Energy Changes & Reversible Reactions (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Energy Changes & Reversible Reactions
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Energy changes: forward vs backward reversible reactions

Opposing

If forward reaction is exothermic, backward reaction is?

Endothermic

If forward reaction is endothermic, backward reaction is?

Exothermic

Exothermic reaction definition

Transfers energy to surroundings (usually heat)

Why do exothermic reactions occur? (bond energy)

More energy released forming bonds than absorbed breaking them

Endothermic reaction definition

Absorbs energy from surroundings

Why do endothermic reactions occur? (bond energy)

More energy needed to break bonds than released forming them

H2H_2 + I2I_2 → HIHI energy change type

Exothermic

Why is H2H_2 + I2I_2 → HIHI exothermic?

More energy released forming H-I bonds than breaking H-H, I-I bonds

HIHI → H2H_2 + I2I_2 energy change type

Endothermic

Why is HIHI decomposition endothermic?

More energy to break H-I bonds than released forming H-H, I-I bonds

Energy change of reverse reaction vs forward reaction

Always opposite

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Rate of Reaction

Reversibility & Equilibrium

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Rate of Reaction

Reversibility & Equilibrium

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Rate of Reaction

Reversibility & Equilibrium

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Rate of Reaction

Reversibility & Equilibrium

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