3.1.4.1 Enthalpy Change Flashcards
1
Q
Define standard enthalpy change of combustion
A
The enthalpy change when one mole of substance is completely burnt in oxygen under standard conditions
2
Q
Define standard enthalpy change of formation
A
The enthalpy change when one mole of substance is formed from its elements with all reactants and products in their standard state
3
Q
What is enthalpy change?
A
The heat energy change measured under conditions of constant pressure
4
Q
What is an endothermic reaction?
A
A reaction that takes in energy
5
Q
What is an exothermic reaction?
A
A reaction that releases energy
6
Q
In experiments measuring the enthalpy change of reactions involving gases, what conditions must be kept constant?
A
Pressure
