Spec Definitions

Question 1

Relative Isotopic Mass

Answer 1

The mass of an isotope compared with one-twelfth of the mass of an atom of carbon-12.

Question 2

Relative Atomic Mass

Answer 2

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.

Question 3

First Ionisation Energy

Answer 3

The energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions.

Question 4

Enthalpy Changes of Formation

Answer 4

When 1 mole of a compound is formed from its elements in their standard state under standard conditions.

Question 5

Enthalpy Changes of Combustion

Answer 5

When 1 mole of a substance reacts completely with oxygen under standard conditions, with all reactants and products in their standard state.

Question 6

Enthalpy Change of Neutralisation

Answer 6

The reaction of an acid by a base to form one mole of H2O under standard conditions, with all reactants and products in their standard state.

Question 7

Homologous Series

Answer 7

A series of organic compounds with the same functional group but with each successive number differing by CH3.

Question 8

Lattice Enthalpy

Answer 8

Enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions.

Question 9

Enthalpy Change of Solution

Answer 9

Enthalpy change that takes place when one mole of a compound is completely dissolved in H2O under standard conditions.

Question 10

Enthalpy Change of Hydration

Answer 10

Enthalpy change when one mole of isolated gaseous ions is dissolved in H2O forming 1 mole of aqueous ions under standard conditions.

Question 11

Stereoisomerism

Answer 11

Compounds with the same structural formula but with a different arrangement of atoms in space.