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Cambridge Chemistry Challenge

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The last question is so confusing >.<
Reply 61
Avatar for Ste2210
Ste2210
did u finish it in the end? and are we all ready for the final quiz of the year!!
Done it! I may be 168th and most likely the last person but ah well! :colone: Only knew it existed about a week into may and stopped for exams for most of it :smile:
anyone doing this month's challenge?
Reply 64
Avatar for CM23925
CM23925
done it
same - it was an easier one this month :smile:
I cant even do the entry question :frown:

Im getting almost purple but cant work it out =/
(edited 12 years ago)
Im stuck on the second, i feel sooo smart >.<
Reply 68
Avatar for CM23925
CM23925
Original post by Emissionspectra
I cant even do the entry question :frown:

Im getting almost purple but cant work it out =/


do you know what the 2 purple atoms in the structure are?
Original post by CM23925
do you know what the 2 purple atoms in the structure are?


I did it im on silver but have no idea what the reaction even is
Reply 70
Avatar for CM23925
CM23925
Original post by Emissionspectra

Original post by Emissionspectra
I did it im on silver but have no idea what the reaction even is


you don't need to, search for the reaction involving those reagents
(edited 12 years ago)
Original post by CM23925
you don't need to, search for the reaction involving those reagents


yeah but i thought it may help me to work out who its named after
Reply 72
Avatar for CM23925
CM23925
Original post by Emissionspectra

Original post by Emissionspectra
yeah but i thought it may help me to work out who its named after


yeah but if you already knew what the reaction was you wouldn't need to think about the question. the point is you have to work/find out what the reaction is. and i just told you how ^
Can anyone give me a hint for the second?
Reply 74
Avatar for gwengwen
gwengwen
Original post by dream_merchant
Can anyone give me a hint for the second?

[EtOH] = concentration of ethanol in the wine
find the density of ethanol on the internet
then use the equation density=mass/volume
as 13.5% , so 135cm3 of C2H5OH in 1dm3 of wine
and then work out the mass of the ethanol
then finally work out the concentration!
hope this help ! :smile:
Done It :smile:
Original post by gwengwen
[EtOH] = concentration of ethanol in the wine
find the density of ethanol on the internet
then use the equation density=mass/volume
as 13.5% , so 135cm3 of C2H5OH in 1dm3 of wine
and then work out the mass of the ethanol
then finally work out the concentration!
hope this help ! :smile:


Ahh, so your finding the concentration of ethanol.. No wonder ive been confused, been doing everything right but been finding the moles :/ Silly me :biggrin:

Thanks
Reply 77
Avatar for gwengwen
gwengwen
Original post by dream_merchant
Ahh, so your finding the concentration of ethanol.. No wonder ive been confused, been doing everything right but been finding the moles :/ Silly me :biggrin:

Thanks


good luck! :smile:
Reply 78
Avatar for Chuck12
Chuck12
Original post by CM23925
do you know what the 2 purple atoms in the structure are?


Apparently not... because the answer i put down isnt correct
Goooooooooooooooooooooooooooold

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