Reaction Rates Using Moles (AQA GCSE Chemistry Combined Science): Revision Notes
📚 Revision Notes
6.1.2 Reaction Rates Using Moles
What is a Mole?
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A mole is a unit we use in chemistry to count a large number of particles, like atoms or molecules, in a substance. It's similar to how we use "dozen" to count 12 things, but a mole counts a much larger number—about 6.02 × 10²³ particles!
Measuring Reaction Rates with Moles:
Sometimes, instead of measuring how much of a substance is used or produced in grammes or cubic centimetres, we measure it in moles. This helps us understand the reaction on a particle level.
- You can calculate the mean rate of reaction using moles with a formula, just like with grammes or cubic centimetres:
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or
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- The unit for this rate of reaction is mol/s, which tells us how many moles of reactant are used or product is formed per second.
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Why Use Moles? Using moles is helpful when you want to think about the number of particles involved in a reaction. By counting particles, you can get a better idea of how the reaction works at the molecular level, which is especially important in chemistry.