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Chemistry: Post your doubts here!
Oh, I have left out the other part of the information. There is indeed a chiral carbon in Option D, but option D is a "Cis" isomer (check the C=C). Option C is a trans-isomer. The question is looking for an optically active trans-isomer -
Chemistry: Post your doubts here!
That would create an identical structure as the 2nd structure (imagine rotating the 2nd structure 120 degrees counter-clockwise). -
Chemistry: Post your doubts here!
S16qp12 Q21 Focus on the groups at the C=C bond, notice that the groups diagonally opposite each other are different for the two molecules (geometric isomers) Q37 Sodium will also react with the hydroxyl OH group, so option 1 is out -
Chemistry: Post your doubts here!
Q26 is the same as variant 13, which was explained. Q30 Chiral carbon is marked in red -
Chemistry: Post your doubts here!
I'm not sure why I am unable to attach diagrams at this moment.. Q11 Answer: C A reaction with autocatalysts will start off relatively slow.The rate of reaction will increase due to the production of catalysts. After a peak, the rate of reaction will decrease when the concentration of reactants... -
Chemistry: Post your doubts here!
I can't seem to access the papers. Are you able to post images of the questions directly here? EDIT: Ok wait, I think I've got it, give me a while to look through them. For me to work faster, do you have their respective answers? -
Chemistry: Post your doubts here!
Bond dissociation energy is a measurement of the strength of the covalent bond holding the atoms together within the molecules, and not the measurement of the strength of the bond among molecules. -
Chemistry: Post your doubts here!
Use this forum to clarify your doubts on past year papers. An exam is but an academic indicator, please do not compromise the bigger test which is your integrity. It is unfair to all other students giving their honest efforts. -
Chemistry: Post your doubts here!
Acids can be viewed as proton donors, for options A, B and D, the underlined substances are acids as they donated (lost their protons) Option B, on the other hand, lost OH-. -
Chemistry: Post your doubts here!
Hopefully, the explanation in this video would help -
Chemistry: Post your doubts here!
If it is unused, there is no need to wash it. If used, definitely wash it with distilled water. Unlike what some students think, there is no need to dry the flasks though. -
Chemistry: Post your doubts here!
Converting mmol/l to mg/dl First, focus on changing mmol to mg mass (milligrams) = millimoles x Mr = 18.5 x 180 = 3330 mg Next, change l to dl 1 l = 10 dl Therefore 18.5mmol/l = 3330 mg/ 10 dl = 333 mg/dl -
Chemistry: Post your doubts here!
A thistle funnel can be used -
Chemistry: Post your doubts here!
Check the information under "PART A) METHOD" FB3 (diluted HCl) is prepared from diluting FB2 (concentrated HCl) concentration of FB3 = (10 x 2)/250 = 0.08 mol/dm^3 -
Chemistry: Post your doubts here!
Perhaps you can list down the other option(s) you thought were also correct, then we can guide you accordingly. We can try replacing option A (correct answer) with something familiar CH4 (g) --> C (g) + 4 H (g) ∆H Bond energy of C-H is ∆H/4 1/4 CH4 (g) --> 1/4C (g) + H (g) H4 (g) --> C... -
Hi there, sorry for the late reply. Thanks for your support. I'm based in Singapore.
Hi there, sorry for the late reply. Thanks for your support. I'm based in Singapore.- Metanoia
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Chemistry: Post your doubts here!
I'm assuming that your Ksp refers to the Ksp of Mg(OH)2. -
Chemistry: Post your doubts here!
Click on the heading of the video, it would direct you to youtube and you can look at the other videos.