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  1. I

    Chemistry MCQ thread...

    gaseous bromine is not purple. It's orange/brown So it's a typo
  2. I

    Chemistry MCQ thread...

    It'd be nicer if u can upload the question with screenshot CH3CH2OH + CH3CO2H ---> CH3CO2CH2CH3 + H2O 30g for both ethanol and ethanoic acid Mr(CH3CH2OH) = 46 Mr(CH3CO2H) = 60 So 0.65 mole of ethanol, and 0.5 mole of ethanoic acid present with ethanoic acid being a limiting agent. That...
  3. I

    Chemistry MCQ thread...

    Oh shoot I wrote up everything and i think it's all disappeared. Anyway, I think enthalpy change of neutralisation depends on how strong an acid/base is. Strong acid + strong base --> high enthalpy change and vice versa. Nitric acid = quite weak acid, ammonia = weak base, KOH = strong base...
  4. I

    Chemistry MCQ thread...

    1. Set up equation. 2X(NO3)2 --> 2XO + 4NO2 + O2 (I'm sure u did this step but just to make sure.) And we know 2X(NO3)2 is 5.0g, and 3.29g is lost. The lost mass represents masses of 4NO2 and O2 since 2XO is the only solid here. 2X(NO3)2 --> 2XO + 4NO2 + O2...
  5. I

    Chemistry MCQ thread...

    A?
  6. I

    Chemistry MCQ thread...

    3 peaks observed. I'll show workings if u confirm
  7. I

    Chemistry MCQ thread...

    Calcium?
  8. I

    Chemistry MCQ thread...

    Oh, right. I didn't consider H2O. Tbh I don't think this question is 'easy' mate. Well if we set up equation 1. CH4 + 2O2 --> CO2 + 2H2O (20cm^2 of O2 used, 10cm^2 of CO2 formed ) so 70-20+10 = 60 2. C2H6 + 3.5O2 --> 2CO2 + 3H2O (35cm^2 of O2 used, 20cm^2 of CO2 formed)...
  9. I

    Chemistry MCQ thread...

    Ah sorry, didn't even know he asked q8 Yeah q8 is straight forward. I meant q4
  10. I

    subjects?

    lol Marine science => if u like dolphins n stuff, go for it Environmental management => how to farm efficiently, how to mine efficiently.. etc Food studies => wanna know what's in hamburgers? You'll do great.
  11. I

    Chemistry MCQ thread...

    Wow.. I have NO IDEA after looking at it for 20 minutes.. damn
  12. I

    chanllenging mcqs

    Btw I'm not 100% sure. Plz explain to me if i'm wrong
  13. I

    chanllenging mcqs

    1 only?
  14. I

    chanllenging mcqs

    D?
  15. I

    Need a help on predicting my Alevel grades.

    @hassam wow 38 in MCQs -.- u must be very clever Hmm.. I think ur UMS depends on where u lose mark. Since 1 mark in p2/p1 worth approx. 1.5 times 1 mark in p3, if ur 'lost marks of 20' mostly come from p3, then hell yes u'll get 95+ Even if most of them are from p2, i think u secured 90+
  16. I

    Math P62

    I don't remember using critical values. Have u used them?
  17. I

    Need a help on predicting my Alevel grades.

    @hassam what do u mean by 93-94? UMS? No doubt u'll get an A but UMS 93-94 might be quite difficult.
  18. I

    Need a help on predicting my Alevel grades.

    this is getting stupid. Or are u intentionally acting dumb? Look at last years' gt and decide by yourself. Nobody here is really interested in what grades u'd get
  19. I

    Math P62

    gt for this year won't be above 40, dumbs.
  20. I

    Chemistry MCQ thread...

    Can anyone answer this?
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