GCSE Chemistry - Factors Affecting the Rate of Reaction #47

This video covers:
- Collision theory, and how it relates to the rate of reaction
- The effect of temperature
- The effect of concentration and pressure
- The effect of surface area
- The effect of catalysts

[@Cognitoedu]

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Amadeus & Tom

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How does temperature exceed activation energy when it decreases it in order to speed the rate of reaction?

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Would this be right , if the concentration gradient it higher the rate of reactions increases

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[@sumehrasaif9028]

Hi um just wanted to know, in your video, how will increasing the collision frequency increase the number of successful collisions if the reactant particles do not collide with activation energy?

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instead, the catalyst finds an alternative path which uses lesser energy and still make successful collision

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Hi Wais! We’re doing all the double award stuff first, but we will be moving on to the triple award stuff afterwards. Unfortunately that won’t be finished after the 2019 exams. Sorry about that!

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[@ruthiethemagmacube5390]

2:40 why are concentration and pressure the same? How are they both represent the number of particles per unit volume? I know that pressure of a gas shares an inverse relationship with volume (PV, Boyle’s law). But it shares a direct relationship with temperature (V/T, Charle’s law). Doesn’t that mean that the temperature can increase the pressure WITHOUT changing the number of particles per unit volume (in a closed system)?

[@ruthiethemagmacube5390]

Oh wait, is that because we’re looking at concentration and pressure at a constant temperature?

[@merlynvarkey1891]

here, they are being thought of as the same thing. when you increase the pressure in say, a liquid container, the volume decreases, and consequently the concentration increases, meaning the reaction rate increases therewith.

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Gas fills the container, more pressure is required as it loses pressure as its spread in a bigger container

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[@Hello-by1fl]

Sir, I just had a question: does increasing these factors increase yield as well?

[@fergusclark8854]

Hello 333 yes as it is more efficient meaning there will be less particles not used up.

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[@fergusclark8854]

Hello 333 wait this doesn’t make sense, I apologise. It doesn’t affect the percentage yield as the reaction is the same and the products being produced are the same, only quicker. Sorry.

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Hi, yeah like Linaysha said, companies normally want to speed up reactions to make them more profitable. But sometimes we may want to slow reactions down to e.g. we put food in the fridge to slow down the chemical reactions that break down our food.

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