Equilibrium Constant Kp | A level Chemistry | Explained
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- Опубліковано 6 вер 2024
- Equilibrium Constant, Kp.
A level Chemistry Explanation Video.
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Equilibrium & Le chatelier:
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Equilibrium Constant Kc:
• Equilibrium Constant, ...
00:05 Intro
00:31 Dynamic equilibrium
01:53 Equilibrium Constant
02:53 Kp vs Kc
03:53 Partial Pressure
05:49 Kp Expression
09:13 Units of Kp
12:03 Calculating Kp 1
13:05 Calculating Partial Pressure
16:17 Le Chatelier's Principle & Kp
20:51 Calculating Kp 2
25:41 Different Kp calculations
29:46 Kp advice and tips
your videos are literally the best and i’ve been using them to help solidify yr12 content but starting year 13 i was worried as you only seemed to have year 12 content explanations so this is great for future study sessions!
Thank you for the feedback, I'm glad they're useful!
Yes, I'm working on releasing as much y13 as possible this year 😃
of course, no problem! and i’m glad to hear that, thank you so much for what you do honestly☺️
Amazing video as always. Your talent in explaining chemistry concepts is very much appreciated! Thank you very much sir.
Very grateful for your feedback 🙏
I have a few question and things to clarify.
We always have to balance the equations we get given in the exam right? (This would apply to all equations no matter the topic right? Including for kp) In order to have the correct coefficient right?
Also is the difference in the way we calculate at 14:21 and 21:02
That in 14:21 they would give us the moles at equilibrium for all the chemicals - (so the only thing to work out is the mole fraction and then use that to work out the partial pressure)
And that at 21:02 they would give us the initial moles for some chemicals and the moles at equilibrium for another chemical and we use this information to work out the moles at eqm using the ICE format?
(And of course finish the question by working the mole fraction and partial pressure of the chemical they’re asking for)
If this is the case, for kp calculations it’s essential to make sure that we know if they’re giving the moles at eqm for ALL chemicals (in which we follow the format you gave at 14:21)
Or if some moles are the initial moles and and some are moles at eqm (So that we can use the data to find the moles of each chemical at eqm right?)
So the most important thing is to work out the moles at eqm right?
Everything you've said makes perfect sense 👌
To reassure you, I don't think I've ever seen a balancing question come before an equilibrium constant calculation, as there would be too much riding on it.
Absolutely right about the 2 different methods. You can often infer which it is from the number of marks. More marks means more likely you're using ICE as well.
Also, fewer marks (and maybe they don't give you a total pressure) means that you might be fine just using mole fraction. This would be the case if there were the same moles on both sides of the equation
About the balancing equations, I was asking about this because I was doing a Kp question and it said 0.460 moles of SO2 is mixed with 0.250 moles of O2 and it said eqm is reached at a pressure of 215kPa and the mixture had 0.180 moles of SO3
In this case to work out the moles at eqm of SO2 and O2 isn’t it important that I put 1/2 infront of the O2? Because the initial mole of SO3 is 0 and at eqm it’s 0.180 and since it’s (1/2O2)the moles at eqm of O2 would be 0.16 (as it would be half of 0.180 which is 0.09 and it would be that value take away the initial mole- which was 0.250) - and SO2 since there’s no coefficient and it’s just 1- it would be 0.460 - 0.180 (so mole at eqm for it would be 0.28)
So although they may not ask to balance the equation as a question wouldn’t I still need to make sure to balance it?
(The question was to work out the partial pressure of SO2 and it was 4 marks.)
Also sir could you please explain the last part you mentioned.
As in if the question doesn’t give the total pressure, (because there’s an equal number of moles on both sides) and we can just use mole fraction. What exactly would they be asking us to work out? Would it be the value of Kp or something else? I didn’t fully understand what the question would ask us to work out and what steps we would do to work it out.
@nishatjeonkim2096 yes, I see what you mean now. You definitely need the coefficients from the balanced equation for the example you describe. I'm surprised they didn't give you an equation to use!
Yes, that's exactly it. The focus of my example would be a value for kp
@@chemistrytutor Yeah after checking the mark scheme and trying to figure out where I went wrong I finally realised I was getting the moles at eqm wrong because of the coefficient. Thank you for the clarification.
And sir about the last part how would I work out Kp just from the mole fraction? Would I substitute the mole fraction of each chemical into the kp expression (instead of the partial pressures) ?
@nishatjeonkim2096 yes, that's correct 👏
You're psychic. How did you know I am on work experience this week and I'm missing the KP lesson, and that yesterday I was searching through UA-cam to find your "KP Explained" video to help me through it.
Amazing, thank you 😁😁😁😁😁
Excellent! It should get you up to speed! 😀
Oh my god this is exactly what i need right now (the exam is getting close). Thank you so much, you've save me.
❤️ brilliant! Really pleased it's helped 😀
Hi sir, can you please make a video for the reactions of transitions metals such a ligand substitution and the colours of the complexes please?
I definitely will. I've got a few other videos on the go though, so unlikely to be before January now
Thnx for the good job sir pliz help me make a vid for mole concept using your equation method
Hi. Do you mean this?
ua-cam.com/video/bAa0fGNZhjM/v-deo.htmlsi=DDkqb-5SfMhxFg5X
Hi Sir, please could you make a video on aldehydes and ketones ?
It's on the list of my next 3 videos: P3 Oxides, Rate Equation and Carbonyls
😃
@@chemistrytutor Thanks Sir ! 🙂
This was helpful.
Thank you for the feedback 😀
is this for Year 1?
It's year 2.
Although, it's got lots in common with the year 1 Equilibrium Constant, Kc topic