Chp 5

Question 1

Enthalpy change

Answer 1

Measure of heat content of a substance at constant pressure

Question 2

Law of conservation of energy

Answer 2

Energy cannot be created or destroyed, it can only be converted from one form to another

Question 3

Exothermic reaction

Answer 3

Heat goes from the system to the surrounding

Question 4

Endothermic

Answer 4

Heat goes from surrounding to the system

Question 5

Enthalpy change of reaction

Answer 5

The change of enthalpy in relation to the complete conversion of 1 mole of reactant to a product

Question 6

Enthalpy chanfe of solution

Answer 6

Enthalpy change when 1 mole of a substance is dissolved in water

Question 7

Enthalpy change of neutralisation

Answer 7

Enthalpy change when an acid and base react to produce 1 mole of water

Question 8

Enthalpy change of combustion

Answer 8

Enthalpy change the complete combustion of 1 mole of a substance in oxygen

Question 9

Standard enthalpy change of combustion

Answer 9

Enthalpy change when 1 mole of substance is burnt in excess oxygen at a pressure of 1 atm and at a temp of 25°C

Question 10

Hess’s Law

Answer 10

The enthalpy chage for a reaction is independent of the pathway taken from reactants to products

Question 11

Standard enthalpy change of formation

Answer 11

Enthalpy change when 1 mole of a substance is formed in their standard states (1 atm, 298K)