Redox Reactions

Question 1

What is an oxidation number?

Answer 1

Number of electrons lost or gained in bonding

Question 2

What is the oxidation state of pure elements?

Answer 2

0

Question 3

What is the oxidation state of monoatomic ions?

Answer 3

Their ionic charge e.g. Mg 2+ ion has oxidation state of +2.

Question 4

What is the oxidation state of neutral compounds?

Answer 4

OVERALL oxid state = 0

Individ atom will have its own oxid state

Question 5

What is the Pauling scale?

Answer 5

Table showing the electronegativity of elements

Question 6

What is electronegativity?

Answer 6

The ability of an element to attract electrons

Question 7

What is the most electronegative element?

Answer 7

Fluorine

Question 8

What is the rule for the oxidation state of polyatomic ions?

Answer 8

1. Oxid number = overall charge of ion

2. E.g. SO4 has a an oxid numb of -2

Question 9

How can you tell which element in a compound has a positive or negative oxidation number?

Answer 9

1. The element with a lower electronegative value will have a POSITIVE oxidation number and vi ver
2. Always calculate the oxid number of the most electronegative element first.

Question 10

Define reduction.

Answer 10

1. Gain of electrons
2. Decrease in oxidation number
3. Loss of oxygen

Question 11

Define oxidation.

Answer 11

1. Loss of electrons
2. Increase in oxidation number
3. Gain of oxygen

Question 12

In hydrogen peroxide, what is the oxidation state of oxygen?

Answer 12

-1

Question 13

What is disproportionation?

Answer 13

When a single element is both reduced and oxidised