■ Rate of reaction
► | The change in amount of reactant or product against time. |
► | A reaction that happens quickly and take a shorter time to complete. | ||||||||||
► | Examples:
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► | A reaction that happens slowly and take a longer time to complete. | ||||||||||
► | Examples:
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Measuring Rate of Reaction
■ Definition of rate of reaction: the change in the quantity of the reactants or products per unit time.
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► | Change in the quantity of the reactants per unit time. |
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► | Change in the products per unit time. |
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► | Average rate of reaction: the average rate that occurs in a given period of time.
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► | Instantaneous rate of reaction: the rate of reaction at any given time.
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► | The animation below shows the calculation method of average and instantaneous rate of reaction by using graph.
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► | The animation below shows the rates of reaction at different points.
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Laboratory Activity 1.1.1: Measuring Rate of Reaction |
Worked Example : Measurement of Rate of Reaction
✍ Worked-example 1.1(a) In an experiment, 5.0 g of calcium carbonate will need 250 seconds to react with excess dilute hydrochloric acid. Calculate the average rate of this reaction in the unit of:
Solution:
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✍ Worked-example 1.1(b) In an experiment, granulated zinc is added to dilute hydrochloric acid. The gas evolved is collected in a burette. Volume of gas collected is recorded at intervals of 20 seconds. The following table shows the results obtained.
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