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Rate of Reaction
Measuring rate of reaction in an experiment
Colorimetery ­ the change in intensity of a colour in a reaction mixture with time, such as in
clock reactions.
Mass change ­ used when a gas is produced, the mass of the flask in which the reaction takes
place will decrease as the reaction happens.
Volume change ­ also used for gases, in which the released gas is measured using a syringe.…read more

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Consider: A + B + C products
The experiment is repeated with the concentration of A doubled, but the concentrations of B and C
stay the same,
If the rate does not change (20), the reaction is 0 order with respect to A
If the rate doubles (21), the reaction is order 1 with respect to A
If the rate quadruples (22), the reaction is order 2 with respect to A
The same applies to B and C when their concentrations change.…read more

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Homogeneous ­ same physical state as reactants
Heterogeneous ­ different physical state to reactants. Usually, a similar mechanism occurs in
almost all metal-catalysed gaseous reactions. The catalyst has active sites on its surface that
rapidly become saturated by reactants, which are then slowly converted into products.
These then leave the metal surface, allowing more of the reactant to be absorbed. This
means the rate of a reaction is not altered by an increase in pressure of the gaseous
reactants.…read more


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