Chemistry Regents Unit 9

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9 Terms

1
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Collision theory

reaction is most likely to occur if particles collide with proper energy and orientation

2
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At equilibrium, the rate of forward reactions and reverse reactions are ____

the same

3
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Heat of reaction

PE of the products - PE of the reactants

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Positive heat of reaction

endothermic

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Negative heat of reaction

exothermic

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Catalyst

lowers activation energy

7
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Entropy

measure of randomness or disorder in a system

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Systems in nature tend towards lower ____ and higher ___

energy, entropy

9
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Exothermic reactions that result in increased entropy are ______

spontaneous