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20 Cards in this Set
- Front
- Back
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What is meant by the term 'Initial rate of reaction'?
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The cnange in concentration of a reactant, or product per unit time at t=0.
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Define 'rate of reaction'
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Change in concentration of a reactant or product per unit time.
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How would you calculate the rate of a reaction from a concentration / time graph?
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Draw a tangent to the line at the given time, and work out the gradient. The answer will be in moldm-3s-1
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What is the rate equation for
A + B --> C if it is first order with respect to A and B? |
Rate = k[A][B]
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How do you calculate the overall order of reaction of a reaction?
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Add up the powers on the concentrations from the rate equation.
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Define k, the rate constant
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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.
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What is 'half life'?
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The time taken for the concentration of a reactant to reduce by half.
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What is meant by the term 'rate determining step'?>
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The slowest step in a reaction
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What is a heterogeneous equilibrium?
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An equilibrium in which all the species making up the reactants and products are in different physical states.
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What is a homogeneous equilibrium?
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An equilibrium in which all the species making up the reactants and products are in the same physical state.
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In Kc calculations, under what circumstances can you cancel out the volume of solution?
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If Kc has no units.
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What effect does pressure have on Kc?
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None
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What effect does a catalyst have on Kc?
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None.
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What effect does temperature have on Kc?
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If temp increases and the forward reaction is endothermic, then Kc will increase. If the forward reaction is endothermic, then Kc would decrease with an increase in temperature.
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What can you work out about the rate equation from the balanced equation.
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Nothing. The rate equation is produced using experimental data only.
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Define an acid
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Proton donor
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Define a base
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Proton acceptor
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What is an alkali?
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A base that dissolves in water forming OH- ions in solution.
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What is an acid-base pair?
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A pair of two species that transform into each other by gain or loss of a proton.
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Define pH
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pH = -log[H+]
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