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SQA Higher Chemistry Enthalpy Change

Enthalpy Change

This page covers the following topics:

1. Standard Enthalpy Change
2. Calorimetry

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

Standard Enthalpy Change

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.

Calorimetry

1

Why are standard conditions used?

Why are standard conditions used?

2

Suggest one source of error in calorimetry equipment

Suggest one source of error in calorimetry equipment

3

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

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?

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

5

What is measured in calorimetry?

What is measured in calorimetry?

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