Redox

Question 1

What is the rule for the oxidation number of any uncombined elements?

Answer 1

The oxidation number of any uncombined element is zero

Question 2

What is the rule for the oxidation number of any uncombined ion?

Answer 2

The oxidation number of an uncombined ion is the same as its charge

Question 3

What is the rule for oxidation numbers in a molecule?

Answer 3

The sum of all the oxidation numbers in a molecule is equal to 0

Question 4

What is the rule for the oxidation number of fluorine?

Answer 4

Fluorine always has an oxidation number of -1

Question 5

What is the rule for the oxidation number of hydrogen?

Answer 5

Hydrogen always has an oxidation number of +1, except in metal hydrides when it is -1

Question 6

What is the rule for the oxidation number of oxygen?

Answer 6

Oxygen always has an oxidation number of -2, except in peroxides when it is -1 and when with fluorine where it is +1

Question 7

What is the rule for the oxidation number of chlorine?

Answer 7

Chlorine always have an oxidation number of -1, except with oxygen fluorine when it is positive

Question 8

What is the rule for oxidation number of groups 1, 2 and 3 elements?

Answer 8

Group 1 elements always have an oxidation number of plus one, group two always have +2 and a group 3 always have +3

Question 9

What does OILRIG mean?

Answer 9

Oxidation
Is
Loss of electrons
Reduction
Is
Gain of electrons

Question 10

What a disproportionation reaction?

Answer 10

When a substance is both oxidised and reduced in the same reaction

Question 11

What is a redox reaction?

Answer 11

A reaction where both oxidation and reduction occur