122_BLB9_14_V1_full

122_BLB9_14_V1_full - Chapter 14 Chemical Kinetics Reaction...

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Chapter 14 Chemical Kinetics
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• Speed of a reaction is measured by the change in concentration with time. • For a reaction A B • Suppose A reacts to form B. Let us begin with 1.00 mol A. Reaction Rates Reaction Rates () t = = B of moles in time change B of moles of number in change rate Average
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Reaction Rates Reaction Rates
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–A t t = 0 (time zero) there is 1.00 mol A (100 red spheres) and no B present –A t t = 20 min, there is 0.54 mol A and 0.46 mol B –A t t = 40 min, there is 0.30 mol A and 0.70 mol B – Calculating, Reaction Rates Reaction Rates ( ) () ( ) mol/min 026 . 0 min 0 min 10 mol 0 mol 26 . 0 min 0 min 10 0 at B of moles 10 at B of moles B of moles rate Average = = = = = =
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B there are two ways of measuring rate: – the speed at which the products appear (i.e. change in moles of B per unit time), or – the speed at which the reactants disappear (i.e. the change in moles of A per unit time). Reaction Rates
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122_BLB9_14_V1_full - Chapter 14 Chemical Kinetics Reaction...

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