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  1. J

    June 2013 Edexcel exams!

    Although it's for the AS Practical Assessment, there's a lot of theory involved, so you can use it as a guidance to make notes.
  2. J

    June 2013 Edexcel exams!

    Okay let's use question 1 from June 2012 as an example, you have to find the mean and uncertainty of the following values: 0.27 mm, 0.29 mm, 0.26 mm, 0.42 mm, 0.26 mm. Now, 0.42mm is an obvious anomaly because it is way above the other values, so we're going to discard that and not use it in any...
  3. J

    Chemistry Unit 3B Help

    Okay, great, thanks!
  4. J

    Chemistry Unit 3B test of ions. How to study?

    No problem :) Best of luck! Let me know how you diddd
  5. J

    May/June 2013

    Im doing AS Chemi and Phys, C1, C2, S1 and AS Business Studies and spanish, so netvous:(
  6. J

    June 2013 Edexcel exams!

    I havent made any notes for phys unit 3b you just need to revise units 1 amd 2 and do as many past papers as you can for that:( however, i have an edexcel document which has a lot of info about unit 3b, ill post that tomorrow morning, mybee it helps you a bitt. Have you begun revising yet?
  7. J

    June 2013 Edexcel exams!

    Although you figured it out, i just wanted to point out that there are two ways of finding the uncertainty: 1. Highest value - mean The highest value from the set of values you used to calculate the mean with 2. Range/2 Again, the range should be calculated from the set of values you used to...
  8. J

    Chemistry Unit 3B Help

    Ohhhh okay that makes sense, thank you soooo much!!! And how am I supposed to know that lithium oxide is the white solid? It isn't mentioned anywhere in the user guide :(
  9. J

    chem 3B

    They're all on Edexcel's official site, they might be called Paper 7, search for them there
  10. J

    Chemistry Unit 3B test of ions. How to study?

    Use this, see if it's to any use for you. It's practically all you need to know for Unit 3B, remember to also learn your diagrams for distillation and reflux, and remember that calcium chloride is a drying agent!
  11. J

    June 2013 Edexcel exams!

    Good luck!
  12. J

    June 2013 Edexcel exams!

    I'm doing Chemi Units 1, 2, 3 and same for Phys. Also doing Maths C1, C2 and S1. I'm so nervous :( Here are some notes I made up, I hope they help:
  13. J

    Chemistry Unit 3B Help

    A double bond is made up of a pie bond and a sigma bond, whereas a single bond is made up of solely a sigma bond
  14. J

    Chemistry Unit 3B Help

    But the edexcel user guide states that "group 1 nitrates (other than Li) evolve oxygen" so how can lithium nitrate evolve oxygen?
  15. J

    Chemistry Unit 3B Help

    I was revising for my Paper 3b using past papers, and i have a problem: In the May 2010 question paper of Edexcel, Unit 3b, I don't understand question 1 at all. In the user guide it says that on heating a carbonate, carbon dioxide is released for carbonates of metals except Group 1, so why is...
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