Unit 5: Module 1 - Rates, Equilibrium and pH (F325)

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Rate of reaction
The change in concentration of a reactant or product per unit of time.
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Units of rate
mol dm^-3 s^-1 (concentration/time)
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Initial rate of reaction
The change in concentration of a reactant or product per unit of time at the start of the reaction, when T=0.
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Rate equation for a reaction A + B -> C
Rate = k[A]^m[B]^n ('m' is the order of reaction with respect to A, 'n' is the order of reaction with respect to B)
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Order with respect to a reactant
The power to which the concentration of the reactant is raised in the rate equation.
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Zero Order, rate ≈ [A]^0
Rate is UNAFFECTED by changing the concentration of A.
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First Order, rate ≈ [B]^1
If [B] increases by 2 times, the rate also increases by 2 times.
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Second Order, rate ≈ [C]^2
If [C] increases by 2 times, the rate increases by 2^2 = 4 times.
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Overall Order of reaction
The sum of the individual orders, m + n.
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Rate Constant, k
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.
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Other cards in this set

Card 2

Front

mol dm^-3 s^-1 (concentration/time)

Back

Units of rate

Card 3

Front

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

Back

Preview of the back of card 3

Card 4

Front

Rate = k[A]^m[B]^n ('m' is the order of reaction with respect to A, 'n' is the order of reaction with respect to B)

Back

Preview of the back of card 4

Card 5

Front

The power to which the concentration of the reactant is raised in the rate equation.

Back

Preview of the back of card 5
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