Chemistry 3.2.1.

Question 1

Activation energy

Answer 1

the minimum amount of energy needed for a reaction to take place.

Question 2

Average bond enthalpy

Answer 2

the average enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond in the molecules of a gaseous species.

Question 3

Endothermic

Answer 3

a reaction when energy is taken into the system, from the surroundings.

Question 4

Exothermic

Answer 4

a reaction when energy is released from a system, to the surroundings.

Question 5

Standard Enthalpy change of Combustion

Answer 5

the enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, with all reactants and products in their standard states.

Question 6

Standard Enthalpy Change of Formation

Answer 6

the enthalpy change that takes place when one mole of a compound is formed from its constituent elements under standard conditions, with all reactants and products in their standard states.

Question 7

Standard Enthalpy Change of Neutralisation

Answer 7

the enthalpy change that takes place in the reaction of an acid by a base to form one mole of H2O (l), under standard conditions, with all reactants and products in their standard states.