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# Cambridge Chemistry Challenge watch

1. Yes I did it! Guys, it's a very very simple formula that I found by reading this paper when googling "density of nanotubes as a function of their diameter". It's just using graphene's surface area per gram. Find that paper okay?
2. Help with copper! Any hint, please!
3. (Original post by lpdsr)
Help with copper! Any hint, please!
Copper is to do with the densities of those elements.
4. (Original post by Randophera)
Yes I did it! Guys, it's a very very simple formula that I found by reading this paper when googling "density of nanotubes as a function of their diameter". It's just using graphene's surface area per gram. Find that paper okay?
Hey, I've been stuck for 2 hours. I found the density was 0.77 mg/m^2. Is that density the one you used? Because it says the answer is wrong D:
5. (Original post by lpdsr)
Help with copper! Any hint, please!
Search the density of those elements in wikipedia. You'll find something interesting
6. (Original post by Scattereddreams)
Search the density of those elements in wikipedia. You'll find something interesting
thanks! now I'm stuck in silver =/
I already know what is required, but I dont find only 3 elements, I find much more!
7. (Original post by lpdsr)
thanks! now I'm stuck in silver =/
I already know what is required, but I dont find only 3 elements, I find much more!
Make a list with the full names of the ones you have and google them.
8. (Original post by Scattereddreams)
Make a list with the full names of the ones you have and google them.
I did this, but I cant find the exactly elements... it can make so many words...
9. (Original post by lpdsr)
I did this, but I cant find the exactly elements... it can make so many words...
Try again. It's very easy to find
10. (Original post by lpdsr)
I did this, but I cant find the exactly elements... it can make so many words...
got it!!
11. I have to use henderson in gold?
12. (Original post by lpdsr)
I have to use henderson in gold?
No.
13. (Original post by Scattereddreams)
No.
And how to write the scientific notation? Conventional Ka=1,8x10^-5, right? I found the answer, but doesnt fix
14. (Original post by lpdsr)
And how to write the scientific notation? Conventional Ka=1,8x10^-5, right? I found the answer, but doesnt fix
Write it as a decimal
15. (Original post by Scattereddreams)
Write it as a decimal
with how many significant figures? sorry =/
16. (Original post by lpdsr)
with how many significant figures? sorry =/
I think four
17. (Original post by Scattereddreams)
I think four
its going wrong! Wich value of ka I must use? I think this is deviating the real result
18. (Original post by lpdsr)
its going wrong! Wich value of ka I must use? I think this is deviating the real result
1.8*10^-5
19. =)

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