Just one sec...
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Cambridge Chemistry Challenge

Announcements Posted on
Take our short survey, £100 of Amazon vouchers to be won! 23-09-2016
    Offline

    0
    ReputationRep:
    Stuck on the last one. I know the country, just have no idea what to do from there
    Offline

    3
    ReputationRep:
    (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?
    Offline

    0
    ReputationRep:
    has anyone done/is doing the paper?
    Offline

    1
    ReputationRep:
    (Original post by jennywren42681)
    has anyone done/is doing the paper?
    hi! i did the paper on monday.

    it was... tough. :p
    Offline

    0
    ReputationRep:
    yeah, i did the paper yesterday. how did you find the deuterium questions, they were the hardest part i thought.
    Offline

    1
    ReputationRep:
    found myself guessing most of the first question, and feeling like a fool for it... second question was alright. kind of. hahaha.
    Offline

    0
    ReputationRep:
    What is the answer to the first question.. i'm at purple and i'm stuck.! HELPPPPP please!
    Offline

    0
    ReputationRep:
    its a type of purple, not just 'purple'
    Offline

    0
    ReputationRep:
    anyone doing the latest one?
    Offline

    0
    ReputationRep:
    yeah! I've been stuck on the roentgenium question for days though . How are you finding it?
    Offline

    0
    ReputationRep:
    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?
    Offline

    0
    ReputationRep:
    Stuck on silver, tips anyone??
    Offline

    0
    ReputationRep:
    (Original post by Ww246)
    Stuck on silver, tips anyone??
    ditto
    :confused:
    Offline

    0
    ReputationRep:
    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
    Offline

    0
    ReputationRep:
    still stuck . Did you get 4.5 ppm? And if so what do you do after?
    Offline

    0
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    Sorry I misread >.<, so I end up with 31622 ppm. How do I find the volume and moles with two densitys' ?
    Offline

    0
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    Whats the name of the compound for the entry level question? And can someone explain how they did it? thanks!
 
 
 
Write a reply…

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: August 18, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
Who is going to win Bake Off?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.