FC19

Question 1

Define Enthalpy change of reactions

Answer 1

The enthalpy change when the number of moles of reactions in an equation reacts to form the products

Question 2

Define enthalpy change of combustion

Answer 2

Enthalpy change when one mol of a substance undergoes complete combustion in excess oxygen

Question 3

Define enthalpy change of formation

Answer 3

Enthalpy change when one mol of a substance is formed from its elements

Question 4

Define enthalpy change of neutralisation

Answer 4

Enthalpy change which one mol of water is formed in a neutralisation reaction

Question 5

What are the assumptions for calculations enthalpy change of combustion from calorimetry

Answer 5

1) All the heat from combustion transfers to water/substances being heated.

2) The fuel undergoes complete combustion only

3) No fuel or water evaporates.