Energy Changes & Reversible Reactions (AQA GCSE Chemistry Combined Science): Flashcards

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Energy Changes & Reversible Reactions
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Energy changes in reversible reactions (forward vs backward)

Opposing

If forward reaction is exothermic, backward is...

Endothermic

Exothermic reaction definition

Transfers energy to surroundings, usually as heat

Why exothermic reactions release energy (bonds)

More energy released forming bonds than absorbed breaking them

Endothermic reaction definition

Absorbs energy from surroundings

Why endothermic reactions absorb energy (bonds)

More energy needed to break bonds than released forming them

H2H_2 + I2I_2 → HIHI forward reaction energy type

Exothermic

Why H2H_2 + I2I_2 → HIHI is exothermic

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

HIHI → H2H_2 + I2I_2 backward reaction energy type

Endothermic

Why HIHI decomposition is endothermic

More energy needed breaking H-I bonds than released forming H-H & I-I

Energy change of reverse vs forward reaction

Always opposite

If forward reaction is endothermic, backward is...

Exothermic

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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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