GCSE Chemistry Revision "Temperature and reversible reactions"

[@mupetanjebele7148]

Life saver. Never struggled so hard to understand a topic before.

[@shauryajain6490]

frrr

[@imaanrichardson9823]

samee

[@eviehooper7977]

I literally can’t thank you enough for what you do. You need a medal! You have such a beautiful soul and I hope your channel grows and goes far. Always remember that if you do good it will repay you and good things will come your way. All the best for the future, thank you :)

[@infernalspy0176]

Dude, you saved my life. We have mocks for GCSEs soon and due to corona we missed a bunch of lessons, and now we have to rush a lot of topics. I understood more in 4 minutes that 2 hours worth of lessons. #respect

[@rk3340]

Fr we do double lessons of chemistry to learn a topic that can be explained in a 4 minute video

[@wilfiesheehan5905]

Why have you stopped doing that smile at the end please can you keep doing it

[@mr.electro4674]

he hasn't, it's just more subtle

[@PhoenixMario]

@@mr.electro4674 You're right

[@abdur9918]

YOU ARE SOO MUCH BETTER THEN 90% SCHOOL TEACHERS

[@Willk404]

You’re once again carrying my entire gcses tysm

[@sammosully1909]

So, if you increase the temperature, equilibrium will shift to the left. This is because the left reaction is endothermic, Energy is taken in which results in the temperature decreasing. However if you decrease the temperature of the reaction, equilibrium will shift to the right, and because the reaction is exothermic to the right, energy is released into the surroundings, so the temperature increases to reach equilibrium Thank you Dr Donnelly, I finish my GCSEs in less than a week so I want to thank you for all your hard work making these videos.

[@charliebrett7510]

Thank youuuu!!!! So basically if you increase the temp the equilibrium will move to the left to favour the endothermic reaction (does opposite) and if you decrease temp it will move to right to favour exothermic reaction. So what about if the forward reaction was endothermic? And you increased the temp the equalibruim would go to the right still to favour the endothermic reaction? And if you decreased the temp the equalibruim would move to the left to favour the exothermic reaction?

[@siamulislam8213]

YES

[@sixeleven637]

Oh my god this guy is actually insane i learn way too much from him in 3 mins

[@aimeecurtis2221]

Watched this about 5 times but I think I finally get it

[@yinngan9732]

thank you thank you so much, my school's notes only explains about increasing the temp but not the other way so thank you so much for all the videos :)

[@jacobdavies3133]

Who else likes even tho there’s no number of likes

[@tch.hairband3178]

We love when your teacher can't be bothered to teach you so they just send u the link to this video and force you to watch it :/

[@sadlennie9320]

Yeah lol, at least I’m learning from the best lol

[@jakeevans4175]

It’s probably better than what they could do, maybe you should listen to this guy he is saving everyone’s gsces

[@phase0400]

Would you prefer the alternative? Some comments are like they want my teacher is bad and we should just watch this legend. You on the other hand have got like a wish granted from people and cant accept to watch FreeSciencelessons.

[@days5345]

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[@fredweasleysbae1006]

You are a literal lifesaver thank you so much for your videos

[@MizanurRahman-rl1ic]

Thank u sir, You are a great guy....

[@imaanrichardson9823]

Explained this way better then my teacher did Thank you so much

[@luna-xq9mz]

THANK UUU U SAVED ME FROM READING A 3-PAGE EXPLANATION

[@oasis4520]

Never found a mistake ever except on this occasion at 1:40 you said although some reversible reactions are exothermic one way and exothermic in the opposite direction. But as I said carnt fault you keep it up. 💯💯

[@Freesciencelessons]

Hi. No I say that some reactions are exothermic in the forward direction and some (ie different reactions) are exothermic in the reverse direction.

[@sanzusbbl9844]

you need an award for saving us

[@dutchvanderlinde8724]

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[@Tumtetums]

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[@ghadaadam2766]

Wonderful video. Thank you very much for your effort 👍

[@jamstrr]

I like your tie

[@yasauro]

Thank you, once again

[@georgina9237]

I love your channel so much!!

[@zuzannachojecka8736]

Endothermic and exothermic reactions have always confused me. What I don't get is: if in an endothermic reaction heat energy is taken in, shouldn't that make the surroundings colder but the system warmer as it has gained heat? Same with an exothermic reaction: if heat energy is being released wouldn't that make the surrounding warmer as it is being released into the surroundings but the system would get colder as it has lost that heat?

[@Freesciencelessons]

Exothermic reactions do make the surroundings warmer and endothermic reactions do make them cooler. We don't measure the temperature of the system, just the surroundings.

[@zuzannachojecka8736]

Freesciencelessons But the video said that in an endothermic reaction energy is taken in and temperature of the system decreases, that’s what confused me 🤔

[@Freesciencelessons]

In the case of reversible reactions, the word system refers to the reaction and its surroundings as if they were in a sealed container. Imagine a reaction taking place in a sealed container (the system). If the reaction is exothermic, then the temperature of the system will increase as energy has been released into the system from the reaction. And vice versa with endothermic reactions.

[@user-wb6so8mu6q]

Thank you soooo much for explaining this I had the exact same question

[@erenyeager6668]

@@Freesciencelessons so is the system and the reaction two different things, if the reaction is exothermic then then the systems temperature increases and if its endothermic the systems temperature decreases,

[@AmjadShah-i7e]

Can you please explain activation energy and CATALYST...

[@bendoy4555]

Legend

[@EvelynSebastian-b7z]

Still trying to understand this. If you give heat something (supply energy) how does the temperature decrease??????????

[@Freesciencelessons]

Because the reaction shifts to favour the direction which is endothermic (ie takes in energy). This causes the temperature to fall.

[@ahnafhameem6010]

Thank You soo Much helped me a lott

[@SLSERIES]

Haloo🤭😂

[@Worldfxx]

you're the BEST

[@tristanbuswell7]

Freesciencelessons, Fantastic videos you`re making. I`m learning a lot from these short and simple videos! Quick question, do you know the exact date for the workbook? I would like to start working on these questions as soon as possible so that i`m ready for the 2018 GCSE`s. Also is the workbook for free online? please message back, i would be very thankful if you do :)

[@Freesciencelessons]

Hi. The workbooks will be gradually issued once I've done the videos so I can't give you an exact date. They won't be free but they will be very cheap.

[@tristanbuswell7]

Ok thank you very much for you reply :)

[@oakwood2371]

Hi! I'm struggling to understand what 'equilibrium shifts to left/right' actually means. I understand that 'left' refers to reactants and so on, but when you say equilibrium shifts to the left, what does that mean? thanks :)

[@Freesciencelessons]

Hi. I'm sorry for the very late reply. When I say "the equilibrium shifts to the left", what I mean is that when the reaction reaches equilibrium, there will be a greater proportion of reactant in the final equilibrium mixture than before. This only occurs when we change temperature.

[@oakwood2371]

@@Freesciencelessons ohh thank you, this makes a lot of sense.

[@khalid-zo8xm]

Great vid could you do a video on disease

[@aqsaarfan7550]

when will you be doing the paper 2 revision for science in gcse 9-1?

[@FlixRacing]

Thank you❤🎉

[@ysobelfear3467]

Wish my teachers at school explained as well as u xd

[@suzzeth5577]

Understand now 🥳🥳🥳

[@kvngsimon]

Didn't understand shit before this Exam saver my guy

[@---rq8nw]

Thanks for this video! Helped loads, but one thing im confused on is: if its a change in temperature, will the forward reaction always be exothermic and reverse one endothermic? If no, and its the opposite, do the same principle still apply?

[@goonerstv3818]

He said that exothermic reaction can be forward or backward reaction. The important thing to know is if temperature is increased, then the equilibrium shifts to the opposite one trying to lower the temp.

[@evelloyd8852]

im confused at why the temperature increases in the endothermic direction and then shifts left? why does it shift to the left? idk if that made sense either.

[@loredfolk1069]

What exactly causes 2NO2 to increase and the yield of n2O4 to decrease? Because i get that it does the opposite, but i dont get how it decreases the amount.

[@jesan2588]

Starts at 1:50

[@sivaramsivanantharajah1586]

@freesciencelessons would you say your videos cover the spec in enough detail to get me the 8/9

[@mouferhecker6423]

sivaram sivanantharajah of course You just have to put in the effort other than watching these videos

[@Mk-hc9jm]

Yes

[@nosir1479]

1:10 If the energy is released, why does the temperature of the system increase? Surely if you're releasing energy, you're giving out energy- it is decreasing so surely the temperature of the system would decrease as well?

[@Freesciencelessons]

The energy is released from the reacting chemicals to their surroundings (which is water if the chemicals are in aqueous solution). Because the surroundings have gained energy, the temperature of the surroundings increases.

[@jamesmitchell4343]

Love this guy!

[@sf_0160]

When energy is taken in doesn't that mean it gets hotter since it is acquiring energy?

[@dims3000]

@@myselfandme2492 legend

[@an5i910]

1:33 how does an endothermic reaction decrease the temperature of the system? and vice a versa

[@Rasool.]

endothermic is gonna take in energy so thermal energy which reduces the temp exothermic is gonna release energy to surrondings in the thermal store so the temp increases 😭3 months late to reply hopefully its useful

[@haruhi_dayo]

Freesciencelessons: some students may find this difficult and need to watch this a couple times Me: watch me triple that couple of times

[@louisearnshaw8749]

where should i start for watching all your vids?

[@Freesciencelessons]

Pick the subject that you like the most and go to the front page of my channel. You'll see there the Biology, Chemistry and Physics sections. Watch the videos in that section. That way, because you know you like that subject, you'll be more likely to watch. Then when you decide that the videos are for you (incase you don't like them), I'd recommend watching a subject that you don't like so much.

[@mr.electro4674]

what about this effect on the contact process

[@DaBlob69]

👍

[@omarmurad1451]

Where can I find the revision workbook?

[@l3g3nd61]

Sir...I don’t know if I’m wrong but have you covered Nitrate Deficiency and Magnesium deficiency as we have been learning that.....if you don’t mind please could you put the link

[@Freesciencelessons]

Here's what you need: GCSE Biology (9-1) Plant diseases 2

[@l3g3nd61]

Freesciencelessons thanks got my exam in an hour or so on biology

[@eugeneochieng9245]

So sir what if the forward reaction would be endothermic ,so what happens when temperature is increased or reduced they are confusing me

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[@jakubzielinski4342]

Are you going to do A level physics

[@cryptomagicien6907]

What is the main fact to remember

[@Bivolw1082]

Learn about temprature in a rev reaction

[@abdullaalabdulghani9655]

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[@Eyebroooo]

who is that?

[@agnesmak9285]

What does he meant when he said “ the equilibrium shift to the forward reaction ?”

[@liv-we1ty]

Agnes Mak it means the equilibrium favours the forwards reaction, so more product is made

[@xx_1dreamstanlegend_xx422]

Well, I think the meaning would be more clear if you re-watched the video.

[@mehsen3703]

Excuse me sir, when will the paper 2 topics be discussed?

[@Freesciencelessons]

I'm already uploading the Chemistry paper 2 videos and then I'll go on to Biology and Physics.

[@lambchops7298]

Could anyone explain what is meant by “system”

[@Freesciencelessons]

Hi. Essentially it's the idea of a sealed container, stopping any of the reactants or products from escaping. We call that the system.

[@fatimaalsahlani9400]

Are we supposed to know the temperature of the surroundings or the system??

[@Faith-zp5kf]

When they say temperature my teacher said they are referring to the temp of the surroundings

[@sarriaabdallah9069]

Hi where can I find the revision workbook

[@tanekillz1958]

Link in the description

[@jingyi3997]

Can someone explain to me why at 2:43 it’s N2O4 increase and NO2 decrease?

[@proudchristian9873]

im late but since the temperature decreased. The equilibrium HAS to shift to the right to increase the temperature so the system to counteract the change. N2O4 is on the right and since its shifting to the right it will increase more but the NO2 is going to decrease since the equilibrium is moving to the right. Hope this helps.

[@jamesford8635]

can anyone help me? I don't understand what it means if the equilibrium moves in favour of the reaction producing fewer gas molecules... what does in favour mean?

[@fireemperorzuko8756]

It means more of that will be produced e.g. the state of equilibrium will favour sodium carbonate, this means more sodium carbonate will be produced.

[@a.h6483]

Hi sir, I am a bit confused on what is meant by equilibrium being the left or right. For example, if equilibrium is on the left what does that actually mean in terms of the reactants and products? Thanks.

[@Freesciencelessons]

If the equilibrium is on the left, then we will have more reactants in our mix than products. If it's on the right, then we have more products than reactants. Hope that helps.

[@Aestheticallyours-hk2yu]

Sir when you would do paper 4 revision??

[@minas9393]

I'm late but this is for aqa, I think. There's no paper "4".

[@youareguacbbygurl1743]

I'm Still confused

[@cosmiceraser]

haha lol i understood the effect of change in temperature in equilibrium watching it once, get good noobs

[@0penplays268]

Listen to the opening theme at 1.5x speed. I cringed so much

[@antoniadarling5451]

I'm confused! I thought exothermic reactions released energy, meaning the reaction would decreases in temp. Can someone explain why the temp increases when its exothermic?

[@ketchurself7979]

@@Name7.62 thanks for explaining that to me. What grades are you aiming for in science? i am aiming for 8/9 in all of them.

[@dayagill3199]

loml

[@originallegendz8325]

1.40 In you made a mistake xD, you said some are exothermic in forward direction and some are exothermic in backwards direction xD. I know you ment endothermic

[@Freesciencelessons]

Hi, no I meant to say that. What I meant is that some reactions are exothermic forwards and some reactions are exothermic backwards. It just depends on the reaction.

[@originallegendz8325]

Freesciencelessons ahh thx man!

[@xx_1dreamstanlegend_xx422]

Wtf? 'I know you ment endothermic', why do you think you know that? You sound so ridiculous at that point.

[@MizanurRahman-rl1ic]

He said exothermic on purpose 'cause that was true...