(4)Energy profile diagrams

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Energy profile diagram

A diagram that shows the energy changes that occur during the course of a chemical reaction.

Exothermic reaction

A chemical reaction that releases energy, typically as heat.

Energy of products in an exothermic reaction

The products have less energy than the reactants, with the excess energy released as heat.

Temperature change in an exothermic reaction

The temperature increases because energy is released as heat, causing the reaction vessel to warm up.

Exothermic energy profile

The reactants are shown at a higher energy level than the products, with an energy barrier between them.

Activation energy

The energy barrier that must be overcome for a chemical reaction to occur.

Endothermic reaction

A chemical reaction that absorbs energy, typically in the form of heat.

Energy absorbed in an endothermic reaction

Reactants take in heat, which is converted into chemical energy and helps break bonds so the reaction can proceed.

Energy of products in an endothermic reaction

The products have more energy than the reactants because energy has been absorbed during the reaction.

Temperature change in an endothermic reaction

The temperature falls because heat energy is taken from the surroundings, causing the reaction vessel to cool down.

Endothermic energy profile

The reactants are shown at a lower energy level than the products.

Catalysed reaction profile

A reaction profile showing a catalysed pathway with a lower activation energy than the uncatalysed pathway.

Effect of a catalyst on activation energy

A catalyst provides an alternative reaction pathway with a lower activation energy.

Catalysed energy profile diagram requirements

The diagram should show a lower activation energy and use colour coding or a key to distinguish the catalysed and uncatalysed reactions.