3:Redox

Question 1

What is an oxidation number?

Answer 1

The number of electrons an atom uses to bond with any other atom.

Question 2

What is the oxidation number of an element?

Answer 2

0

Question 3

What is the oxidation number of oxygen in most compounds?

Answer 3

-2

Question 4

What is the oxidation number of oxygen in peroxides?

Answer 4

-1

Question 5

What is the oxidation number of hydrogen in most compounds?

Answer 5

+1

Question 6

What is the oxidation number of hydrogen in metal hydrides?

Answer 6

-1

Question 7

What is the oxidation number of a simple ion?

Answer 7

The charge of an ion?

Question 8

What are oxyanions?

Answer 8

Negative ions that have an element along with oxygen.

Question 9

What is oxidation?

Answer 9

The loss of electrons & increase in oxidation number.

Question 10

What is reduction?

Answer 10

Gain of electrons & decrease in oxidation number.

Question 11

What is a redox reaction?

Answer 11

A reaction in which both oxidation and reduction takes place.

Question 12

What is an oxidising agent?

Answer 12

Species that gains electrons.

Question 13

What is a reducing agent?

Answer 13

Species that loses electrons.

Question 14

What is disproportionation?

Answer 14

When an element in a single species is being simultaneously reduced & oxidised.

Question 15

What are the half equations for

SnO + Zn -> ZnO + Sn

Answer 15

Sn2+ + 2e- -> Sn

Zn -> Zn2+ + 2e-

Question 16

What is the ionic equation for

SnO + ZnO -> ZnO + Sn

Answer 16

Sn2+ + Zn -> Sn + Zn2+.