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# Cambridge Chemistry Challenge watch

1. (Original post by Snakefingers13)
Any hint on Rg?

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It's no fun, but it turns out I did it the long way.

The hint I'll give is that the "I" is actually the thickness. I spent quite a while trying to find some strange "I" value for ice. Also don't get side-tracked with weird types of ice as I did
2. Any help on gold?
3. (Original post by Silverland)
It's no fun, but it turns out I did it the long way.

The hint I'll give is that the "I" is actually the thickness. I spent quite a while trying to find some strange "I" value for ice. Also don't get side-tracked with weird types of ice as I did
So work out the volume and use number density?

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4. all the black atoms are of carbon in silver?
5. Finished - annoyingly I had all the correct info for Rg for 20 minutes, but made a blindingly obvious arithmetic error...
6. (Original post by DavidH20)
Finished - annoyingly I had all the correct info for Rg for 20 minutes, but made a blindingly obvious arithmetic error...
Did you use 0.9167 gcm^-1 for density?

Edit: nevermind, I missed off 2 zeros typing the answer into the box

I can go to bed!
7. (Original post by Conan)
Did you use 0.9167 gcm^-1 for density?

I can't see where I am going wrong, I've worked out the volume of whole flake, multiplied by 34/49, multiplied by the density, divided by 18 and multiplied by avagadro's constant
I did. Why have you multiplied by 34/49?
8. (Original post by DavidH20)
I did. Why have you multiplied by 34/49?
It was the simplied form of the fraction the snowflake occupied. I think I somehow missed a few zeros typing it into the answer box the first time, then I spent about 10-15 minutes wondering why that answer doesn't work. Typed it in again and it worked!
9. (Original post by Conan)
It was the simplied form of the fraction the snowflake occupied. I think I somehow missed a few zeros typing it into the answer box the first time, then I spent about 10-15 minutes wondering why that answer doesn't work. Typed it in again and it worked!
I know how you feel - I forgot to divide by 18 for 20 minutes
10. Ha! Just noticed I beat my school chem rival who got a chem offer from Oxford by a good 3 minutes. It's only a small pacification, but I'll enjoy making it out that I didn't get through on blind luck :')
11. whats 0.02mm?
12. Ugh, 89th. That's annoying since I decided the area of the blue section was 206/294, not 204/294.

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13. (Original post by Snakefingers13)
Ugh, 89th. That's annoying since I decided the area of the blue section was 206/294, not 204/294.

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Never in my life have I counted blue triangles so frantically!

Also is it nice in Castleford?
14. (Original post by lpdsr)
whats 0.02mm?
the thickness of the flake.
15. (Original post by Silverland)
Never in my life have I counted blue triangles so frantically!

Also is it nice in Castleford?
It's the bastion of culture and intellect in Yorkshire. Also Greggs do a really nice chicken pasty.

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16. Decent quiz this month. Entry and Cu were far too easy, (Cu literally took a two-word Google search with I'm Feeling Lucky), Silver was thought-provoking and quite tricky.
Gold follows the trend of being a rather easy calculation, and Rg was far too reminiscent of that beast of a carbon nanotube question last month. I'm all for tricky maths, but there's never a guide on what sig figs are accepted etc.

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17. Omg I don't know what I am doing wrong I must have worked the volume wrong but don't know how!!!!!

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18. (Original post by Snakefingers13)
It's the bastion of culture and intellect in Yorkshire. Also Greggs do a really nice chicken pasty.

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Ha! I recall having a rather nice Steak & Mushroom lattice from a Greggs once. Even the name sounds like what a chemist would ask for
19. whats the order of magnitude of the number of molecules?
20. Any tips on entry? I have no idea how to go about it, do I use simultaneous equations? Sorry, only found this challenge today lol

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