Acids And Redox

Question 1

What is the oxidation number?

Answer 1

Based on a set of rules that apply to atoms and can be thought of as the number of electrons involved in bonding to a different element.

Question 2

What are the oxidation rules for elements?

Answer 2

The oxidation number is always 0 for elements or compounds with a single element

Question 3

What are the oxidation rules for compounds and ions?

Answer 3

Each atom in a compound has an oxidation number

An oxidation number has a sign, which is placed before the number.

Question 4

Oxidation number for O?

Answer 4

-2

Question 5

The oxidation number of H

Answer 5

+1

Question 6

Oxidation number of F

Answer 6

-1

Question 7

Oxidation number of Na+, K+

Answer 7

+1

Question 8

Oxidation number of Mg2+, Ca2+

Answer 8

+2

Question 9

Oxidation number of Cl-, Br-, I-

Answer 9

-1

Question 10

Oxidation number of H in metal hydrides

Answer 10

-1

Question 11

Oxidation number of O in peroxides

Answer 11

-1

Question 12

Oxidation number in O bonded to F

Answer 12

+2

Question 13

How to work out oxidation numbers

Answer 13

Sum of oxidation numbers=total charge

Account for all elements and superscript numbers

Question 14

Using Roman numerals in naming

Traditional and modern

Answer 14

Roman numerals are the modern names and shows oxidation number
Traditional names use -ate and -ite
-ite is 1 less than -ate

Question 15

What does reduction mean?

Answer 15

Removal of oxygen
Gain in electrons
Decrease in oxidation number

Question 16

What does oxidation mean?

Answer 16

Addition of oxygen
Loss of electrons
Increase in oxidation number

Question 17

What are redox reactions?

Answer 17

Involve oxidation and reduction

When working out what has been reduced and oxidised, take into account, all elements in every compound