AQA A-Level Chemistry - Entropy
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- เผยแพร่เมื่อ 5 เม.ย. 2016
- This videos covers the term entropy and what it means followed by the calculations that are associated with it.
Here's the link to the RSC's Quantum Casino site: www.rsc.org/learn-chemistry/re...
[Timestamps]
0:20 - Definition of entropy
4:58 - How entropy affects feasibility/spontaneity of a reaction + ΔS calculations
12:25 - Gibbs Free Energy Equation (+ how ΔG affects feasibility)
18:29 - Exam Question 1 (Jan 2010)
23:35 - Exam Question 2 (Jun 2013)
do you know if this is from old or new spec?
@@jasmin4518 All of this content is on the current spec (p.26 of specification document), although the exam questions he uses as examples are from the old spec.
Hopefully this video is gonna be quite short
Becomes 30 minutes long
I WAS SAY THE EXACT SAME THING
i realize it's quite off topic but do anybody know a good website to watch newly released movies online ?
@Lane Genesis Flixportal :D
@Harlan Rohan thanks, I went there and it seems to work =) I really appreciate it !!
@Lane Genesis You are welcome =)
PRAISE THE LAWD FOR HE HAS RETURNED
i cant thank you enough for what you are doing, any doubts that i had regarding chemistry got cleared thanks to you, u sir are a legend and i really hope you continue making vidoes
yay I'm gonna fail a little less now lol *starts crying*
No other video or textbook has explained it as well as you. Thank you
Our Lord and saviour has resurrected, rejoice young students for he has returned
+BCT he is my chem teacher at school lol
3432 eriador lucky
@@eriador-qb4rs You must just sit in his class and watch these videos lol
I was struggling with this chapter but now I've gotten to grips with it. Thank you!
Watching this the day of A level chemistry paper 1! Thank you!
What is ammoniya 18:58 :)
Hahahah that's what i was thinking
🤣
Lol I've never heard anyone pronounce ammonia like that! Thanks for the video! :)
+BakingAPie LOL same I thought I was the only one...:')
+BakingAPie How do I say ammonia?!
+E Rintoul lol, at around 18.58. You pronounced it a little differently to usual :)
Same wtf
@@maazahmed2341 damn ur everywhere on his a2 vids.Cramming for chem p4 tomorrow?
Please... Never delete your channel
Amazing video as always! Your channel helps so much!!
Master Rintoul has returned thank the GODS
"hopefully gonna be really short"
Your videos are very helpful and easy to understand! Please could you make a video on transition metals?
Could you please consider doing a video on esters and synthetic routes, I do realise your actively making videos, but if you could eventually that would be great help:DAnd thank you for all the other great videos too, their really really useful for either first time learning in some cases or for great tips and revision points!!
Thank you very much, these videos are great!
i dont know why our teachers make everything complicated! but u made it much easier... thanksssssssssssss
Thank you for your video, by any chance would you make a video on electrochemical cells?
Hello sir, could you do a video on Titrations for the AS level please? And keep up the good work, thank you!!
Hi there E-Rintoul. When will the new spec AQA A2 Content be made/ put into playlists?
Brilliant! Thank you Mr E Rintoul ! :)
Please can you do a video on the periodicity chapter in unit 5? Would be very useful.
please make more!! don't forget about us doomed old spec A2's for the new speccies! we loved you first!!!!!
Did catalysis today!
Your videos are fantastic!
Could you make playlists for the physical, inorganic and organic sections of the second year for the new spec? That would be great!
Thanks! :^)
right on time! thank you!
Please do some more unit 5, really needing the extra revision!
THANK YOU SOOO MUCHH, HAVE A BLESSED DAY :)
Can you please reply with the links of the past papers you got the questions from
23:08 the Haber process takes place at 700K even though it's no longer feasible above 464K, can someone pls explain why it still occurs at the high temperature? thanks
Hi is it possible for you to make walkthrough of the A2 papers before the exams start? Thanks,
hi. just wanted to know how many full past papers you have been through?
thanks
love your videos! they really help me as my teachers are not the best at explaining, would it be possible for you to do one on period 3? would really appreciate it!!!
Fanks Mr Rintoul ur my saviour
Hi Eliot - just out of curiosity, what do you use for writing? Your text is very consistent, it looks like some kind of font software. If it's actually your handwriting you are astonishingly consistent. Nice videos, by the way.
Great video as always, thank you! But what is actually meant by free energy?
is this the whole of the thermodynamics topic along with the born haber video?
Thank you so much for this video sir! ☺
I do not quite understand the last portion the gradient is negative as you say and this mean that value of entropy change is similarly negative,how then ca you say that the entropy change is positive in the next question?
The line shows d.G becoming more negative as d.T increases. This would happen only if d.S is positive because in the equation, it is d.H-T*d.S. If d.S were negative, - and - make + so you would have to add d.H and d.S which means as T increases, d.G increases. This doesn’t go with the graph as the graph shows as T increases, d.G decreases. Therefore d.S has to be positive.
Please explain 3bii) again as I am confused as to why its positive?
you are an absolute lifesaver
No one:
Absolutely no body:
Eliot Rintoul: A-mun-aya
Do you have any videos on periodicity?
Thank you so much! However, transition metals is the part that i think most people find challenging as theres just so many reactions and observations to remember etc. Will you be making a video on it?
+Ayy Yup. Watch this space.
+E Rintoul i agree, especially with ligands and redox titrations its a mess across lots of books
Lachlan Taylor Yeah, it's all quite spread across. Luckily I think I have condensed it all quite nicely and shall do so again in the upcoming videos!
E Rintoul ok great! Thank you!
+E Rintoul Thank God for this
thanks sir, much appreciated
Could you do more exam questions on this?
Thank you so much
This video was very helpful
A very nice video! When do you think is the best time to start past papers for Chem4 and Chem5?
+Qwerty Tamil I would suggest only starting papers once you are completely happy that you know all of the content. But you should have been revising for a few weeks by now!
i don't get why in the second graph question 3b2 you took the entropy positive despite the graph showing it as negative cause the gradients negative 28:00
Great video, thank you!
starts with "hopefully this video is gonna be quite short "................. *makes a 30 min video * XD
Seems like you had a lot of fun making this video 😂
hello sir! hope you are doing well...
It would be really kind of you if you could let me know about the minus.... in the equation when delta g becomes zero and we rearrange it where does the minus go?
Delta G= delta H - T delta S
T= delta H over delta S
Missing minus....do we ignore it?
I am really looking forward for your reply....
Its okay... if anybody else reading could help me....
=)
Video on period3 and redox equilibria plz
You literally got me my As grade thank u, question; do you know what you have to get to achieve an A* this year?
Lana Rose I'm writing my A Level this march and was wondering the same! Did you end up getting an A* ?
Bharath Nagarajan i believe she has an A level results video . Although i think my message might be a bit late
how did it go
The way you pronounced Ammonia 😫 never heard it like that before. What part of the UK are you from??
TheJileyProduction really?! I grew up in Norfolk but live in Yorkshire now.
+E Rintoul I'm from West Yorkshire! I've always heard it pronounced like ammo-knee-ah instead of ammo-nigh-a
Just wondered in 5(e)(ii) how come the delta gibbs wasn't in the rearranged equation in terms of T, is it because it has a value of 0 in this case?
Yes, that's the reason
@@LeraGasparian Thought so, thanks
Thankyou so much for this
Real cool video.
can you do aromatic chemistry pls!!
Hi E Rintoul. We absolutely love your videos. Would you be interested in producing a video series with us for revision time?
You better do this, Rintoul.
i don't understand 3bii, shouldn't delta S be negative?
Mikaela Prim exactly, its a negative gradient...?
THE REAL MVP!
if you need to save time change the settings by watching at 1.5/2x speed, just as much info in half the time x
Any more Chem 4 or Chem 5 vids comings?
Just did one on catalysis today.
Great thanks! Are anymore videos coming before the A2 exams?
thank you sir!
is there any chance of you completing this section off? You'd be a life save if you could do the auto catalysis/catalyst section and finish off the Transition metals. Love your videos, they are a great help.
It all depends on how much time I have - I'd like to say yes, but I don't want to get hopes up!
Well the Chem 5 exam will be on the 22nd of June so if you are able to finish this before then it would be Great!
Any new A2 vids coming out? This video helped me understand better than in classes, thank you!!!
I watch these videos and get what you're talking about mainly, but I'm not sure if I should do Chemistry A Level because of the jump from GCSE to A Level. Could you advise me?
+Harpistry i found that the beginning of AS was very difficult and i didn't have a clue what was join on, and i hated it and wanted to drop it at the end of yr 12, now I'm doing A2 and everything makes sense! I'm resetting as well because i only got a B last year and honestly it seems so much easier now and i have no clue why i didn't understand it, even this year i understand things so much better, so yeh i would go for it!!
+Liz Paul I mean I got a B in Chemistry and an A* in Biology and really struggled with Chemistry then, but looking at AS I understand it! I just get the feeling I have to know everything or I'll fail, is that how it is?
I got a C for AS Chemistry because I failed one paper completely even though I did really well on the others, so I am resitting those. A-Level Chemistry is a huge step-up from GCSE Chemistry so if you find GCSE Chemistry hard then its not going to get any easier. But if you are dedicated and good at learning and remembering stuff then sure, A-Level Chemistry might be something for you.
Derpy Thanks for your perspective. The hard part for me isn't remembering - my memory has saved me in many an exam - but the mathematical parts are what I don't find so easy. Still, I do like the idea of going into Medicine, which basically requires it!
What's the hardest part, remembering, understanding or mathematical parts?
+Harpistry All I would say is that a GCSE grade isn't a very good indicator to A-Level grades! As far as whether you should take Chemistry goes, I have a vested interest, but I would say yes! It's a great subject and looks fantastic on a uni application and CV! It's hard, but provided you are aware that it won't be a walk in the park and you work hard from day one, you'll be fine.
Thank you!!
Thank you 🖤🖤🖤
is there a video on hess' cycle anywhere?
+Lachlan Taylor Yep, here: th-cam.com/video/pQAND6QlLNQ/w-d-xo.html
E Rintoul thank you!
+E Rintoul is there one for cycles with enthalpy of atomisation, ionisation, lattice formation/dissociation etc?
I think i'm caught up with formation and combustion on their own
Lachlan Taylor There is but it needs tweaking! Here it is: th-cam.com/video/IM2JubP3agE/w-d-xo.html
E Rintoul thanks
I'll fail less miserably now yeyyy, elated!
Isn't this part of the new AS specification?
+John Doe It certainly isn't!
+E Rintoul Oh sorry my mistake. By the way, will you be finishing the videos for the new AS specification before the exams this year?
John Doe I shall aim to. It all depends how much time I get to put into them!
+E Rintoul When do you think you will finish the videos for the new AS level?
I'm 100% sure the CaCO3 example should've been 92.9 - (39.7 + 213.6) = -160.4 Jk-1mol-1 as CaCO3 is a product and CaO + CO2 are reactants...
no the CaO + CO2 are the products because they are PRODUCED as a result of the reaction (thermal decomposition reaction). the LHS is always the reactants and the RHS is always products
I got -44.5 for 3)c)i) (28:28)
17:47
hopefully this video is going to be quite short.... 30 minutes long. LOL !
Mr erintoul how are you so nice, how are you so much full of spice, you are the light. Of the bright. Goodnight.
lol
ammo what xD
It’s from cell to singarlarity blablablabla
Chicken
+Ross Mannion What about it?
+E Rintoul its just a nice food to eat while doing chemistry
Ross Mannion Protein is probably good for the brain.
23:36
18:58