1.6.3 Enthalpy Changes Flashcards
1
Q
What is an exothermic reaction?
A
- Products have less energy than reactants
- Energy given off by reaction into surroundings
2
Q
What is an endothermic reaction?
A
- Products have more energy than reactants
- Heat absorbed by reaction from surroundings
3
Q
Standard enthalpy of reaction is
A
When reactants react to give products under standard conditions
ΔHrꝊ
4
Q
Standard enthalpy of formation is
A
When 1 mole of a compound is formed from its elements under standard conditions
ΔHfꝊ
5
Q
Standard enthalpy of combustion is
A
The enthalpy change when 1 mole of a substance is burned in excess oxygen in standard conditions
ΔHcꝊ
6
Q
Standard enthalpy of neutralisation is
A
Enthalpy change when 1 mole of water is formed by reacting an acid with an alkali under standard conditions
ΔHneutꝊ
7
Q
Enthalpy change definition
A
Heat energy change at constant pressure
