Reactions and stiochiometry

Question 1

Relative isotopic mass

Answer 1

Relative isotopic mass = (mass of one atom of an isotope of an element) / 1/12 x the mass of one atom of 12 C

Question 2

Relative atomic mass

Answer 2

Relative atomic mass = (average mass of one atom of an element) / (1/12 x the mass of one atom of 12C)

Question 3

Relative molecular mass

Answer 3

Relative molecular mass = (average mass of one molecule of a substance) / 1/12 x the mass of one atom of 12C

Question 4

Relative formula mass

Answer 4

Relative formula mass = (average mass of one formula unit of a substance) / 1/12 x the mass of one atom of 12C

Question 5

Empirical formula

Answer 5

The empirical formula of a compound is the formula which shows the actual number of atoms of the different elements in the compound

Question 6

Reduction

Answer 6

A process whereby a substance gains electrons, resulting in a decrease in oxidation number

Question 7

Oxidation`

Answer 7

A process whereby a substance loses electrons, resulting in an increase in oxidation number

Question 8

Reducing agent

Answer 8

A substance that gives electrons to another, itself being oxidised in the process

Question 9

Oxidising agent

Answer 9

A substance that takes in electrons from another, itself being reduced in the processD