GCSE Chemistry - Factors Affecting the Rate of Reaction #47

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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This is so awesome!!! My teacher took a month to explain rate of reaction but you taught within I guess 10-19 minutes because of your other videos on Rate of Reaction!! Thank youuuuu it was so helpful!

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Its 5 min...haven't you been listening

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@@meskeremtadesse163 They're taking the other Rate of Reaction videos into account.

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Ah thankyou so much Minyong, we really appreciate your support 🤩 Well done on your assignments 🥳

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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.

[@devsehgal7432]

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.

[@Hello-by1fl]

@@fergusclark8854 Thank you so much☺

[@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.

[@Hello-by1fl]

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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?

[@amirthamramasamy50]

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

[@abnormal3720]

thank you sir once again

[@irajgotloggedout]

man i dont get this

[@-.kikuchiyuka6353]

Ok the whole point of this is that for a reaction to occur you need the particles (imagine little balls floating or idk orbitz) to collide, like cars collide but in this case, particles, to form a reaction. Each reaction has a different time of when it occurs, and the time is basically called "rate of reaction" how much it takes to react reactants, and you can increase the speed at which a reaction happens by > increasing the number of collision particles and effective collision particles, and how do you do that? Using these 5 points in the video. 1) temperature: as temperature increases, the speed of the particles moving randomly would increase which increases the chance of it colliding, and also might increase the chance of effectively doing so (reaction occurring) 2) concentration, think about it as it was a 8 ball pool game. The more balls you have on the table, the easier it is for them to collide, well, the lesser you have the harder it is for them to collide. So the higher the concentration (amount of particles/or something else), the number of particles colliding would increase and increase the chance of effectively doing so. 3) surface area, you have a cube of sugar like in these old movies vs the normal powder like sugar you have at home, which has a higher surface area/occupies more space on the floor or wherever u have it? The powder. So this is gonna help the reactant react with the other reactant as you're spreading the reactant as peanut butter and making it more open for collision to occur. Lastly is a catalyst is just a substance that might make the reaction process more quick and shorten the amount of energy needed to break bonds thus forming new ones. That is just a brief re cap of everything, if you do not understand the best thing you can do is ASK.

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You're saving lives

[@Kyle-ik3cf]

Hi! Can I ask a question? why is there a need to control the rate of some chemical reactions?

[@hyacinth18]

im not sure about controlling, but in terms of speeding up a reaction, I think that it is useful when scientists want to increase the speed of a reaction to like save time? I'm not too sure

[@Cognitoedu]

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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[@aeizaashar8522]

i wanted to ask u something if concentration of reactant is directly proportional to rate of reaction why do we say that the rate of an enzyme catalyzed reacripn is independent of the substrate concentration

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Science is so fun!

[@sharminaparveen3567]

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

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Hi are you guys only doing videos the double award content? Or will you be doing triple as well?

[@Cognitoedu]

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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oh okay thank you

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Hello Cognito , Can I know whether does this cover The syllabus Of Cambridge International examination Zone 4 GCSE (5070) Chemistry With paper Varients Of 12 22 42

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

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