Rate of reactions

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9 Terms

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Activated Complex

Unstable intermediate formed during a reaction.

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Reaction Rate

Change in concentration per unit time.

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Catalyst

Substance that increases rate without being consumed.

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Collision Theory

Reactions occur when particles collide with enough energy.

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Chemical Equilibrium

Forward and reverse reactions occur at the same rate.

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Exothermic Reaction

Releases energy to the surroundings (ΔH < 0).

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Endothermic Reaction

Absorbs energy from the surroundings (ΔH > 0).

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Activation Energy (Ea)

Minimum energy needed to start a reaction.

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Heat of Reaction (ΔH)

Energy change during a reaction.