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Search results

  1. aalmuhannadi

    Chemistry: Post your doubts here!

    Uploaded 3 more questions. In the first question, how do you deduce whether or not the reaction is endothermic or exothermic? In Q11, how do you recognise that the ions act as catalysts? Q16: how are the volumes achieved? I know how to get the molar quantities of Cl2 and H2 from their ionic...
  2. aalmuhannadi

    Chemistry: Post your doubts here!

    And in this question, the answer is somehow D.. I know that NaI reacts with hot H2SO4 to give HI, I, H2O and H2S, so shouldn't they also be the products for the reactions between, say NaAs with H2SO4 but with As instead of I?
  3. aalmuhannadi

    Chemistry: Post your doubts here!

    Can someone please just check if my explanation behind this is correct or not? The answer is D because conc. H2SO4 isn't a strong enough oxidising agent to oxidise chlorine ions, which is why the gas made is colourless HCl. However, Iodine is a weak reducing agent due to its position in the...
  4. aalmuhannadi

    Chemistry: Post your doubts here!

    Oh I thought that H was also bonded with O in B, but we didn't cover any organic chemistry in school yet so I guess that's why I got it wrong, many thanks!
  5. aalmuhannadi

    Chemistry: Post your doubts here!

    Alright I understood the first one, the second one the answer is A but I'm confused as to why you can't also have hydrogen bonding with B. I know C and D are wrong.
  6. aalmuhannadi

    Chemistry: Post your doubts here!

  7. aalmuhannadi

    Chemistry: Post your doubts here!

    Would someone mind explaining why the answer for this is C?
  8. aalmuhannadi

    haha i meant in real life not online

    haha i meant in real life not online
  9. aalmuhannadi

    Yeah :) I play almost every week with friends

    Yeah :) I play almost every week with friends
  10. aalmuhannadi

    إن لله وإن إليه راجعون، ولا حول ولاقوة إلا بالله العلي العظيم

    إن لله وإن إليه راجعون، ولا حول ولاقوة إلا بالله العلي العظيم
  11. aalmuhannadi

    Chemistry: Post your doubts here!

    Wow never knew you could do it that way! I'm used to using Hess's law but I didn't know how to do that for this question. I wish you could be my tutor!!
  12. aalmuhannadi

    Chemistry: Post your doubts here!

    Oh alright, thanks. Well I stumbled onto an enthalpy change question which I couldn't do because Hf and Hc weren't labelled so it confused me, could you possible help do this one as well?
  13. aalmuhannadi

    Chemistry: Post your doubts here!

    Alright thanks, and Q17 was from 2005
  14. aalmuhannadi

    Chemistry: Post your doubts here!

    But Q17 was part of the same paper, it was a paper 1 question... and I found a similar question about complex ions in the summer 2012 paper 1 as well! For Q16 you're right it's C. The question says that for all of them when heated a colourless gas was evolved, so how does barium carbonate not...
  15. aalmuhannadi

    Chemistry: Post your doubts here!

    Need help with these questions as well Q16 + 17 I do not understand at all... and aren't 'ligands' part of the A2 syllabus? That's what my teacher said Q33 How would you deduce that it had an empirical formula of BN?
  16. aalmuhannadi

    Chemistry: Post your doubts here!

    minato112 scouserlfc Thanks you two your answers really helped much appreciated!
  17. aalmuhannadi

    Chemistry: Post your doubts here!

    I uploaded two questions, need help with the answers please! Answers: 13: B and 33: 1 and 2, but can someone please explain them? For 13, I did not find anything on chemguide or the coursebook about diagonal relationships so I'm not sure if it's in the new syllabus (because these are from the...
  18. aalmuhannadi

    Chemistry: Post your doubts here!

    Thanks now that explains it!
  19. aalmuhannadi

    Chemistry: Post your doubts here!

    Summer 2012, Variant 21, paper 1, Q34
  20. aalmuhannadi

    Chemistry: Post your doubts here!

    Yes I've studied the Bronsted-Lowry theory and if something donates a proton/H+ ion it's an acid not a base! Check for yourself xD And where in the syllabus do you find that the product has a coordinate bond? That's the thing that's troubling me I have no idea how/where the co-ordinate bond is...
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