C5 supplement

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5 Terms

1
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Is bond making endothermic or exothermic?

Bond making is exothermic because it releases energy

2
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Is bond breaking endothermic or exothermic?

Bond breaking is endothermic because it takes in energy

3
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State the formula for the enthalpy changes

ΔH = Energy used to make bond - energy released making bond

4
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What does it mean when ΔH is positive?

endothermic reaction, because it means energy was used to make bond

5
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What does it mean when ΔH is negative?

Exothermic reaction, because it means more energy was released