Enthalpy is the overall energy content of substances in a reaction, it is represented by ∆H. In order to compare reactions and calculate energy changes accurately ∆H is calculated using theoretical standard conditions.

Calorimetry measures enthalpy changes from combustion using the equipment shown. It can also be used to measure other reactions using a beaker with a cork stopper and thermometer.

1

Why are standard conditions used?

2

Suggest one source of error in calorimetry equipment

3

Why and how is the change in mass of the spirit burner measured?

4

Why should the starting temperature of the water be kept the same?

5

What is measured in calorimetry?