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A level Biology: Post your doubts here!
can anyone please explain this? how changing gases can affect diffusion or active transport rate? -
Chemistry: Post your doubts here!
how is the ester propyl methanoate? -
The hardest truth about life is that no one cares!! people are just...curious
The hardest truth about life is that no one cares!! people are just...curious- Eugene99
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Chemistry: Post your doubts here!
hydrolysis of ethyl propanoate will give CH3CH2OH, Mr=46 and CH3CH2COOH, Mr=74 percentage of OH, therefore will be 46/120 x100 =38.3% and for the acid, 74/120 x 100=61.7% but the answer isn't B, it's A!! What went wrong now?? :3 -
Chemistry: Post your doubts here!
qwertypoiu that post#9221, the guy also answered q18 but he said HCl will not react KI, but I would say KCl and HI will form, won't they? this is the question paper: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_11.pdf it's 18th one -
Chemistry: Post your doubts here!
https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-462#post-812038 found another solution, post#9221 here ...used trial and error -
Need bundles of prayers!! A'Levels are harder than anything!!!
Need bundles of prayers!! A'Levels are harder than anything!!!- Eugene99
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Chemistry: Post your doubts here!
oh yes yes, Tollen's is a test for aldehydes! not for carbonyls! thanks can u help with my other questions? -
Chemistry: Post your doubts here!
It's D. I thought A since Florine is the most reactive element, the C-F bond is strongest and most difficult to break, but it's D. How and why will it produce precipitate quickest? -
Chemistry: Post your doubts here!
Why is it X and Z only? when the OH in W can be oxidized to COOH and the carbonyl group, in the middle, will test positive with Tollen's! -
Chemistry: Post your doubts here!
Moles of R at equilibrium are x, so P will have 2+x-x =2 what about Q? (Ans B) -
A level Biology: Post your doubts here!
oops!! :p thanks anyway -
A level Biology: Post your doubts here!
Why is this C? I solved like this: 40 div->>0.1 mm 1 div ->>0.1/40 mm 80 divisions--0.1/40 x 80 =0.2 mm 0.2x1000 = 200 micrometers What did I do wrong? -
Chemistry: Post your doubts here!
When you read the full question, you'd know. It's winter 11, 9701/22. They reacted K2CO3 and KHCO3 in two seperate experiments to determine the enthalpy change for the thermal decomposition of KHCO3...We could take any steps in order to reach it, as the overall energy change is independent of... -
Haqiqat Khurafat Mein Kho Gyi... Ye Ummat Rawayat Mein Kho Gyi #Iqbal
Haqiqat Khurafat Mein Kho Gyi... Ye Ummat Rawayat Mein Kho Gyi #Iqbal- Eugene99
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