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Time of flight mass spectrometer calculations 

Crunch Chemistry
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This video takes you through how to rearrange the formula for kinetic energy to give velocity, and then how to use this in conjunction with knowing the length of the flight tube in calculating time of flight (and all the other variations). I also show you how to calculate the mass of a single ion from the isotope's molar mass.
If you are mathematically minded and can show how the equations are derived, brilliant! You need to be able to do this in examination questions.
If you are, like me, mathematically challenged, then spend some time studying how one equation comes from another, and memorise it - it's far easier in the long run.
😱 Correction for Q.1 - see photo of my notes on Google drive link for correct working and answer: drive.google.c...
You can find notes and exam style questions on this at crunchchemistr... 😀.

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6 окт 2024

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Комментарии : 36   
@CrunchChemistry
@CrunchChemistry 3 года назад
Please click link (Google drive photo) for correction to Q1 - huge apologies! 😊 drive.google.com/file/d/1RindprJmQOrq0t6-j95Ww9KSB5CqQs7U/view?usp=sharing
@pickle_1395
@pickle_1395 3 месяца назад
revisiting this video the night before my chem paper 1
@anonymous-iu4th
@anonymous-iu4th 2 года назад
Thanks I've been trying to understand TOF for ages my textbook has absolutely none of the calculations or even any of the formulas
@CrunchChemistry
@CrunchChemistry 2 года назад
I'm really pleased this video has ticked all the boxes - unfortunately your textbook is only ever going to give you an overview of any topic at A level, so you need to mine your teachers' / school / college expertise and past papers. There is a bank of TOF exam questions with detailed worked through answers at crunchchemistry.co.uk in the Atoms, Ions and Molecules unit 😊
@anonymous-iu4th
@anonymous-iu4th 2 года назад
@@CrunchChemistry thank you
@bilalhussain3966
@bilalhussain3966 Год назад
Hi, you should use unrounded values to calculate your answers and only round at the end because it effects the accuracy of your answer. With unrounded values aka accurate values I got 5.31*10^-6s
@CrunchChemistry
@CrunchChemistry Год назад
Absolutely - number one rule is not to round up to 2 or 3 sig fig during any calculation, but the settings on your calculator (as in to how many sig fig or decimal places it cuts off your calculations) also explains why answers may vary
@pickle_1395
@pickle_1395 Год назад
What a helpful video. Thanks !
@elisaelakaradag6348
@elisaelakaradag6348 6 месяцев назад
Thank you so much! seriously the way you explain things really helped me understand.
@abaakofa1399
@abaakofa1399 4 года назад
So helpful! Thank you
@CrunchChemistry
@CrunchChemistry 4 года назад
The key is to mastering this is practice - I know the text books are a bit useless on ToF calculations, so scour the past papers for questions.
@JosephAdamu-fi7mq
@JosephAdamu-fi7mq 14 дней назад
amazing
@notsezz5318
@notsezz5318 4 года назад
appreciate the help thanks
@CrunchChemistry
@CrunchChemistry 4 года назад
And thanks for the feedback - go practice!
@oldmanjenkins3245
@oldmanjenkins3245 3 года назад
thank you
@m09nbby18
@m09nbby18 4 года назад
thank you so much!!!
@itzbigdelly3118
@itzbigdelly3118 Год назад
Hi, thanks for the video and I now fully understand TOF but, on the last question, could you explain to me how you were able to get a time of 5.23 x 10^-6 because I got 5.27 x 10^-, unless my answer as well is accepted?
@CrunchChemistry
@CrunchChemistry Год назад
So pleased you have got this sorted - I've gone back to my original video notes and I also have an answer of 5.268 x 10^-6s so another typo and another apology 😐
@laurenhancock4181
@laurenhancock4181 3 года назад
thanks- super helpful!
@CrunchChemistry
@CrunchChemistry 3 года назад
I'm so pleased it helps 😊
@ashd1680
@ashd1680 3 года назад
thanks for saving me in my test gyal
@CrunchChemistry
@CrunchChemistry 3 года назад
You're welcome 🎉
@sophiedresner8787
@sophiedresner8787 Год назад
Hello, great video this has really helped me understand TOF calculations, in the last question I got 5.314747263 x 10^-16, ( rounded it up to 5.3 however ), I think this is due to me not rounding the numbers up until the end so will there be a range the answers is in?
@CrunchChemistry
@CrunchChemistry Год назад
You shouldn't round up until your final answer, then cut it off at the appropriate number of significant figures - your answer will be fine x 10^-6 not x10^-16? (it can depend slightly on calculator settings).
@sophiedresner8787
@sophiedresner8787 Год назад
@@CrunchChemistry yeah I never round up until my final answer and oh yeah 10^-6 lol, thank you again!
@m09nbby18
@m09nbby18 4 года назад
Could you perhaps consider doing ionic equations?
@CrunchChemistry
@CrunchChemistry 4 года назад
Have a look in the atoms. ions and molecules playlist - there is one ready for you!
@joseaelizabeth4938
@joseaelizabeth4938 3 года назад
Can someone tell me how the mass calculation in the first question works
@CrunchChemistry
@CrunchChemistry 3 года назад
Where have I lost you specifically? Let me know and I'll work through it with you.
@joseaelizabeth4938
@joseaelizabeth4938 3 года назад
@@CrunchChemistry in the first one i worked out the mass the same way you did it and i ended up with a completely different number
@CrunchChemistry
@CrunchChemistry 3 года назад
@@joseaelizabeth4938 I'm so sorry, you are quite right, the mass should be 3.985 x 10-26kg from the Mg ion. See the link in the pinned comment for the working from my notes.
@chu2000
@chu2000 Год назад
in a MS where a tof question is 3 marks why is the mass used for 49Ti + not 49/6.022x1023 /1000 but its just 49. so the answer for question is much bigger than mine
@CrunchChemistry
@CrunchChemistry Год назад
Sorry, I've only just seen this! I'd need to see the whole question but you've probably figured it out now.
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