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# Cambridge Chemistry Challenge watch

1. (Original post by jonzza_81)
write the elements in order of atomic mass, space between the symbols, no commas
Thanks, on to silver now
2. (Original post by amtheril)
Spoiler:
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are the symbols in copper "Sb, W" ?
Spoiler that.
3. (Original post by alow)
Spoiler that.
yeah sorry I will take it down
4. (Original post by alow)
Spoiler that.
can you show me how to do Rg? I keep getting the value of 0.000104 hours, but this is obviously wrong.
5. (Original post by amtheril)
can you show me how to do Rg? I keep getting the value of 0.000104 hours, but this is obviously wrong.
Spoiler:
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Use a DE to model how long it would take to fill the balloon.
6. (Original post by alow)
Spoiler:
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Use a DE to model how long it would take to fill the balloon.
What is DE?
7. (Original post by amtheril)
What is DE?
I don't understand
8. (Original post by amtheril)
I don't understand
Differential equation.
9. (Original post by ElMoro)
...
I hate cambridge!
10. You don't need diffs to answer Rg
My chemistry teacher gave everyone this sheet to help
Spoiler:
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11. (Original post by jonzza_81)
You don't need diffs to answer Rg
My chemistry teacher gave everyone this sheet to help
Spoiler:
Show
That uses the integrated form of the DE.
12. (Original post by alow)
That uses the integrated form of the DE.
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?
13. (Original post by amtheril)
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?
by the way thank you for putting in the effort of taking the photograph - it should have helped me alot
14. (Original post by amtheril)
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?
Close, but no cigar.

For that picture, it's really just a ****ty way of solving

You should be able to work out what k and A are pretty easily.

As for where you're going wrong:
Spoiler:
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I think you may be using RTP not STP
15. (Original post by alow)
Close, but no cigar.

For that picture, it's really just a ****ty way of solving

You should be able to work out what k and A are pretty easily.

As for where you're going wrong:
Spoiler:
Show
I think you may be using RTP not STP
alow you do me too much honour!!!
16. hey im on the gold challenge, but my poor year 11 brain cant handle this, i think its something to do with it being a crystal (ionic lattice), ive tried using CPK colouring to determine the elements but that doesn't work, i think the fractions are just to show the position on the atom, but are they more relevant, any useful tips for figuring it out ??
17. Guys it's almost May!!
18. (Original post by fizzers)
Guys it's almost May!!
ARE YOU EXCITED
because I am

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19. YES OF COURSE
although i feel like i won't be happy for too long bc I'll probably be frustrated more than aything
20. (Original post by fizzers)
YES OF COURSE
although i feel like i won't be happy for too long bc I'll probably be frustrated more than aything
That is true
Also I really enjoy sleep and I'm not likely to get any tonight
OH WELL

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