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Meaning of a reaction rate and measurement of reaction rate with a worked example

Answer Text:
Reaction rate:
- The rate of a chemical reaction is taken as the rate at which products are formed or the rate at which reactants disappear.
Measurements of reaction rates
Reaction rates are measured in terms of
-How much product appears in a given time.
-How much reactant disappears in a given time
- Rates curves are then plotted
- These are plots of concentration or properties, which are functions of concentration against time


Apparatus used to determine rates of reaction
Examples:
- Reaction between dilute HCl and marble chips.
- This can be by:
(a). Measuring the decrease in mass with time
Apparatus:


Similar experiments maybe done using zinc granules andzinc powder with an acid