What is an exothermic reaction?

An exothermic reaction releases heat energy to the surroundings, causing an increase in temperature.

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What happens during a neutralisation reaction between an acid and alkali?

A salt and water are produced. It is an exothermic reaction, releasing heat.

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What is the aim of the practical?

To investigate the variables that affect the temperature change in chemical reactions.

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What is the independent variable in the practical?

The volume of sodium hydroxide solution added.

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What is the dependent variable in the practical?

The temperature change.

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How is the initial temperature measured?

Using a thermometer in the hydrochloric acid before any sodium hydroxide is added.

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How much sodium hydroxide solution is added each time?

5 cm3

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Why must a lid be placed on the cup?

To prevent heat escaping to surroundings, for a more accurate result.

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Why is a second trial completed?

To improve reliability of results by allowing anomalies to be identified.

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