AQA A-Level Chemistry - Energetics Pt. 1 (Enthalpy & Bond Energies)

[@kpopff]

9 years down the road and you’re still saving students from failing chemistry you are a genuinee legend

[@emmaw414]

i swear i don't know how i would cope without these videos, thank you so much for getting me through AS chemistry :)

[@katiebloomer2789]

Û

[@lisaschneider9151]

Same!

[@diafrr]

What u doing now?

[@ayeshakhan8726]

Emma, what are you doing now?

[@learnquran8894]

Emma, what are you doing now?

[@pulseofmaggots3209]

I'm in self isolation at the moment and honestly i'm so glad these videos exist because i don't know how to teach myself the AS spec without you

[@owaisn6095]

dont know what to say but 10000000000000% agree with you #ALEVELS2021 Good luck lol

[@nikolaplocha2796]

Same!! These videos are gonna save me life, having to teach ourselves the rest of the content for a levels is gonna suck but these videos will pull us through!! #ALEVELS2021

[@aadamaflaq1556]

shush

[@samanhussain702]

same hello from 2021

[@notahmed8397]

@@samanhussain702 SAME

[@borojenxx4193]

So happy I found this channel! College hasn't been great for me, a death of a friend has left me suffering mentally. But I carried on with the second year which I was regretting as I've missed lots of days and lots of work. And even when I'm there, I just can't seem to learn. Books have helped, but this topic was a real struggle to read on. So I'm glad I took a chance to try finding lessons on youtube and this channel pops up! Thank you!! x

[@MrERintoul]

That's terrible; I'm sorry for your loss. I'm happy to have helped though - do let me know if there's anything you need help with.

[@pisstake7793]

sucks

[@sanyaali2003]

i imagine its a piss take

[@puddleduck1405]

damnn it's been 7 years now, but I hope you're doing better :) God bless you and take care!

[@SG-ee4gc]

@@sanyaali2003 word

[@jacobpatey1963]

This video is 7 years old and it’s still so helpful, I have an exam today and this is so helpful

[@Thebodycamproject]

I have an exam tomorrow and this has proven to be a life saver thanks alot!

[@MrERintoul]

+Muhammad haroon I'm glad!

[@zoejenkins2515]

Thanks for your videos, I don't struggle with chemistry and it's by far my favourite subject, but this just helps me revise the topics before each class!

[@MrERintoul]

+Zoe Jenkins I'm glad :)

[@bensykes274]

Note for enthalpy diagrams, the Activation energy should be a single arrow not double ended like enthalpy change, I've lost marks for this

[@florencefraser3373]

What direction?

[@laraybs8790]

@@florencefraser3373 I think in the upwards direction

[@Modelstl063]

Cram squad reporting in!

[@sanjayraju988]

(Change in H) = (Bonds broken) - (Bonds made)

[@laurieallan5060]

Thank you so much for making these videos, they're brilliant and you've saved me from failing chemistry

[@tysonnyasha8097]

Thanks Elliot. Wakaipa iwe usanyeperwe

[@aqsakhan6946]

8 years later and this video is still helpful to this day , thank you very much

[@ishanahar7984]

what didnyou get in youe alevels😊

[@aqsakhan6946]

@@ishanahar7984 i havent done them yet , doing them currently

[@tsitsimarcy6347]

THANK YOU SIR YOU HAVE MADE MY ROAD EASIER TO CHEMISTRY.

[@laleenshehzadikhan6594]

can u plz do a video on enthalpy change of formation/combustion/atomisation plzzzzzzzzzzzzz

[@k4sherine]

thank you for saving my life (quite literally) xxxx

[@MrERintoul]

+Katherine Mielniczuk I'm not sure that's quite true haha - but thank you for the kind words!

[@mxhsvn_b7866]

@@MrERintoul it still is sir thank you so much

[@drspinz955]

you're literally my SAVIOUR

[@zeyxab]

are you still active?

[@nunohenriquenasicemento8445]

@@zeyxab asking the real question

[@nunohenriquenasicemento8445]

@@zeyxab after Tom is my u2

[@zorack4961]

Clear , simple and well explained!

[@thetechnologymasters8378]

Just great, loved it keep up the work

[@jeeva1996]

surely @ 16:15 the H-H and O=O is Exothermic because when you break a bond don't you release the heat stored within and when you make a bond (H-O-H) don't you take in energy to form the new bonds. could you please explain I'm a little confused at this bit? thank you

[@MrERintoul]

+jeeva1996 If we are making that bond then yes. But, breaking that bond requires energy. Has that explained what I mean?

[@jeeva1996]

E Rintoul yh kind of thanks

[@MrERintoul]

jeeva1996 You sure...?

[@asraareena2945]

Thank u for the video... it was so helpful and really simply understable..!!

[@kellybrownnelson2947]

Literally saving me right now. I wish I saw your videos earlier

[@maddisonwilson308]

Getting me through remote learning:)

[@nuras4000]

Really enjoy your videos! However I'm slightly confused, at GCSE we were taught to do "reactants minus products" however now at AS my teacher (who is hopeless) is telling me that it's "products minus reactants" so I'm pretty confused. Also I was never told to add the reactants and products, so I'm pretty stumped. I used to be really good at these questions at GCSE but at AS everyone's confused me -_-

[@MarioLopez-xq8zh]

From what I understand it should be Products minus reactants and the answer is given in kj/mol H(products)-H(reactants)=Enthalpy change (kj/mol)

[@fizzasyed70]

Reactant- product is for all enthalpy change reactions except enthalpy change of formation, for enthalpy change of formation its product-reactant.

[@myrosesarewithering1015]

the fact ur probably like 24 rn or something 😭😭

[@nuras4000]

@@myrosesarewithering1015 yeppp turning 25 in 2 weeks 😂

[@myrosesarewithering1015]

@@nuras4000 aw thats brilliant lmao its so strange going onto comments like this tht r like 6 or 7 yrs old ?!?! i hope ur a levels went well xx

[@laudinasafo2340]

Hi Eliot, Thank you for the good work. I use your videos a lot with my students. I was wondering what software you use for your videos because I am looking into an interactive teaching like yours now that I have to teach from home. Any suggestions or recommendations will be greatly appreciated. Thank you

[@daaragoodluck]

Ipad and apple pencil work pretty good

[@emilyhughes2718]

How would you arrange one of these diagrams in order to find out an individual bond disassociation in a reaction? for example they give you all of the Delta H apart from the H-O bond. Your videos are honestly saving my A-level grade! i really struggle with rearranging things as my maths isn't the greatest, however I'm currently smashing the content and recall questions! THANK YOU :D

[@universalcacti3621]

The only thing that confuses me is the bond enthalpy calculations. How do you know if the answer is positive or negative? I get that breaking bonds required energy so will be delta negative but I'm confused about the overall answer if there are more than one product. :/

[@mzz7800]

Look bonding forming is exothermic that is when delta H is negative Bond breaking is endothermic when delta H is positive Yea so like there are few enthalpy changes which are fixed for e.g enthalpy change of neutralization and combustion are always exp Then enthalpy change of atomisation is endo

[@adammaster722]

Thanks for taking the time to make these videos. I just wanted to ask where enthalpy of combustion and enthalpy of formation comes into, in all of this?

[@MrERintoul]

Adam Master No problem! They don't come into this video, you need this one: kzbin.info/www/bejne/poKkf3dshtF_hLM

[@Indigoblue786]

is calculating average bond dissociation the same as calculating mean bond enthalpy? its confusing me

[@MrERintoul]

Maish Yeah. At AS, you tend to use given bond dissociation enthalpies to calculate enthalpy changes for reactions.

[@rakib567]

YOU ARE A BOSS!

[@MrERintoul]

Rakib sdq THANKS - SO ARE YOU!

[@tomallison1028]

These videos are fantastic! Are all of your videos for the new specification?

[@ssongra95]

E RINTOUL the thing about you is that you're quite different from other utubers .some Of them Just reply for the early comments and don't care about comments that are happening if u scroll down. but u reply to everyone and do like a kind of one-one which is nice and this reason u might get so many subs partly also bec u have nice explainable and understandable vids keep up and keep progressing.

[@124r7]

Siddarth Songra lmao he didn't reply to you thou

[@sethcrockett9061]

Siddarth Songra haha he didn’t reply to you lolololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololol

[@mohameddalghous]

@@sethcrockett9061 lol

[@navjotsingh2251]

@@mohameddalghous lol

[@mohameddalghous]

@@navjotsingh2251 haha u catching me years later

[@nosir1479]

So are the bonds in the reactants always broken or are there some cases where the reactants are formed (and the bonds in the products are broken)?

[@humanaccount2754]

idk maybe, but definitely not something you need to know in AQA A-Level Chem, and doesn’t impact any question whatsoever

[@ayeshakhan8726]

Eliot Rintoul, can you recommend me any channel for A level physics, like yours

[@Celinetlfls]

Sir this is a stupid question but i get confused on which side is breaking or making bonds... Would you help me please?

[@MrERintoul]

Celinetlfls Not a problem! I think it's always easiest to remember that when the reaction takes place, the reacting molecules are broken into the individual atoms and then reassembled into the product molecules. In this case, all of the reactant molecule bonds need to be broken (imagine taking a Lego car and a Lego house and breaking them into the individual Lego blocks). Once we have our individual atoms (or Lego blocks if you like the visual element!), we put them back together to make the product molecules (maybe we could make a Lego cat and a Lego pond complete with Japanese koi carp). BREAK the reactant molecule bonds. MAKE the product molecule bonds. Get it?

[@Celinetlfls]

Oh that's an even better way to remember it! Thanks very much :)

[@Krantee555]

i can be your your slave if u want ,, youre a life savior,, i actually cannot believe i get all of these contents clearly

[@sanusidangote7865]

when do i use o-o(not double bond) am so confused

[@Cardifyz]

Please do a video on Infrared spec.

[@noproblem3985]

he has its in the organic part the analytical one

[@emeldocherty685]

I thought enthalpy change was measured in kj/mol-1 ? not kj/mol? thanks

[@34naveed]

They are the same thing

[@34naveed]

Kj mol-1 is the same as kj/mol-1 and there is no such thing as kj/mol-1

[@MrERintoul]

+Emel Docherty It can be kJ/mol OR it can be kJ mol-1. Mathematically, both are the same!

[@jackieyu74]

Im doing OCR Chemistry at A Level, do you think I can use these videos to revise? Most of the course contains this but I'm not sure if there would be slight differences in the mark schemes etc.

[@AnjaliSharma06]

Is this applicable for the people sitting their exams in 2018

[@MrERintoul]

Anjali Sharma absolutely!

[@doctortrigger]

what if the equation is 0.5N2 + 1.5H2 ---- NH3 would you half the value of nitrogen bond energy?

[@syoxic492]

doctortrigger I believe that the rule to follow is to multiply the bond enthalpy by the amount of moles for the element so if you have a value for the nitrogen bond energy then i would just multiply it by the 0.5 but you'd have to check.

[@MrERintoul]

doctortrigger In this situation, you would half the value, yeah! The reason is that the value given is for one mole of that bond so multiplying it by the big number takes care of that!

[@MrERintoul]

Connor Simpson Spot on, Connor!

[@michaelaparis4114]

At 10:34 you wrote O=O, what's the difference between the double bond or the single line like this > O-O ?

[@toasticide816]

+Michaela Paris O=O is only presesnt in the molecule O2 whereas O-O is in any molecule with two or more oxygen atoms connected to themelves and other groups. it's very hard to explain as at AS i don't think you even come across such a molecule. the easiest way to explain it is imagine ethanol but instead of an -OH group it's an -OOH group. (remember each O must bond to two other things, but can be ANYTHING from another oxygen to hydrogen or a halogen)

[@michaelaparis4114]

+Louis Moore Thank you!!

[@foziahsyed3720]

Why did you add the reactant and products in the end question?

[@MrERintoul]

+Foziah Syed That's the way that I do it - I make the products negative and then add them. You could do reactants - products. Both work.

[@zohrant7399]

How do you idenitfy a double bond from a compound chemical written state.

[@Rei-zo6sg]

U dont

[@manhaabdellah2682]

thankyou so much for making brief videos I have got AS coming and this is a lot of help!

[@fasihkhalid6881]

I love ur videos man seriously uve taught me alot of chemistry

[@umrahbajwa]

Watching this in 2024 and it’s THE best video

[@mazinnasralla2036]

Why are you rounding pressure to 100kPa? Standard pressure is 1 atm or 101.3 kPa. We don't say 300 Kelvin for Temperature so why round the pressure? Thanks though.

[@mazinnasralla2036]

Mazin Nasralla Found out I was wrong. The pressure is 100kPa. Surprising as that's not atmospheric pressure

[@MrERintoul]

Mazin Nasralla I'm not rounding anything! I'm using my knowledge of the past papers to give a situation that is very likely to come up i.e. 100kPa. You could be given the values of pressure as 101kPa, but if that's the case, you use 101kPa, not 100kPa!

[@mazinnasralla2036]

Thanks. I realised I was wrong some while ago and posted above.

[@tobexdmasterofjej6363]

So delta H f is always negative and delta H c is positive?

[@irfanchowdhury1891]

Your videos are really helpful! Its really helping me in As. can u also suggest a channel which will help the same way for As physics! That would also be really helpful

[@master_salem9579]

Irfan Chowdhury Dr physics is a really good one check it out

[@irfanchowdhury1891]

Thanks a lot!

[@sooyan5476]

What about defining standard enthalpy of combustion and formation? :/

[@mulazzor5977]

is this good for cie international?

[@acemaths7793]

Is this video about Chemistry?

[@mavihs26]

+AceMaths I'm sure you trolling but Yes xD

[@MrERintoul]

+AceMaths Nope. Are you Maths?

[@ScribbleDribble]

+AceMaths Nope, obviously further maths.

[@Jex2Monsta]

So if breaking bonds require energy in chem. reactions. Does this mean all chem reaction start out endothermic??

[@MrERintoul]

Alexander LQ08 nooooope. You're assuming that all chemical reactions only involve breaking bonds and that the process stops there. You have to account for the bond making process. However, if you're asking whether every reaction literally starts with an energy requirement, then yes, I believe that is true.

[@Jex2Monsta]

E Rintoul if so does this mean there can be a curve where energy goes straight down froom a reactant to product. Because in both exo and endo curve Energy initially increase. thnx

[@MrERintoul]

No because the little blip upwards represents the activation energy and that is always present. It just so happens that room temperature is sometimes enough energy to meet the requirements.

[@rubinakausar7713]

U r amazing . Thank u soo so much for such videos.

[@mikailgafow2784]

You sir are a life saver.

[@tompapworth143]

is this for gcse revision?

[@ak-ee1qv]

Tom Papworth no, AS revision

[@MrERintoul]

Tom Papworth Hi, Tom. There are elements (no pun intended - chemistry joke) that are suitable for some GCSE specifications, but it's aimed at the AQA AS course.

[@mohammedashfaqpatel936]

Sir, will we be given the average bond dissociation energies in the exam? If not, do I need to remember these? i don't get it. Thank you

[@ellieg3210]

Mohammed Ashfaq Patel im pretty sure theyll be in the question. At least i hope so. Its in 2 days.....

[@catcatcat2899]

Thanks, you explained it beautifully!

[@fishwoman7825]

What software

love the accent man!

[@abdullahdeen9849]

I am studying from the Cambridge board So does this cover that? As in is it the same syllabus content?

[@minas9393]

Did you find any good resources for Cambrige??

[@meg__moo4374]

Saved my life - so great

[@Sabakhan-zn3jc]

Best explanation

[@galaxyneo1287]

God bless you man

[@hassanmohamed3272]

Sir what grade is this

[@MrERintoul]

Hassan Mohamed It's not as easy as saying that some topics will give you an A or B etc. Rather the questions on each topic are differentiated to cater for a range of abilities.

[@sprognosisj8924]

+Hassan Mohamed It is for people age 16-18

[@technotion782]

Sprognosis J yes. This is A level (College/sixth form)

[@nadx97]

is there much of a difference between AQA and CIE AS chemistry ?

[@MrERintoul]

Without looking in-depth, I honestly have no idea! If you provide me with links to the specifications, I will have a quick look and see...

[@nadx97]

www.cie.org.uk/programmes-and-qualifications/cambridge-international-as-and-a-level-chemistry-9701/

[@nadx97]

Im a chem student from Pakistan and I've been using your videos for revision. i was just curious about any differences

[@MrERintoul]

nadx97 It certainly looks similar... Get the AQA and CIE specifications side-by-side and have a look through. From a quick glance, as I've said, they do look similar!

[@drspinz955]

nadx97 wait... they're diffrent???!!

[@mintiearlert7024]

This has helped so much and is starting to make sense thank you!!!!

[@nadimahmed8485]

Can you make biology videos

[@MrERintoul]

***** I haven't taught Biology for a couple of years so I'm not up to speed with the syllabus. Plus I'm making the videos primarily for the kids I teach so I need to concentrate on the Chemistry!

[@hightreason]

E Rintoul maybe a collaboration with Mr Forster?

[@footballstar2582]

Nice

[@ZyNeEnZyNe]

Got my EMPA tomorrow :l. Great video

[@MrERintoul]

Good luck and remember to take your time! The biggest mistake people make is not reading the question and then writing an answer that doesn't actually relate to the question! Read through what you have written a couple of times and really check that it makes sense and is directly linked to the question in front of you and not the question you think you have read!!!

[@ZyNeEnZyNe]

E Rintoul Thanks for the heads up! I'll keep that in mind tomorrow morning, Thanks for all the help i'll let you know how it went tomorrow.:)

[@solaly9874]

How was the empa i have mine coming up and am super worried

[@ZyNeEnZyNe]

Mine wasn't too bad, it had mole calculations where I had to work out the unknown subscript 'n' of succinic acid, and it has a bit of energetics where I had to work out enthalpy using q=mct and thermochemical cycles. One thing that caught me off guard was percentage errors, I would go over how to do them if I was you, they came up a few times. Good luck, it's not as bad as you think

[@solaly9874]

***** oh right was there a lot of definitions and things involved? And by 'n' you mean moles right? Or am i being really dumb?

[@maisamaskari8774]

i keep hearing the term AQA in your videos , what is that? ...... Im doing Alevel gcse never heard Aqa from anyone other than you

[@tadah5319]

Maisam Askari Is a company that is specialized in education. They make exams and they correct them. In England there are different exam boards, while in other country there are one that is used by the entire country

[@naimalus3827]

Maisam Askari it's one of the major examination boards in the UK (Others are, OCR, Edexcel etc). Each examination board has it's own syllabus they want students to concentrate on. Each college or sixth have an examination board they want their students to sit. So in this case, he's referring to the AQA syllabus for students particularly sitting the AQA exam.

[@imansaifhehe]

whats aqa ??

[@technotion782]

Eman A.R.M.Y it’s an exam board. Eg like Edexcel

[@ellen5388]

So i had this pretty amazing chemistry teacher during my GCSE's that made me love chemistry. However, she had to leave the school so she was substituted by a new teacher who makes the subject so much more complicated, and that kinda made me hate chemistry. BUT LET ME TELL YOU SOMETHING, YOU, SIR, ARE FUCKING AMAZING (Excuse my language but i needed to emphasize on how amazing you are). You're making me love the subject all over again. :") i have a question though. if the activation energy for the decomposition of ammonia is +335kJmol^-1, and the enthalpy of reaction is +92kJmol^-1, how am i supposed to calculate the activation energy for the formation of ammonia (the reverse reaction) using these two values?

[@MrERintoul]

+ellen george Your question is confusing... do you mean activation energy?

[@tobexdmasterofjej6363]

thanks so much for making these!!!

[@kas6148]

4:25 *Endo

[@urabumtin]

Moles

[@MrERintoul]

Enyine-Kojo asiedu-odei Excellent summary.

[@abdulqaadirmohamed3262]

12:36 ; what i say to every girl when i whip it out

[@kev3582]

i am currently doing AS level, so thanks for the notes

[@joshteale8057]

you are a god

[@MrERintoul]

Josh Teale Yes I am.

[@pratikp2462]

+E Rintoul LoL

[@humanaccount2754]

thank you

[@minatozakiz]

do u know how much i love you eliot.

[@danielleb8948]

thank you so much!!

[@AnthrealFernandes]

I fucking love you to bits

[@prushahassan737]

would the three videos on energetics be all I need for the 2016 spec ?

[@MrERintoul]

+Prusha Hassan Yup.

[@leenkhasawneh9189]

THANK YOU!

[@nehasorathiya5719]

heat it heat it heat it heat it heat it, i thought my laptop had a spasm

[@benjaminward7079]

I love you Eliot

[@muhammadbais5508]

thank youuuuu

[@magicxcs2102]

Ty I write next week xD

[@bienabug2869]

🙏🏽

[@kpoppin6167]

Why do u sound like jake from enhyphen? 😳 anyways thanks for the knowledge

[@retooluvyuhx5569]

THANKYOUUUUUUU

[@vishwanathamallampooty7979]

Got Chem day after tomorrow

[@hamzadanial5892]

A little tip. If u change ur cursor to like a pencil cursor. My god ull be perfect.

[@y-_s-ns6by]

ily

[@ScribbleDribble]

Th4nks 2 u, 1 will surv5 2m0r0s t3st :S

[@cantthinkofausername6945]

heatheatheatheatheat

[@LutfunNaher-t2b]

In 2024