Dr de Bruin's Classroom

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@jemimahafilaka2079 4 күн бұрын

Thanks a lot 😌

@OsmanAbouelgheit-i2w 6 күн бұрын

Why is part 1 privated please unprivate it

@DrdeBruinsClassroom 5 күн бұрын

Looks like I redid it. kzbin.info/www/bejne/nGqoh2Cqac9ra9k for some reason. (3 years ago so i can't remember why!) Where did you find the link to the old version so I can change it?

@gcse90 12 күн бұрын

I found your videos for GCSE Combined Science really useful and was wondering if you could do the same summary vids for AQA A level Biology

@DrdeBruinsClassroom 11 күн бұрын

Since I don't teach AQA A level biology, I'm afraid not!

@DONDAESTALEOMESSI 17 күн бұрын

BEST TEACHER EVERRRRRR ❤❤❤❤

@DrdeBruinsClassroom 15 күн бұрын

😍

@Maria-vm7ep 25 күн бұрын

thank you soooo mucchhh i used you for gcses and you saved mee!!!

@DrdeBruinsClassroom 25 күн бұрын

I'm so glad!

@ar2207z Ай бұрын

I used to watch your videos for science Gcse, and here I am watching it for A levels😭. thank you soo muchhhhh!!!

@DrdeBruinsClassroom 28 күн бұрын

Welcome back 😍

@suuuushi 20 күн бұрын

She’s such a lifesaver ❤❤

@Milojs7 Ай бұрын

I thought covalent character meant the bond was stronger? how come Al2O3 melting point is lower than MgO? Thanks :)

@DrdeBruinsClassroom 27 күн бұрын

This has always bugged me too. So, the bit I'm sure of: Yes covalent character means stronger COMPARED TO WHAT IT WOULD BE ACCORDING TO A BORN-HABER CYCLE (see Y13 Thermodynamics) So that just mean that the Born-Haber prediction for Al2O3 would be even lower. And then the bit where I'm guessing: I suspect it's because the 1:1 ratio of MgO means the ions pack together really neatly, whereas the 2:3 in aluminium oxide means the ions are further apart and that reduces the energy needed to separate them. But I have no evidence for that. I'm just extrapolating from what I do know! If you find out, let me know!

@HashimZeb-e9c Ай бұрын

absoloutely goated

@Hanna-th4cl Ай бұрын

could you start doing the recall questions you do for gcse for a level? x

@DrdeBruinsClassroom Ай бұрын

You mean like bit.ly/RecallASChemistry ? 😆

@Footyedits10. Ай бұрын

ty for the help

@naav. Ай бұрын

YES KING !

@zahra.2808 Ай бұрын

Thank you ❤

@GokuLoverForLife123 Ай бұрын

thank you so much theses videos have helped so much I do triple science for gcse and I have really been struggling with these, however you have really helped !!

@DrdeBruinsClassroom Ай бұрын

I'm so glad!

@akashjoykuriuakose1927 Ай бұрын

Thanks for the revision

@Study_account1603 Ай бұрын

Hi. Can you just work out the moles, then work out how much product it makes, using the molar ratio, and which ever is smaller, is the limiting?

@DrdeBruinsClassroom Ай бұрын

Actually, yes. It had never occurred to me to do that, because it would take longer, but if you're finding my way confusing that would also work. Thanks for the suggestion!

@liba-by4xv Ай бұрын

heyy i just wanted to say in ur catalyst vid u forgot to mention homogeneous and hetreogeneous catalyst

@DrdeBruinsClassroom 18 күн бұрын

It's right there? kzbin.info/www/bejne/goOYcmyfmt9ooLcsi=gFo6GRSoBlYybM7U&t=134

@liba-by4xv 14 күн бұрын

@@DrdeBruinsClassroom aah sorry ty

@julkamikula1553 Ай бұрын

girl u okay? whos banging at your door like that XDD

@zorizo2616 Ай бұрын

I just wanted to thank you so much for making these videos my predicted GCSE science grade was a 4-4 and with your help I manged to get a 6-5 without your help I really wouldnt have been able to do it so thank you so much ❤

@DrdeBruinsClassroom Ай бұрын

That is awesome!

@AmaAmowah 2 ай бұрын

Great resource as always! Please check the moles at end for A-. Should be .004-.001= •003

@AmaAmowah 2 ай бұрын

How would you calculate pH for weak BASES, please ?

@DrdeBruinsClassroom 2 ай бұрын

By using Kw, the ionic product of water. Kw = [H+][OH-] so by rearranging you can solve for [H+] and then plug it into the pH equation. (If you're working at 298K you can also cheat and use 14 - pOH, but that only works at one specific temperature!)

@Toyyibah-qt4bn 2 ай бұрын

What makes this equation different from using the mass equation one

@DrdeBruinsClassroom 2 ай бұрын

You get an answer in mol/dm3 instead of g/dm3. That's way more useful for chemistry when you need to know how many molecules are reacting, which you can't do with masses.

@Toyyibah-qt4bn 2 ай бұрын

I’m confused how this video has such little views

@Zeromanshotscrap 2 ай бұрын

THIS WILL SAVE MY MOCKS I CANNOT THANK YOU ENOUGH

@ImranAwan-n9s 2 ай бұрын

For the ligand substitution reactions, what colour changes are we meant to know?

@ImranAwan-n9s 2 ай бұрын

Do we need to memorise any reactions for autocatalysis, and do you have a summary of what we're exactly supposed to know for that sub-topic?

@ImranAwan-n9s 25 күн бұрын

What reactions are we meant to memorise for catalysts?

@ImranAwan-n9s 2 ай бұрын

For the last question, in the 5th step, why are you dividing by 3?

@DrdeBruinsClassroom 2 ай бұрын

Because you've just worked out the number of C2O4 ligands and the compound contains 3 of them.

@ImranAwan-n9s 2 ай бұрын

At 4.50, doesnt the reaction go from pink to colourless, as we are going from MnO4- to MN2+?

@DrdeBruinsClassroom 2 ай бұрын

No because the potassium permanganate is in the burette, not the comical flask. If it gets reduced it goes colourless. If the reaction is over it will stay purple, and change the colour of the conical flask

@Presidentstalk.... 2 ай бұрын

isn't it zero order wrt to B?

@DrdeBruinsClassroom 2 ай бұрын

No, because if it was then B wouldn't affect the rate, and #3 and #4 would have the same rate

@Presidentstalk.... Ай бұрын

@@DrdeBruinsClassroom Thank you

@alexandra-yt2bn 2 ай бұрын

52:02

@LilyPatel-y4w 2 ай бұрын

Extremely Helpful Video. TYSM! :)

@TalkingTomAndFriendsAMVs 2 ай бұрын

This video really helped me and will in my mocks coming up thank u. It takes ages to go through alot of the chemistry topics and going through them quick and easy to understand is great 👍

@DrdeBruinsClassroom 2 ай бұрын

Glad it helped!

@ImranAwan-n9s 2 ай бұрын

Which equations do we need to memorise?

@DrdeBruinsClassroom 2 ай бұрын

All of them

@KingslinaOboh 2 ай бұрын

Thank you so much for this❤ God bless😊

@AmaAmowah 2 ай бұрын

Fantastic help! But do check the rem for KF and effect the corrections.

@DrdeBruinsClassroom 2 ай бұрын

Potassium is 39.1 Fluorine is 19. It's 58.1 That's the number I've used at 8 minutes ish and 10:20 ish. Is there another place in the video featuring KF?

@Nevnevbrev 2 ай бұрын

Lets goo

@sugarteacookie4678 3 ай бұрын

Thank you so much❤

@DrdeBruinsClassroom 3 ай бұрын

You're welcome 😊

@avtandilitsagareishvili1923 3 ай бұрын

hello, may I ask how is copper sulphate is formed because isn't copper less reactive that hydrogen

@DrdeBruinsClassroom 3 ай бұрын

Have I put in a question somewhere where I've said it is? (Entirely likely...) or do you just mean in general? If the latter, then usually by sulfuric acid reacting with other compounds like copper oxide or copper carbonate.

@judyy9390 3 ай бұрын

Will the sheet be linked

@DrdeBruinsClassroom 3 ай бұрын

There's a link in the description to all of the questions and then Group 2 is in the Inorganic folder

@Study_g1rl3e 3 ай бұрын

This video was so helpful🩷you explain it really clearly and the diagrams on the side really help🎀💗

@GCSESahr1508 3 ай бұрын

Monkeys eat peanut butter

@ar-mo7xc 3 ай бұрын

Really appreciate what you do for a-level students. Please keep it up because I really love your videos 😊❤

@heardukey 3 ай бұрын

the goat is back

@AmilRegi 3 ай бұрын

really helpfull

@แมงมูส 3 ай бұрын

can you post the answers for half equations practice?

@DrdeBruinsClassroom 3 ай бұрын

Are the answers not all in it video?

@แมงมูส 3 ай бұрын

@@DrdeBruinsClassroomfor 10:50

@rositamohanty9664 3 ай бұрын

Shouldn't it be conjugate base [A-]/weak acid [HA]?

@DrdeBruinsClassroom 3 ай бұрын

Only if you're adding it. Like I said at the start there are multiple versions. I like to subtract so it's acid over salt.

@Study_account1603 3 ай бұрын

Hi, if I learn EVEYRTHING in the GCSE QUANTITAVE CHEMISTRY playlist (that you made), will I be set for all questions from this topic? This is because I find it very hard to 'work it out', unless I know how to do it. BTW, I am predicted a 9 in GCSE CHEMISTRY (and in all the three sciences and maths), but it gets really confusing if you don't know what to do!

@NJxD519 4 ай бұрын

Thanks

@samuelajigboye7094 4 ай бұрын

U just saved my exam, thank you😊

@samikshasubramaniam5232 4 ай бұрын

Thankkk uuuu u really helped me so muchhh✨

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