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# Cambridge Chemistry Challenge watch

1. Stuck on the last one. I know the country, just have no idea what to do from there
2. (Original post by Groggle)
Stuck on the last one. I know the country, just have no idea what to do from there
Maybe consider the element named after the country?
3. has anyone done/is doing the paper?
4. (Original post by jennywren42681)
has anyone done/is doing the paper?
hi! i did the paper on monday.

it was... tough. :p
5. yeah, i did the paper yesterday. how did you find the deuterium questions, they were the hardest part i thought.
6. found myself guessing most of the first question, and feeling like a fool for it... second question was alright. kind of. hahaha.
7. What is the answer to the first question.. i'm at purple and i'm stuck.! HELPPPPP please!
8. its a type of purple, not just 'purple'
9. anyone doing the latest one?
10. yeah! I've been stuck on the roentgenium question for days though . How are you finding it?
11. yeah! I've been stuck on the roentgenium question for days though . How are you finding it?
completed it yesterday
how many letters have you got?
12. Stuck on silver, tips anyone??
13. (Original post by Ww246)
Stuck on silver, tips anyone??
ditto
14. Stuck on silver, tips anyone??
1) GOLDEN TIP - in any numerical question, I recommend using a spreadsheet so that if you change a number it automatically updates the answer - have one column with your numbers and calculations in and then the column next to it as your units so that you can see what you've done and where you need to go next

2) look at the axes and see if you can input any info given to you into one axis to read off something from the other
3) don't get confused by the ppm => 1 ppm = 1 mg/dm^3
4) you are given it's name so you can find out it's Mr
5) i didn't actually use the density (as i used the Mr instead)

hope this helps
15. still stuck . Did you get 4.5 ppm? And if so what do you do after?
16. (Original post by jennywren42681)
1) GOLDEN TIP - in any numerical question, I recommend using a spreadsheet so that if you change a number it automatically updates the answer - have one column with your numbers and calculations in and then the column next to it as your units so that you can see what you've done and where you need to go next

2) look at the axes and see if you can input any info given to you into one axis to read off something from the other
3) don't get confused by the ppm => 1 ppm = 1 mg/dm^3
4) you are given it's name so you can find out it's Mr
5) i didn't actually use the density (as i used the Mr instead)

hope this helps
thanks, and the density confused me loads cause i didnt know where to use it. ill have another go now

done it now, thanks, it was the ppm that got me
17. (Original post by Ww246)
still stuck . Did you get 4.5 ppm? And if so what do you do after?
think carefully about what the 4.5 refers to - it's not the ppm but you've got the first stage right
18. Sorry I misread >.<, so I end up with 31622 ppm. How do I find the volume and moles with two densitys' ?
19. (Original post by Ww246)
Sorry I misread >.<, so I end up with 31622 ppm. How do I find the volume and moles with two densitys' ?
i didnt use the density at all. you know the compound so you know the mr of the compound. so you mess aroiund with the numbers to change mg/dm3 to mol/dm-3
20. Whats the name of the compound for the entry level question? And can someone explain how they did it? thanks!

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