Reaction rates Flashcards

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1
Q

Activation energy

A

The minimum energy required to start a chemical reaction OR The energy required to form the activated complex.

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2
Q

Activated complex

A

A high energy, unstable, temporary transition state between the reactants and the products.

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3
Q

A catalyst

A

A substance that increases the rate of a chemical reaction but remains unchanged at the end of the reaction.

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4
Q

The reaction rate of a chemical reaction

A

The change in concentration per unit time of either a reactant or product.

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5
Q

Heat of reaction (ΔH)

A

The net change in chemical potential energy of the system. ΔH > 0 for endothermic reactions and ΔH < 0 for exothermic reactions.

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6
Q

Exothermic reactions

A

Reactions which transform chemical potential energy into thermal energy.

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7
Q

Endothermic reactions

A

Reactions which transform thermal energy into chemical potential energy.

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