Test 3: Oxidation-Reduction Reactions

Question 1

In acid-base and precipitation reactions, ions ____ but they maintain the ___.

Answer 1

swap partners, same charge.

Question 2

In oxidation-reduction (redox) reactions, atoms gain or lose electrons by

Answer 2

trading or sharing in different ways

Question 3

Oxidation number

Answer 3

Number of an element’s gained or lost electrons

Question 4

To correctly identify and characterize redox reactions we need a way to

Answer 4

track electron
ownership and transfer.

Question 5

How do we track electron ownership and transfer?

Answer 5

by calculating the oxidation number

Question 6

the first step when assigning an oxidation number is to determine if a species is __(3)

Answer 6

neutral(elemental), an ion or ionic compound, or a covalent compound

Question 7

The oxidation number for any neutral element in its standard state is

Answer 7

zero

Question 8

The oxidation number for any ion or ions in an ionic compound

Answer 8

the charge of the
ion.

Question 9

The sum of the oxidation numbers in any molecule or polyatomic ion equals

Answer 9

the total overall charge of that molecule or polyatomic ion.

Question 10

For covalent compounds, use the following assignments in exactly this order (oxidation-reduction)

Answer 10

H = +1, F = -1, O = -2, (Cl, Br, I )= -1

Question 11

Oxidation occurs when

Answer 11

something loses electrons

Question 12

Reduction occurs when

Answer 12

something gains electrons (the charge is reduced)

Question 13

A polyatomic ion is bound together by a

Answer 13

covalent bond

Question 14

OiL RiG is a way to remember

Answer 14

Oxidation Loses & Reduction Gains (electrons)