# Rate of reaction and definitions

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The change in concentration of a reactant or product per unit of time
Rate of reaction
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As a reaction proceeds, concentrations of the reactants decrease and therefore fewer collisions take place per second between reactant particles
Rate slows down
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You can measure the slope, and therefore the rate, by drawing a tangent and calculating
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The change in concentration of a reactant, or product, per unit time at the start of the reaction when t=0
Initial rate of reaction
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Rates can be measured involving acids or bases by a) titration
b) pH probes
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The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation
The rate constant, k
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The rate is unaffected by a change in concentration, which order?
Zero
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If the order is ____ then rate is directly proportional to [reactant]^1
First
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If the order is _____ then rate is directly proportional to [reactant]^2
Second
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The time taken for the concentration of the reactant to be reduced by half
Half life
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For zero order reactions, half life
Decreases with time
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For second order reactions half life
Increases with time
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For first order reactions half life
Remains constant
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A reaction mechanism is
A series of steps that altogether make up the overall reaction
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The rate determining step is
The slowest step in the reaction mechanism of a multi step reaction
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## Other cards in this set

### Card 2

#### Front

As a reaction proceeds, concentrations of the reactants decrease and therefore fewer collisions take place per second between reactant particles

Rate slows down

### Card 3

#### Front

You can measure the slope, and therefore the rate, by drawing a tangent and calculating

### Card 4

#### Front

The change in concentration of a reactant, or product, per unit time at the start of the reaction when t=0

### Card 5

#### Front

Rates can be measured involving acids or bases by a) titration