2.1.5 Redox

Question 1

Oxidation

Answer 1

Loss of electrons

Increase in oxidation number

Question 2

Reduction

Answer 2

Gain of electrons

Decrease in oxidation number

Question 3

Oxidation number of an element

Answer 3

0

Question 4

What do oxidation numbers in a compound add up to

Answer 4

0

Question 5

What is the oxidation number of a monoatomic ion equal to

Answer 5

The ionic charge

Question 6

In a polyatomic ion what do the sum of all oxidation numbers add up to

Answer 6

Charge on the ion

Question 7

Oxidation number of group 1 metals

Answer 7

+1

Question 8

Oxidation number of group 2 metals

Answer 8

+2

Question 9

Oxidation number of Al

Answer 9

+3

Question 10

Oxidation number of H

Answer 10

+1

Except in metal hydrides where it is -1 (NaH)

Question 11

Oxidation number of F

Answer 11

-1

Question 12

Oxidation number of Cl, Br, I

Answer 12

-1 except in compounds with oxygen and fluorine

Question 13

Oxidation number of O

Answer 13

-2

Except in peroxides and compounds with fluorine where it is -1

Question 14

How do metals normally form ions

Answer 14

Lose electrons

Increase oxidation number

Question 15

How do non-metals normally form ions

Answer 15

Gain electrons

Decrease oxidation number

Question 16

Acid and metal reaction, observations

Answer 16

Salt and hydrogen

Effervescence as H2 gas is evolved and metal will dissolve