A-level Chemistry Study Group 2020-21
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Original post by Jlingz22
guys how do you work out the moles of each one in this question
guys how do you work out the moles of each one in this question
Use a RICE table
Reaction ratio
Initial moles
Change in moles
Equilibrium moles
Original post by MTChemist
i got
0.7 A
6.4 ethanol
3.6 water
0.7 A
6.4 ethanol
3.6 water
Looks good
Original post by 22lfd
how did you all find the a level cie chem paper? heard it was awful hope you all the best
what is cie?
Original post by damsellinstress
what is cie?
CIE Exam board.
Original post by CaptainDuckie
CIE Exam board.
oh right ty
Original post by 22lfd
how did you all find the a level cie chem paper? heard it was awful hope you all the best
did you do the locked 2020 papers?
Original post by 22lfd
how did you all find the a level cie chem paper? heard it was awful hope you all the best
..
(edited 2 years ago)
Original post by JaiG20
Anyone can help with this ... why is the Answer B?
It’s not going to be exactly 1 as it is an average and there are no isotopes with mass less than 1 but some with a mass more than 1 (deuterium and tritium). It’s not 1.5 or 2 as it’s a weighted average and the isotope with mass 1 is significantly more heavily weighted.
Hi can someone please help me with this.. how do i calculate the mass needed and also if i wrote first you need to oxidise under reflux then the next step is esterification would i be correct? What else do i need to do to get 6/6?? Thank you in advance!
for (i)
(edited 2 years ago)
Original post by Usman01
DM jake.barns__ on insta for:
All 2020 papers with ms,
AQA Biology
AQA Chemistry
Edexcel Maths
AQA physics
For Sale
All 2020 papers with ms,
AQA Biology
AQA Chemistry
Edexcel Maths
AQA physics
For Sale
you can get disqualified for this please stop
Hello guys, I have literally no idea what this question means. Any help would be appreciated.
Original post by dav3415s
Hello guys, I have literally no idea what this question means. Any help would be appreciated.
The molar ratio is 2 + 7 -> 4 + 6
2 moles = 100cm^3 so 1 mole = 50 cm^3
Work out the change in moles of gas then convert to cm^3
Remember one mole at the same pressure and temperature takes up the same volume no matter what the gas is
Original post by Hellllpppp
The molar ratio is 2 + 7 -> 4 + 6
2 moles = 100cm^3 so 1 mole = 50 cm^3
Work out the change in moles of gas then convert to cm^3
Remember one mole at the same pressure and temperature takes up the same volume no matter what the gas is
2 moles = 100cm^3 so 1 mole = 50 cm^3
Work out the change in moles of gas then convert to cm^3
Remember one mole at the same pressure and temperature takes up the same volume no matter what the gas is
Ahhhhh, so the answer would be A as the change in moles is 1, and 1 mole is 50 cm^3
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