# Kinetics (Unit 4)

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Reaction Rate
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)

moldm-3s-1

Rate

### Card 5

#### Front

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

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