1 e) Chemical Formulae, Equations & Calculations

Question 1

Empirical Formula

Answer 1

Simplest whole-number ratio of the atoms present in a compound.

Question 2

Mole

Answer 2

A unit of the amount of substance containing the same number of particles as there are carbon atoms in 12g of C-12.

Question 3

Water of Crystallisation

Answer 3

Water molecules that are part of a crystal structure in which they are chemically bound up with a salt, represented by ·nH2O.

Question 4

Anhydrous

Answer 4

Without water

Question 5

Aqueous

Answer 5

Dissolved in water

Question 6

Balancing the equation

Answer 6

Putting coefficients in front of formulae so that the same number of atoms of each type is on both sides of an equation.

Question 7

Coefficient

Answer 7

Number written in front of formulae in a balanced chemical equation.

Question 8

Formula

Answer 8

Representation of a chemical showing the elements present.

Question 9

Molar Mass

Answer 9

Mass of 1 mole of a substance

Question 10

Molar Volume

Answer 10

Volume occupied by 1 mole of a gas

Question 11

Molecular Formula

Answer 11

Actual number of each type of atom present in a molecule.

Question 12

Relative Formula Mass

Answer 12

The weighted average mass of a formula unit of a compound, relative to the mass of 1/12th of a C-12 atom. (sometimes called relative molecular mass)

Question 13

Word Equation

Answer 13

Representation of a chemical reaction using the names of the chemicals only.

Question 14

Yield

Answer 14

Amount of something that is produced in a reaction.