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

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

Opposing

If forward reaction is exothermic, backward is?

Endothermic

If forward reaction is endothermic, backward is?

Exothermic

Exothermic reaction definition

Transfers energy to surroundings (usually heat)

Why exothermic reactions release energy

More energy released forming bonds than absorbed breaking them

Endothermic reaction definition

Absorbs energy from surroundings

Why endothermic reactions absorb energy

More energy needed to break bonds than released forming them

H2+I2→HIH_2 + I_2 \to HI forward reaction energy type

Exothermic

Why is H2+I2→HIH_2 + I_2 \to HI exothermic?

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

HI decomposition to H2H_2 and I2I_2 energy type

Endothermic

Why is HI decomposition endothermic?

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

Energy change of reverse 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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