Kinetics

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  • Created by: r98
  • Created on: 19-03-16 12:34
What are the main factors that affect the rate of reactions?
Temperature, concentration, pressure, surface area and catalysts.
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What's the definition of rate of reaction?
The change in concentration (of any of the reactants or products) with unit time.
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How do you find the rate at a particular instant?
Draw a tangent to the curve at that time and then find its gradient (slope).
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Why do we have to keep the temperature constant when measuring rate of reaction?
Because rate varies with temperature.
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What are the units of reaction rates?
mol dm-3 s-1
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Can a species thats not in the chemical equation appear in the rate equation?
Yes, for example a catalyst.
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Is the rate constant, k, different for every reaction?
Yes.
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What does k vary with?
Temperature.
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What happens when all the species in the rate equation are 1 mol dm-3?
The rate of reaction is equal to the value of k.
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What's the order of reaction?
The order of reaction, with respect to one species, is the power to which the concentration of that species is raised in the rate expression.
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What does the order of reaction tell you?
How the rate depends on the concentration of that species.
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Do all species in the chemical equation appear in the rate equation?
No, not necessarily.
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Do the coefficience of species in the chemical equation have any importance in the rate expression?
No, they have no relevance.
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What are the units of the rate constant, k?
The units of the rate constant vary depending on the overall order of the reaction.
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Increasing temperature always increases what two things?
The rate of reaction & the value of the rate constant, k.
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Do steps that occur after the rate-determining step affect the rate?
No, provided that it's fast compared with the rate-determining step.
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Do species that are involved in the mechanism after the rate-determining step appear in the rate expression?
No, only species involved in or before the rate-determining step could affect the overall rate and therefore appear in the rate expression.
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Other cards in this set

Card 2

Front

What's the definition of rate of reaction?

Back

The change in concentration (of any of the reactants or products) with unit time.

Card 3

Front

How do you find the rate at a particular instant?

Back

Preview of the front of card 3

Card 4

Front

Why do we have to keep the temperature constant when measuring rate of reaction?

Back

Preview of the front of card 4

Card 5

Front

What are the units of reaction rates?

Back

Preview of the front of card 5
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