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Chemistry: Post your doubts here!
Ionic bond between ions of NH4+ and SO42- -
Chemistry: Post your doubts here!
Because the difference between the original structure and final structure is 10H. So we conclude 10H was added (5 C=C bonds affected). -
Chemistry: Post your doubts here!
You can try viewing it in this manner. A<-->B During equilibrium, the rate of forward reaction = rate of backward reaction. When B is removed, we understand that the equilibrium will shift right. This does not necessary mean that rate of forward reaction is increased. It is actually rate of... -
Chemistry: Post your doubts here!
s04p1 Regarding Q28. Key phrase in the question is "excess NaOH was used" NaOH + SO3 --> NaHSO3 ---(1) As there is excess NaOH, the HSO3- (acid) will further react. NaHSO3+ NaOH --> Na2SO4 + H2O --(2) Combine eqn (1) and (2), you will have the overall equation. 2NaOH + SO3 -->Na2SO4 + H2O... -
YouTube Videos on Past Year Chemistry MCQs
Ok, will consider that. Thanks for the feedback. -
YouTube Videos on Past Year Chemistry MCQs
June 2013 Paper 1_2 is uploaded http://www.youtube.com/playlist?list=PL4Jmce8VJnNWSchiyYdNNlLsHJlIvfZ35 -
Chemistry: Post your doubts here!
Video for June 2013 Paper1_2 is uploaded http://www.youtube.com/playlist?list=PL4Jmce8VJnNWSchiyYdNNlLsHJlIvfZ35 -
Chemistry: Post your doubts here!
Expt 1: moles of H2O2 = original conc x original vol = 0.23 x 0.05 =0.0115 mol conc of H2O2 at start of experiment 1 = moles of H2O2/volume of solution = 0.0115/0.130 = 0.0885 mol dm-3 -
Chemistry: Post your doubts here!
You can check out post #9267 on page 464 -
Chemistry: Post your doubts here!
Some years have 3 mcqs, so it depends on the years. I'm working on the 2013 June papers first, then the 2013 Nov papers. 2013 June Paper 12 should be ready (if no uploading issues) by this evening. -
Chemistry: Post your doubts here!
hmm..this is a bit contradicting, how can it both be tetrahedral and have 180 at the same time? Carbons in a row doesn't mean 180 degrees.. -
Chemistry: Post your doubts here!
w13qp11 4 atoms of H are removed (from 3 COOH and 1 OH). 4H --> 2H2 ( 2 moles of H2 gases) -
Chemistry: Post your doubts here!
w11qp12 Q3. Cl- : 1s2 2s2 2p6 3s2 3p6 F- : 1s2 2s2 2p6 K+ : 1s2 2s2 2p6 3s2 3p6 Na+ : 1s2 2s2 2p6 We need to focus on F- and Na+ as the electrons removed are from a shell nearer to the nucleus. Between F- and Na+, Na+ has more protons, so will hold on to its electrons more tightly. Q26... -
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Chemistry: Post your doubts here!
w13qp12 Do try to include the answers next to your selected questions, it would make it easier for us to reply. :) Q8. To find the "heaviest atmosphere", we can use the weighted average of the Mr. Using option D as example. Weighted Mr of D = 0.825 x Mr of H2 + 0.152 x Mr of He + 0.023 x Mr... -
Chemistry: Post your doubts here!
The "crossing of charges method" does give us the correct answer in this case, so if all else fails, I guess we can use it. However, lets see if we can make us of the other information given. Understand that whatever moles of C we have at the beginning will eventually be the same number of... -
Hi there. Sorry. I'm chemistry trained. So what I have is just limited to chemistry.
Hi there. Sorry. I'm chemistry trained. So what I have is just limited to chemistry.- Metanoia
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YouTube Videos on Past Year Chemistry MCQs
Most recent papers on top. 9701 Nov 2013 P11 (Uploaded on 5 June) http://www.youtube.com/playlist?list=PL4Jmce8VJnNU4YaGfNrPYv7SBJXnB1IAC 9701 June 2013 P11. (Uploaded on 31 May) http://www.youtube.com/playlist?list=PL4Jmce8VJnNXQDPOYEr7j99fO9nIy55eh 9701 June 2013 P12 (Uploaded on 1 June)... -
YouTube Videos on Past Year Chemistry MCQs
Having just joined the forum not too long ago,I realised that past year MCQs have given problems to students as unlike other components, the MCQs do not come with explanations. I intend to try out a little project where I would go through selected MCQ (chemistry) papers on YouTube. Why this... -
Chemistry: Post your doubts here!
Hi all, in view of the lack of solutions for past year MCQ papers, I've attempted to create a youtube playlist to explain the answers. It is a long and laborious process, it is not possible for me to cover a large number of practice papers before your exams on 10 June, I view it as more of a...