An exothermic chemical reaction is a type of reaction in which energy is transferred from the reactants to the surroundings e.g. combustion.

An endothermic chemical reaction is a type of reaction in which energy is transferred from the surroundings to the products e.g. photosynthesis.

A solution is formed when a substance dissolves into a liquid.

Calorimetry is an experiment than can be used to measure an energy change during a reaction.

Energy changes in reactions

Combined science

Energy changes: displacement practical

Energy changes: neutralisation practical

Reaction profiles

Breaking and making bonds

In the Rate of Reaction unit, pupils will build on their understanding of energy changes to learn about the factors that influence the rate of chemical reactions.

In the Fuels and Energetics unit, pupils learned about energy changes during chemical reactions, including exothermic and endothermic reactions.

This unit covers bulk material properties related to bonding and intermolecular forces and explores bond breaking, bond making, activation energy, and reaction profiles. It focuses on selecting appropriate techniques, translating data, and presenting observations using various models.

The more reactive element takes the place of a less reactive element in a compound.

Exothermic chemical reaction is a type of reaction in which energy is transferred from the reaction to the surroundings e.g. combustion.

A prediction that is supported with an explanation.

Sums up what has been found out during the investigation. It always refers to both the independent and dependent variables.

A chart showing solid columns; to present data usually used when one variable is discrete.

Neutralisation is when a chemical reaction takes place between an acid and base to produce a neutral solution of a salt and water.

An exothermic reaction is a type of reaction in which energy is transferred from the reactants to the surroundings e.g. combustion.

A method describes how an experiment is carried out; it is a step-by-step procedure.

A line graph involves two continuous variables being plotted to show if a relationship exists between them. Any trends in the data are shown with the addition of a line of best fit.

A conclusion sums up what has been found out during an investigation. It always refers to both the independent and dependent variables.

An exothermic chemical reaction is a type of reaction in which energy is transferred from the reactants to the surroundings, e.g. combustion.

An endothermic chemical reaction is a type of reaction in which energy is transferred from the surroundings to the products, e.g. photosynthesis.

The minimum energy that the particles must have in order to react is known as the activation energy.

A reaction profile is a diagram showing the energy changes during exothermic and endothermic reactions.

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Energy changes in reactions

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