Chemistry IGCSE - Chemical Energetics

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Last updated 1:42 PM on 4/20/26
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11 Terms

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Exothermic reaction

transfers thermal energy to surroundings → increase in temperature of surroundings

<p><strong><u>transfers</u></strong> thermal energy to surroundings <span>→</span> increase in temperature of surroundings</p>
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Endothermic reaction

takes in thermal energy from surroundings → decrease in temperature of surroundings

<p><strong><u>takes in</u></strong> thermal energy from surroundings <span>→</span> decrease in temperature of surroundings</p>
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Exothermic bonds

Bond making is a exothermic process

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Endothermic bonds

Bond breaking is a endothermic process

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Exothermic reaction pathway diagram

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Endothermic reaction pathway diagram

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Important labels

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ΔH

transfer of thermal energy during a reaction is called → enthalpy change

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ΔH in exothermic reactions

Negative for exothermic reactions (green arrow)

<p><strong><u>Negative</u> </strong>for exothermic reactions (green arrow)</p>
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ΔH in endothermic reactions

Positive in endothermic reactions (green arrow)

<p><strong><u>Positive</u></strong> in endothermic reactions (green arrow)</p>
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Activation energy (Ea)

minimum energy that colliding particles must have to react

<p><span>minimum energy that colliding particles must have to react</span></p>