction is a redox reaction. If an element’s oxidation
number _____________ in a reaction, that element is oxidized. If an element’s
oxidation number _____________ in a reaction, that element is reduced. The
reactant containing the element that is oxidized is the _____________ agent.
The reactant containing the element that is reduced is the _____________ agent.
14.
In combination reactions, _____________ elements or compounds combine to
form one compound.
15. In decomposition reactions, _____________ compound is converted into two or
more simpler substances.
16.
In a combustion reaction, oxidation is very rapid and is accompanied by
_____________ and usually _____________.
17. When any substance that contains carbon is combusted (or burned) completely,
the carbon forms _____________.
18.
When a substance that contains hydrogen is burned completely, the hydrogen
forms _____________.
19. When any substance that contains sulfur burns completely, the sulfur forms
_____________.
20.
In single‑displacement reactions, atoms of one element in a compound are
displaced (or replaced) by atoms from a(n) _____________.
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