C5 Chemical Energies

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IGCSE Chemistry

Last updated 11:06 PM on 7/22/26
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11 Terms

1
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Define activation energy (Ea)

The energy that needs to be overcome in order for a reaction to take place

2
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What is an Enthalpy and how is it represented?

The total change in energy, represented in ΔH

3
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What is an exothermic reaction?

A chemical reaction that transfers thermal energy into its surroundings (releases energy)

4
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What does an exothermic reaction increase?

The temperature of its surroundings (more stable products)

5
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Give some examples of exothermic reactions

Combustion, respiration

6
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What is an endothermic reaction?

A chemical reaction that absorbs thermal energy from its surroundings

7
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What does an endothermic reaction decrease?

The temperatureof its surroundings

8
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How is an exothermic reaction represented in an enthalpy?

-ΔH

9
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How is an endothermic reaction represented in an enthalpy?

+ΔH

10
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<p>Does this graph represent an endothermic or exothermic reaction?</p>

Does this graph represent an endothermic or exothermic reaction?

Exothermic reaction

11
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<p>Does this graph represent an endothermic or exothermic reaction?</p>

Does this graph represent an endothermic or exothermic reaction?

Endothermic reaction