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  1. aalmuhannadi

    Physics: Post your doubts here!

    I've attached the questions: The question is c)ii, the mark scheme says that the wave is reflected off of other surfaces, which I understand, but it also says that the path difference decreases and that the amplitude decreases which I don't get. What do they mean by a decreasing path difference...
  2. aalmuhannadi

    Chemistry: Post your doubts here!

    Yeah I figured out how to draw it now but how would you tell from its structural formula that it was an ester though? I'm not aware of how it's formed and I don't think you need to know that from the syllabus...
  3. aalmuhannadi

    Chemistry: Post your doubts here!

    How do you figure it's an ester? isn't the middle carbon bonded to the left-hand carbon, which has a double bond with oxygen and -OH?
  4. aalmuhannadi

    Chemistry: Post your doubts here!

    In this question, I know the answer is D but why is C wrong? It does have a chiral centre as well as a carboxylic acid group, so it's both chiral and acidic...
  5. aalmuhannadi

    Chemistry: Post your doubts here!

    Thanks for the explanation, the answer was actually A after I did it again, I misread the mark scheme! Thank you so much for explaining it though, really helped.
  6. aalmuhannadi

    Chemistry: Post your doubts here!

    In this question, I'm unsure of the products of each reaction as in the book it only details about when you have only one halogen attached to an alkene/alkane... What kind of reaction will happen with each answer? THis confused me because for example with NaOH, I'm not sure which of the carbon...
  7. aalmuhannadi

    Physics: Post your doubts here!

    Do you mean that in D, the current would be blocked except when the emf is high enough, at THAT point the current will start passing and the reading on the voltmeter will give the initial voltage which we're looking for? Whereas in A the current will keep passing anyway because of the position...
  8. aalmuhannadi

    Physics: Post your doubts here!

    I don't understand, what do you mean by 'if it's working then it would record the voltage of the passing of current...'? Can you explain further please?
  9. aalmuhannadi

    Physics: Post your doubts here!

    In this question, logically the answer I think (and also my teacher said this) that it would be A because the cell needs to be varied (in order to increase voltage, current and thus allow the diode to conduct) so B and C are wrong. Then it has to be A because D isn't forward-biased i.e. current...
  10. aalmuhannadi

    What is the hardest subject in A-Level

    Has to be maths for me, especially mechanics!
  11. aalmuhannadi

    Physics: Post your doubts here!

    This is an Edexcel question that I'm having trouble with. I'll write my answer and can someone please point out what's wrong with it (4 marks): Newton's first law states than an object would continue with constant velocity or remain stationary if there;s no resultant force. When the train...
  12. aalmuhannadi

    Chemistry: Post your doubts here!

    I just balanced it wrong, should've been 3N2 instead of 9, then it works
  13. aalmuhannadi

    Chemistry: Post your doubts here!

    scouserlfc solved q14 :D
  14. aalmuhannadi

    Chemistry: Post your doubts here!

    So all that's left now is explaining why HCl and KI don't react
  15. aalmuhannadi

    Chemistry: Post your doubts here!

    No because there's something wrong with the reaction I wrote, something stoichiometric or I got some of the products/reactants wrong...
  16. aalmuhannadi

    Chemistry: Post your doubts here!

    Summer 2012 paper 11, for q18 I thought the same thing but the answer is C apprently and in the exmainer report it says: "The relevant product of the first reaction is HCl. HCl will not react with KI(aq), so observation X is 'colourless solution'. The second reaction was between KCl and AgNO3 in...
  17. aalmuhannadi

    Chemistry: Post your doubts here!

    In Q18 here, the examiner report says that after observation X, HCl is made, but then it says that HCl will not react with KI? I thought that it would indeed react as Cl would displace I and therefore no reaction = colourless solution? Or is there something I'm missing... In Q14, I'd just like...
  18. aalmuhannadi

    Chemistry: Post your doubts here!

    For q11 do you at least know what chapter this question could be from? like which topic?
  19. aalmuhannadi

    Chemistry: Post your doubts here!

    Oh I figured it out now but I believe your explanation is wrong? How can you have a negative hydrogen ion? If it was a negative S ion then S would bond in a single bond with H and still have 3 lone pairs (due to the extra electron gained) is that not right?
  20. aalmuhannadi

    Chemistry: Post your doubts here!

    Here in Q11, I don't get why the answer is A, what's the effect of acidifying on this in chemical terms? and in Q33, I know 1 is correct but for 2, when i drew the ion i had a double bond between H and S so S had only 2 lone pairs, what's incorrect here?
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