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# Cambridge Chemistry Challenge watch

1. (Original post by Snakefingers13)
The graph in silver refers to a specific series of compounds in chemistry. You'll want to multiply your answers in Celsius. Small margin of error allowed though, so be careful where you get your values.
Have pm'ed you (so I don't spoil it for others)
2. Yay finished!
Message for hints!
3. (Original post by droplet739)
Yay finished!
Message for hints!
Hints here:
Entry:
Spoiler:
Show
Try to figure out what the statue is. Look up the coordinates, they'll help. The question talks about food? What's doing the eating? What does it eat? What's the empirical formula for this foodstuff? There's your answer.

Copper:
Spoiler:
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Each set of scales shows a reaction. In each one, two products can be formed. One is the major product (heavier on the scales), and the other is the minor product. There's a rule to find which product is the major one. Whose rule is this?

Silver:
Spoiler:
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The graph shows the boiling and melting points for a common series of organic molecules. It's one of the most basic homologous series. That should be enough to get you going.

Gold:
Spoiler:
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7 people, 7 molecules. Each person found the structure of one of the molecules. Match them up. Each of the women (A, R, T) were Nobel prize winners. Reverse image search helps here. If you've got only 2 or 3 left, that's only 2 or 6 possibilities. You can just try them all, from this point! Also, 0-6 are essentially in chronological order. The people are crystallographers.

Roentgenium:
Spoiler:
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They give you the graph of a distribution. Identify this distribution, find its wikipedia page. Look at the pdf given in the grey box in the top right. Solve that for a, then use the equation for a in the Distribution function section of the article. Find m, then the Mr. If your Mr seems too big, try dividing by 1000.

Hope this helps!
4. Rg seems impossible. I put in so many hours for just this one level but all in vain.
5. (Original post by ChemistryQuiz)
Rg seems impossible. I put in so many hours for just this one level but all in vain.
how far did you get on Rg?
I've been stuck on it for hours too
6. yep im stuck on rg to can someone pm or help me
i get an mr of 619.4
7. hey, im stuck on roentgenium, (possible spoiler), I think that the graph is a boltzman distribution graph, but it asks which gas it is, while i see posts talking about numbers, what kind of answer is this looking for ?
8. I think you calculate the mr and then work out the chemical formula of the gas, problem is i don't know how to work out the formula. Should be a compound tho because I've tried all the element that are gases at room temp
9. I have seen that a lot of people are stuck on Rg. To be honest, I don't know how I managed to get the result - it looked so hopeless. So I am going to give some straightforward help full of spoilers - use at your own risk.

Spoiler:
Show

Most of you will probably have guessed this is a Boltzmann distribution. Certainly the best method to research the questions is to use Google and Wikipedia - try to do this with the Boltzmann distribution article. Also, you have two ordered numbers in the problem - try to think how they might be used to get the Mr of the gas:

Spoiler:
Show

Use the very complicated formula on the Wikipedia page connecting v, f(v) and m. The ordered pair in the problem consists of v and f(v), so you only need to calculate m. This is not a trivial task with this horribly complicated equation, so I personally used Wolfram Alpha to do this.

After you get the mass you're halfway through. Can you think how you can relate the mass to the molar mass?

After you do this, you get a result, which in my case wasn't 100% correct but should be alright because there aren't that many gases with this particular molar mass.
Spoiler:
Show

If you've calculated correctly, you'll get a pretty heavy gas. There aren't too many of them. Try to google or think of some
Spoiler:
Show

Be careful with the spelling while plugging in the name

10. Finished! Thanks to those who posted tips on here! I am also happy to help anyone who needs it, just PM me
11. (Original post by Godzilla123)
I have seen that a lot of people are stuck on Rg. To be honest, I don't know how I managed to get the result - it looked so hopeless. So I am going to give some straightforward help full of spoilers - use at your own risk.

Spoiler:
Show

Most of you will probably have guessed this is a Boltzmann distribution. Certainly the best method to research the questions is to use Google and Wikipedia - try to do this with the Boltzmann distribution article. Also, you have two ordered numbers in the problem - try to think how they might be used to get the Mr of the gas:

Spoiler:
Show

Use the very complicated formula on the Wikipedia page connecting v, f(v) and m. The ordered pair in the problem consists of v and f(v), so you only need to calculate m. This is not a trivial task with this horribly complicated equation, so I personally used Wolfram Alpha to do this.

After you get the mass you're halfway through. Can you think how you can relate the mass to the molar mass?

After you do this, you get a result, which in my case wasn't 100% correct but should be alright because there aren't that many gases with this particular molar mass.
Spoiler:
Show

If you've calculated correctly, you'll get a pretty heavy gas. There aren't too many of them. Try to google or think of some
Spoiler:
Show

Be careful with the spelling while plugging in the name

No need to plug the name in, chemical formula is perfectly acceptable
12. hey, i have done the whole thing, but i feel like i half cheated the rg, can someone walk me through the steps and the scientific
principles and reasoning behind them ?
13. Hi! i am going to do physics and chemistry's exams for 12-13 years old.
They were exams from Cambridge, and I need them to do my test better in several weeks.
Can you help me to find these exam? In chemistry's exam was question about Al2O3, I think it was exam 2013.
And physics maybe too 2013 year, there was question about nuclear Power Plant.
14. An hour and a half to go! Anyone online?
15. (Original post by fizzers)
An hour and a half to go! Anyone online?
I'm stuck on silver :/
16. stuck on gold :/
17. anyone got tips on gold??
I'm stuck on silver :/
19. Gold is a real pain today
20. (Original post by selenerrr__x)
stuck on gold :/
Same!

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