Collision Theory, Activation Energy and Catalysts

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7 Terms

1

what is the collision theory

chemical reactions can occur only when reacting particles collide with each other and with sufficient energy

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2

what is the activation energy

the minimum amount of energy that particles must have to react

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3

how can you increase the frequency of collisions

Increasing the:

-concentration of reactants in solution,

-the pressure of reacting gases,

-and the surface area of solid reactants

increases the frequency of collisions and so increases the rate of reaction.

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4

how does temperature increase the rate of reaction (hint: energetic)

Increasing the temperature increases the frequency of collisions and makes the collisions more energetic, and so increases the rate of reaction.

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5

what are catalysts

Catalysts are substances that speed up chemical reactions without being changed or used up during the reaction.

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6

what are enzymes

Enzymes act as catalysts in biological systems

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7

how do catalysts increase the rate of reaction

● Catalysts decrease the activation energy; this increases the proportion of particles with energy to react.

● Catalysts provide a different pathway for a chemical reaction that has a lower activation energy.

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