The change in the amount of reactants or products per unit time (normally per second).

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Rate (when reactants are in solution)

The change in concentration per second.

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Units of Rate

moldm-3s-1

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What does the gradient on a concentration/time graph represent?

Rate

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Rate Equation. What does m and n represent?

Rate=k[A]m[B]n m and n represents the order of reaction

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Square Brackets?

Concentration of...

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Rate Constant, factors effecting it

K, the bigger it is the faster the reaction, the higher the temperature the higher the value of K.

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Order of reaction

Shows the number of molecules of that reactant that are involved in the rate-determining step.

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Order= 0

[A] has no effect on the rate

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Order= 1

The rate is proportional to [A] e.g. if [A] doubles so does the rate.

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Order= 2

The rate is proportional to [A]2 e.g. if [A] doubles, the rate will be 4 times faster (2x2).

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Initial Rate of Reaction

The rate right at the start of reaction.

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How can you find the initial rate of reaction?

Using a concentration/time graph, draw a tangent to the curve when time= 0 and form a triangle. Gradient= change in y (verticle line)/change in x (horizontal line)

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Rate-determining step

The step with the slowest rate

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How do you know if a reactant affects the rate?

It will appear in the rate equation

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Other cards in this set

Card 2

Front

The change in concentration per second.

Back

Rate (when reactants are in solution)

Card 3

Front

moldm-3s-1

Back

Card 4

Front

Rate

Back

Card 5

Front

Rate=k[A]m[B]n m and n represents the order of reaction

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