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  7. Unit 16 - Kinetics II (WCH14)

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Summary A Level Chemistry - Further Kinetics (Part 1)
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This document provides an in-depth and extensive summary for further kinetics in chemistry. The points explored in this topic are the order of reaction and rate equations, the selection of appropriate technique to follow the rate of a reaction and initial and continuous rate techniques for followin...

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  • August 29, 2023
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  • 2023/2024
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A Level Chemistry – Further Kinetics (Part 1)


• The rate of a reaction can be determined by following the
formation of a product over time:

𝑐ℎ𝑎𝑛𝑔𝑒 𝑖𝑛 𝑐𝑜𝑛𝑐𝑒𝑛𝑡𝑟𝑎𝑡𝑖𝑜𝑛 𝑜𝑓 𝑝𝑟𝑜𝑑𝑢𝑐𝑡
𝑟𝑎𝑡𝑒 =
𝑡𝑖𝑚𝑒

Unit of rate is 𝑚𝑜𝑙 𝑑𝑚−3 𝑠 −1 .


• Rate of reaction can be followed using various monitoring
methods:

1. Volume of gas evolved.
2. Change in mass.
3. Change in intensity of colour (colorimetry).
4. Change in concentration of product or reactant through
titration.
5. Change in pH of a solution.
6. Electrical Conductivity.



• A first order rate equation is where rate is directly proportional
to concentration. This can be expressed as:

𝑅𝑎𝑡𝑒 = 𝑘[𝐴]

where 𝑘 is the proportionality (rate) constant.



• A second order rate equation is when the concentration is
doubled, the rate increases by a factor of four:

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