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  1. aalmuhannadi

    Physics Unit 2. How was it ???!!!

    No I think they're assuming that the only right answer is the simpler answer of it being a series circuit so I think we're gonna lose all the marks for that question, no ecf, except for those easy 1 or 2 mark calculations that were at the end sadly :(
  2. aalmuhannadi

    Physics Unit 2. How was it ???!!!

    For me yes it was corroded because the distance was 1.5cm instead of 4cm... let's hope I got that right at least :D
  3. aalmuhannadi

    Physics Unit 2. How was it ???!!!

    It was mostly easy for me except for the last question where I assumed that when one bulb was removed, the place where it was removed is still connected so I made the current in parallel and my argument was that in parallel resistance is less so each bulb gets enough current to operate whereas...
  4. aalmuhannadi

    Calling out all the Gamers! Need your opinion/advice

    Had a US xbox, plugged it into the power outlet without the p.d. transformer and it literally exploded on me... To be fair though I just don't like xbox because you need to continuously pay to play online, but I think its controller is way better than PS3. Games are almost similar except for a...
  5. aalmuhannadi

    What do you think will come up in Chemistry 32? :)

    Oh wow thank god! You just saved me a week long of regret my friend haha I thought it was the enthalpy of FORMATION xD that's why I found such a high value on wikipedia D: many thanks :)
  6. aalmuhannadi

    What do you think will come up in Chemistry 32? :)

    You can check on Wikipedia it's aroun 900-1000 kj and it's positive not negative
  7. aalmuhannadi

    What do you think will come up in Chemistry 32? :)

    I used E=mct using the both temperatures the student got and another one with the mean temperature, and explained that it's justified because the result is more accurate as it is an average of the two heat changes (and also the enthalpy change would be an average)
  8. aalmuhannadi

    What do you think will come up in Chemistry 32? :)

    Same I got -70 something kJ >.> it's wrong I checked the value of formation of the compound on wikipedia...
  9. aalmuhannadi

    What do you think will come up in Chemistry 32? :)

    How was it for you guys? Mine was okay not too great, I got for the anion/cations manganese chloride, iron 3 nitrate and zinc sulfate. And for the last two tests the H+ for me was in FB4 and FB6 using the chromate ions and magnesium ribbon with the lighted splint (although i barely got small...
  10. aalmuhannadi

    Physics unit 1 6PH01 discussion :)

    Everyone at my school thought it was relatively hard compared to the last few papers, I messed up bad in the accelerometer question (couldn't prove the acceleration) and the suggestions following it, like why it couldn't be horizontal or why phones have 3 at right angles to each other. That was...
  11. aalmuhannadi

    Hardest Chemistry MCQs ever.

    No because if there are twice as many metal ions, then if the 2 electrons lost from the sulfite are transferred to the metal ions, each metal ion would only gain 1 electron (since there are two of the metal ions), and hence the oxidation number of each metal ion decreases by one
  12. aalmuhannadi

    Hardest Chemistry MCQs ever.

    No problem happy to help :) yeah I didn't get it from the cambridge coursebook I study from the revision guide and from my own notes taken from the chemguide website, so that's where you could find the acidification part hopefully mentioned
  13. aalmuhannadi

    Chemistry: Post your doubts here!

    I think the reason is that, firstly, yes the only types of electrophilic reactions (as far as I know) are addition and substitution. Secondly, I'll write an example of an elimination reaction with an alcohol: CH3CH2CH2OH > CH3CH=CH2 + H2O , I took this from a book and clearly the concentrated...
  14. aalmuhannadi

    Hardest Chemistry MCQs ever.

    Yes in q18 the answer is C you're right, I was explaining how C is the only one where the lone pair isn't used. In q39, the replacement of Na+ with H+ isn't really a reaction, it's just a step in the process of isolating the carboxylic acid if a base is used to convert ester > acid + alcohol or...
  15. aalmuhannadi

    Hardest Chemistry MCQs ever.

    q39: just a matter of recalling the organic reactions: CH3CH2Cl + NaOH (dilute) >>> CH3CH2OH + NaCl - no ethanoic acid made CH3CO2CH3 + NaOH (dilute) >>> CH3CO2Na + CH3OH >>> after distilling off the alcohol, 'acidification' > add dilute HCl and the carboxylic acid is formed (CH3CO2H -...
  16. aalmuhannadi

    Hardest Chemistry MCQs ever.

    q18: A is wrong because CH3 is bonded to NH3 (let's ignore the iodine for now as it is not directly bonded to this since it's an ionic compound). Nitrogen has 5 valence outer-shell electrons as it is in group V. 3 of those electrons are used to bond with the 3 hydrogens, the 4th one is used to...
  17. aalmuhannadi

    Chemistry: Post your doubts here!

    I think it's D because NaOH is the strongest base out of the 4 given and so will be more strongly ionised in solution (equilibrium of ion dissociation is more likely to be to the right side rather than left) and so it would give a more accurate end-point than the rest, not sure if my reasoning...
  18. aalmuhannadi

    Chemistry: Post your doubts here!

    Hahahaha it's cool believe it or not I missed it the first time I did this paper too until my teacher pointed it out!
  19. aalmuhannadi

    Chemistry: Post your doubts here!

    Reaction 1 is labelled as going from compound W to compound U. Another way of going to compound U is from T (Barium hydroxide) by adding sulfuric acid, and they are asking what can you use instead of the sulfuric acid? Well from this path you'd know that compound U is barium sulfate because...
  20. aalmuhannadi

    Chemistry: Post your doubts here!

    Dehydration reactions aren't electrophilic, they're elimination reactions, and, like with hydration, have their own mechanisms separate from electrophilic reactions
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