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Module 16: Reduction/Oxidation Reactions
vocabulary
21
Chemistry
12th Grade
11/08/2011

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Term
oxidation number
Definition

The charge that

an atom in a molecule would develop

if the most electronegative atoms in the molecule took the shared electrons from the less electronegative atoms. (525)

Term
The sum of all oxidation numbers in a molecule must equal ________________.
Definition

the charge of that molecule.

 

(526)

Term

1. When a substance has

only one type of atom in it,

the oxidation number for that atom

is equal to the _________ of the substance

divided by ___________________________.

Definition

When a substance has only one type of atom in it the oxidation number for that atom is equal to the charge of the substance divided by the number of atoms present.

(526)

Term

2. Group 1A metals (Li, Na, K, Rb, Cs, and Fr) always have oxidation numbers of ___

in molecules that contain more than

one type of atom.

Definition

+1

 

(526)

Term

3. Group 2A metals (Be, Mg, Ca, Sr, Ba, and Ra) always have oxidation numbers of ____ in molecules that contain more than

one type of atom.

Definition

+2

 

(526)

Term

4. Fluorine always has a ___ oxidation number in molecules that contain

more than one type of atom.

Definition
-1 (526)
Term

*5. When grouped with just one other atom that happens to be a metal,

H has an oxidation number of ____.

In all other cases in which it is grouped

with other atoms, H has

an oxidation number of ____.

Definition

-1, +1

 

(526)

Term
*6. Oxygen has an oxidation number of ___ in molecules that contain more than one type of atom.
Definition

-2

 

(526)

Term

*7. If all else fails, assume that the atom's oxidation number is the same as what it would take on in an _______ ___________. The atoms that are

most likely to follow this rule

are in groups ____, _____, and _____.

Definition

ionic compound,

3A, 6A, and 7A.

 

(526)

Term
Oxidation
Definition
Process by which an atom loses electrons. (531)
Term
Reduction
Definition
Process by which an atom gains electrons. (531)
Term

When a redox reaction occurs,

there will always be

one atom that is __________

and one atom that is ________.

Definition

oxidized,

reduced

(535)

Term
Anode
Definition

The negative side of a battery, the side at which oxidation occurs.

(538)

Term
Anion
Definition

A negative ion

(538)

Term
Cathode
Definition

Positive side of a battery, the electrode at which reduction occurs.

(538)

Term
Cation
Definition

A positive ion

(538)

Term
Galvanic cell
Definition

An electricity-producing cell

that runs on a redox reaction.

(538)

Term
Electrode
Definition

An electrical conductor

used to make contact

with a nonmetallic part of a circuit.

(539)

Term
Lead-acid battery
Definition

 

A battery that runs on the oxidation of lead and the reduction of lead (IV) oxide

in the presence of sulfuric acid.

(542)

Term
Dry cell
Definition
A battery made with no aqueous solutions. (544)
Term
Alkaline dry cell
Definition

A dry cell made with

a potassium hydroxide salt bridge.

(544)

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