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  1. Casablanca

    Chemistry: Post your doubts here!

    Thank you all so much for your help, I have my chemistry MCQs in about 8 hours so I'm going to head off to bed now. Best of luck to all of you, and I hope you get the best grades possible. :D Remember to wish me luck in your hearts as well, as you all know, I'm going to need all the luck I can...
  2. Casablanca

    Chemistry: Post your doubts here!

    "the answer is C since the moles of CO2 produced=atoms of CO2: 1mol=24dm3thus 24000cm3 mols that occupy 72cm3=72/24000 moles that occupy72cm3=3*10^-3 so carbon atoms=3*10^-3 mass of this carbon atoms= 3*10^3*12(mr) mass=.036g mass of almunium=mass of compund-mass of carbon atoms mass of...
  3. Casablanca

    Chemistry: Post your doubts here!

    Found it. I was right, the answer is C. :D
  4. Casablanca

    Chemistry: Post your doubts here!

    When trying to increase the value of Kc for an exothermic reaction, should the temperature be increased or decreased? :/
  5. Casablanca

    Chemistry: Post your doubts here!

    Yeah, I don't know this one either. I'll type the question so it's easier for people to answer: 0.144 of an aluminum compound X react with an excess of water to produce a gas. This gas burns completely in O2 to form H2O and 72cm^3 of CO2 only. The volume of CO2 was measured at room temp. and...
  6. Casablanca

    Chemistry: Post your doubts here!

    Ah, so there are 6? Thanks a lot, I appreciate the effort. :)
  7. Casablanca

    Chemistry: Post your doubts here!

    I thought it was 3.
  8. Casablanca

    Chemistry: Post your doubts here!

    No idea. I don't have the marking scheme. ._.
  9. Casablanca

    Chemistry: Post your doubts here!

    Someone please answer this. :cry:
  10. Casablanca

    Chemistry: Post your doubts here!

    -Start backwards. It saves time. -Use process of elimination. You may not know what is correct, but you might know what is wrong, so don't worry about those options and focus on the others. (Especially useful in the last 10 questions) -Use trial and error. Where possible, plug in the values from...
  11. Casablanca

    Why bother

    We had MUN here. Model United Nations. They're similar.
  12. Casablanca

    Chemistry: Post your doubts here!

  13. Casablanca

    Why bother

    What can I say, I enjoy a good argument, regardless of how irrelevant and pointless the topic is! :P
  14. Casablanca

    Chemistry: Post your doubts here!

    Oxidation.
  15. Casablanca

    Why bother

    Well, if you don't know, and did it correctly, that's well and good, but if you happened to find out what was coming through no fault of your own (meaning you chanced upon it without actively seeking it out) then: 1. You can't be called a cheater, since you're not to blame. 2. It's not even...
  16. Casablanca

    Chemistry: Post your doubts here!

    How many isomers with the structure C5H10 have structures involving pi bonds? A. 3 B. 4 C. 5 D. 6 Why?
  17. Casablanca

    Why bother

    It's called a "snip". It is commonly used in forums when a post is too long and you don't want to take up too much space repeating the same words. It's not meant to be offensive, so calm down. And yeah, you DID say that. "If you know what material is used for an experiment you obviously do...
  18. Casablanca

    Chemistry: Post your doubts here!

    May/June 2011 Paper 9701/12, question 8. So... is it C or D? :P
  19. Casablanca

    Chemistry: Post your doubts here!

    Which formulae show propanone and propanal as different compounds? A. Emperical, molecular, structural and displayed formulae. B. Molecular, structural and displayed formulae. C. Structural and displayed formulae only. D. Displayed formulae only. I think it's C. Can someone confirm this, please?
  20. Casablanca

    Chemistry: Post your doubts here!

    Thanks.
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