Mass Spectrometry | A-level Chemistry | OCR, AQA, Edexcel

[@apolloscharm7804]

It feels like Hermoine Granger is teaching it

[@hu2aifa]

That’s exactly what I was thinking 😂

[@kawsarrayhan6415]

True bro

[@SevenStepsAhead]

not a bit bro she's going way too fast i keep zoning out every 5 seconds@@mugi3090

[@Christina-yr1ru]

😂😂😂 I said the exact same thing

[@arashiii-21m]

Our caribbean exams are really similar to yours and honestly you are a godsend

[@arinarahman3758]

what do u mean by Carribbean exams?

[@shajalal1596]

Love your explanation. Seriously no doubt now in this topic.

[@bishrbourghli5081]

you whizzed through how it works and then spent 5 minutes explaining relative abundance and that there is 25% and 75%, thats not the bit i was struggling with xD

[@ramenyoun501]

Good luck for the Autumn session lads!

[@baz9910]

aight

[@taffsworld5531]

Todayyyyy!!!!!! Good luck

[@ellieellieellie-2]

So is deflection the same as ion drift for question 2? It seemed in your explanation that acceleration caused the ions to separate, is that incorrect?

[@leahjames1357]

yep deflection is the same as ion drift

[@carldzidula8667]

Se didn't say acceleration causes ions to separate She said it the electric plates causes the acceleration of the ions because it is positively charged and the plate is negatively charged causing attraction because opposite poles attract

[@MissCristina]

From AQA Student guide : Time of flight mass spectrometry "the three isotopes of magnesium (24Mg+, 25Mg+, 26Mg+) will travel at different speeds through the flight tube and separate, with the lightest ion (24Mg+) reaching the detector first." so in ion drift phase they are separated.

[@bentownsend4017]

I think two types of mass spectrometry are confused there. One involves different angles of deflection and one involves different speeds of ion drift

[@DAONEWITHDAFRESHCUT]

I really felt it when she went "hhhhaaaaaaannnnhaaaa"

[@horlarlexy4711]

Sorry Lads But it gets wayyy more difficult and confusing

[@themilkemissary7898]

Help meeeeeeeeeee! I cant find a good vid to help me with it

[@horlarlexy4711]

@@themilkemissary7898 kzbin.info/www/bejne/rKO6c42EpMt_nLc. Hope that helps, cuz it helped me (A-level chemistry tho)

[@jessahayes2266]

Prince Lalex I already regret taking a level chemistry. We’re 4 lessons in and already we’ve covered quantum numbers, loads of difficult graphs and sub shells. My brain feels like it’s about to explode it’s so complicated.

[@horlarlexy4711]

@@jessahayes2266 Well, if I'm being honest it's same for me. But I just go through it myself again & again. And I use online vids & textbook's. And I do this again, 80% of time I don't understand Biology in class, but once I get home it's a different story

[@ramenyoun501]

You mean A2 right?

[@MireraNYAMWEYA]

As an American the zed always gets me

[@jetlinjacob6137]

so so so helpful!

[@subhanm1312]

How do you calculate time of flight? When you are given kinetic energy and velocity????

[@readabookdummy]

If you have velocity just do velocity=distance/time and rearrange for time. You will need distance tho

[@eloisestratton-evans1736]

They ask for this in the AQA chemistry Exam Board - you can find detailed up to date notes on the AQA website when searching 'time of flight mass spectrometry'.

[@salmannadeem2827]

wht about edexcel? @@eloisestratton-evans1736

[@sheasexton3636]

it's leviosah, not leviosarr

[@lookunderyourtable8503]

Omds😂😂😂

[@hikmatmakinde7934]

This was very helpful thanks

[@tomlefish7880]

where do you mention deflection? did you mean detection coz I'm confused

[@madlaz5795]

Why is she going so fast? We come here because we don’t get it...yet she’s whizzing through it

[@Wasteman365]

I have it on double speed.. slow it down if it’s too fast

[@baz9910]

@@Wasteman365 hahahh

[@frankyao5854]

I think it's purpose is more to serve as a quick recap, I'm using this for revision rn for instance. There are more detailed videos out there if you are trying to learn this fresh.

[@SevenStepsAhead]

she even gets most of the questions wrong

[@izziecarter2153]

On which video do we swap from AS to A level ?

[@TaylorS0410]

you mean year 1 and year 2?

[@Charl_Ed]

@@TaylorS0410 In Wales it’s As and A-level (same thing tho) 😊

[@TaylorS0410]

@@Charl_Ed ah I didn’t know. In the UK, they used to do that but know it’s just year 1 and year 2 content as we have just one exam (A level) at the end of the 2 years

[@winniethepooh8766]

@@TaylorS0410 wales is in the UK. im assuming you mean England

[@TaylorS0410]

@@winniethepooh8766 sorry yeah 😅 I meant England

[@libbyharris1749]

In electrospray ionisation, are the particles ionised by gaining a proton from the solvent or by the large positive charge of the needle? I've read both and I'm not how to reconcile the two. I'm doing AQA A Level Chem btw :)

[@lucasstokoe9919]

Libby Harris it’s from the spray of electrons knocking electrons off the molecule

[@libbyharris1749]

@@lucasstokoe9919 isn't that the other method of ionisation? As far as I can tell, at this level of study you can do it with a beam of electrons from an electron gun (as you're describing) or with the hollow needle connected to a positive terminal and a volatile solvent. In the AQA student guide it says the particles gain a proton from the solvent, but in this video it says they lose electrons as they leave the needle due to the positive charge. I feel like it's not that simple and it's a combination of the two :)

[@Lichalfred]

It gets a proton from a solution, when micro/nanodrops of solvent evaporate in flight, leaving an analyte molecule with a proton from solution. The high voltage of the tip assists this process by adding extra charge to droplets. One does not come without the other. The proton affinity of the molecule is therefore the critical factor here, as it determines whether the molecule will be ionized by protonation (positive charge), de-protonation (negative) or just preserve its charge that the molecule has in a solution, etc.

[@milliehenshaw9113]

They gain the proton from the polar solvent

[@EsotericMedic]

It is really confusing! Initially I learnt Electron impact ionisation (where the electron gun knocks off an electron) and only now have I learnt this new stuff with the vacuum, needle etc....Not sure how to come to terms with both techniques.

[@randomfactsGG]

Very well explained

[@CHANELLEPLAYS]

I seriously don't understand anything here

[@godgod6335]

Set 8

[@ShaRad2314]

@@godgod6335 really not. this is one of the most difficult topics. Why do you feel the need to downgrade people

[@godgod6335]

@@ShaRad2314 it really isn't one of the most difficult... IT'S ONE OF THE EASIEST

[@ShaRad2314]

@@godgod6335 it maybe so to you... please don't assume everyone finds it as easy as you. I find all the other topics easy but I really struggled on mass spectrometry. So not everybody thinks like you

[@MM-zm3sq]

@@godgod6335 if it was easy why are you watching this video

[@SevenStepsAhead]

a walk in jurassic park

[@aidaeshraghi9741]

Hello I love these helpful videos but like the pace at which the explanations are being said are too fast for hearing and understanding at the same time. I would be grateful if you could lower the pace of speech in the future videos. Thank you

[@shazgod6037]

u can play the vid slower

[@henstar337]

set the video speed using the slider in the video options

[@dark_is_my_tea3946]

I agree. She needs to slow down a bit

[@kma2243]

To find the relative atomic mass, why do we need to divide it by 100??

[@amanullah4718]

What software you used to make this slide presentation?

[@peterdrake5156]

Mass spectrometers produce a mass spectrum not a mass spectra. Spectra is plural.

[@abbasrizvi2488]

Spectrometers is also plural

[@khalidomar4764]

lifesaving!!!!

[@arifmammadov5421]

Why are the relative atomic masses of many isotopes decimals and not whole numbers?

[@hog7069]

Relative atomic mass is actually the weighted average mass of all isotopes and their relative abundance in a specific sample of an element. For example, the relative atomic mass of Cl is 35.5 because its found using the formula, isotopic mass × relative abundance + isotopic mass + relative abundance ÷ 100 (100 because the total percentage of relative abundances of each isotope is added up to be 100) so basically 35 × 75 (cl 35 abundance is 75%) + 37 ×25 (cl 37 abundance is 25) ÷ 100 = 35.5 . Hope this helps

[@mlyka17]

The lip smacking noises are low-key annoying 😂😂😂

[@maxharris5249]

Why did u point it out 😭 now I’m noticing it

[@johnsisac1907]

What am i doin here with cbse

[@SevenStepsAhead]

she speaks so fast lmao i keep zoning out every 5 seconds

[@HannahAbraham28]

LOL I HEAR HERMIONE OMG

[@robbiemcdonald4144]

Is it possible to download the notes you're teaching from if we pay for the course?

[@launchpadlearn]

Yes! You can get a copy of cheatsheets, handbook, notes and access other resources like videos, quizzes and a lot more if you subscribe to our packages. Just head on to snaprevise.co.uk for more info! 😊

[@priyankapanchal6665]

Chloroquine na IR,Nmr Ane mass spectra kae rite sodhvana

[@nastaranghahremani2900]

Does anyone know the difference between mass spectrophotometry and mass spectrometry?

[@thescavenger5003]

it's the same :)

[@nastaranghahremani2900]

The Scavenger thank you💕

[@tayyibah4765]

I’m sorry but, if I wanted a bunch of notes recited to me I would’ve done it myself

[@bentownsend4017]

The idea is this video is where you learn the information to write down in notes, not the other way round

[@Lopooop216]

she talks way to fast maybe talk a little bit slower 😁

[@lucafaggiani4401]

u are talking too fast mate

[@fatimaismael1438]

I love you

[@EmptyCerealbox_]

bro is sonic 💀

[@harry011984]

Good but you start going through the se things very quickly. Its a bit too fast!

[@overprime3978]

lifesaver

[@darshansharma2951]

Waste of money

[@priyankapanchal6665]

Pls help me

[@muhammadafaq3419]

love youuuuuuu

[@Wasteman365]

No one gives ‘afaq’