C6

Activation energy

The minimum amount of energy required to initiate a reaction, represented by the difference in energy between the reactants and the peak in a reaction profile.

Endothermic reaction

A reaction that absorbs energy from the surroundings, resulting in a decrease in temperature.

Exothermic reaction

A reaction that releases energy to the surroundings, causing an increase in temperature.

Burning reactions

Examples of exothermic reactions where substances react with oxygen, releasing energy in the form of heat and light.

Detonation of explosives

An exothermic reaction where explosive materials rapidly release a large amount of energy.

Reaction of acids with metals

An exothermic reaction where acids react with metals, producing heat and releasing energy.

Photosynthesis

An endothermic reaction where plants absorb energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

Break down of metal carbonates

An endothermic reaction where metal carbonates decompose into metal oxides, carbon dioxide, and heat.

Dissolving salts in water

An endothermic reaction where salts dissolve in water, absorbing energy from the surroundings.

Bond changes

The breaking of bonds between atoms requires an input of energy (endothermic), while the formation of bonds releases energy (exothermic).