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Chemistry: Post your doubts here!
1 c: i- O2 ii- CO2 iii- 40-30 = 10 iv- 50-30 = 20 Explanations: You gotta realize whats going on. HC is mixed with Oxygen and burnt. CO2 is produced but some unreacted O2 is also present. So, the gas mixture is CO2+O2 This CO2+O2 mixture is then reacted with KOH. The KOH reacts with the CO2... -
Chemistry: Post your doubts here!
Mg isn't yellow! THat's a criminal mistake! Have you guys seriously never thrown magnesium salts on the burners during your practicals? I guess my batch was the only one full of devils. Magnesium burns with a very bright while flame. Sodium burns with a yellow flame. Oh also. Try Barium some... -
Chemistry: Post your doubts here!
Oh sorry. Missed those. 8: D Easiest question to confuse kids. It's basically a Hess' Law question borrowing concepts from Born-Haber cycles. Can be solved in a heart beat if you're going the AS+A2 way. Can be solved in two heart beats if you're not. Your hess' cycle will look something like... -
Chemistry: Post your doubts here!
20: None that I know of. There's 2^n for cis-trans tho. 24: Just draw out the ester. CH3C(Br)(CH2Br)COOC(CH3)2(CO2H) B cannot be because it's showing the two Carboxylic terminals linking up. That can't happen. 25: It's 2,4 DNPH reacting with a carbonyl, so it's addition elimination 30... -
Chemistry: Post your doubts here!
Kc = [Pesticide in Hexene]/[Pesticide in water] Assuming X dissolves in hexene, 8 = x/0.005-x Solving for x you get 0.00444g (shorter method used bec 2 marks only + same volumes) -
Chemistry: Post your doubts here!
Simple! It's pretty much an AS question. E is a di-ol. Just add 2 OH's across the double bond. ii) Reaction I: Cold + dilute KMnO4 Reaction II: K2Cr2O7 + H+ + warm __ Incase you don't get whats going on, the cold KMnO4 will add a di-ol across the double bond. Cr2O72- + heat oxidises... -
Chemistry: Post your doubts here!
1b: If I'm not mistaken, Ethanal: A Ethanol: C Methoxymethane: A 2-methylpropane: B Not sure though. If I'm wrong, do let me know. 1d: I'd probably go along the lines of Hydrogen bonding. I'd write that ethoxyethane cannot form hydrogen bonds with water so two insoluble layers are formed... -
Chemistry: Post your doubts here!
CH3(CH2)7CHO OHC(CH2)7CX All you have to do is split the double bond and partially oxidise it i.e keep the end point as the Aldehyde. -
Chemistry: Post your doubts here!
All of the HCl will react with the NaOH. So, mols of HCl present = mols of NaOH used = 0.005 -
Hard lamination on O level certificates
They don't, usually, ever, but I'm no authority on this and may be wrong. -
Hard lamination on O level certificates
No, they wont. Your best bet it going to a photocopier, explaining to him the importance of the issue and asking him to remove it carefully such that it doesn't damage the certificate. -
Firstly. Just because I gave it unprepped doesnt mean anyone else should. I know you'll be...
Firstly. Just because I gave it unprepped doesnt mean anyone else should. I know you'll be preparing but don't let my example demotivated you. The black sheep in the herd. Secondly, I reckon skimming thru the book and doing a few papers should be enough. 10 days is a loooooong time and you can...- AbbbbY
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Oh also. Your performance on the day of the exam matters a lot. Math p1 on any other day and I'd...
Oh also. Your performance on the day of the exam matters a lot. Math p1 on any other day and I'd have gone for the 100%. Made a stupid mistake on exam day. So yeah. I was very well rested so mentally was very alert and knew how to improvise.- AbbbbY
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Several factors. - High general knowledge. - Had a lot of subjects so a large portion of the...
Several factors. - High general knowledge. - Had a lot of subjects so a large portion of the syllabi overlapped - Biology. P2 is literally 70% Bio P6 Remember, you don't have to know everything and be the best. Just better than the rest. That's it.- AbbbbY
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No ones ever that lucky. If I sit again for it today I'm pretty sure I could nick an A on the...
No ones ever that lucky. If I sit again for it today I'm pretty sure I could nick an A on the minimum- AbbbbY
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Maths, Addmaths and Statistics: Post your doubts here!
Barely ever. I don't. :p- AbbbbY
- Post #7,081
- Forum: O-Levels / GCSEs / IGCSE
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Read 2 marking schemes before the exam. Look. I had 10 exams in a week prior to the 2 EM...
Read 2 marking schemes before the exam. Look. I had 10 exams in a week prior to the 2 EM papers back to back and was totally exhausted so I stopped caring for EM and just slept all day- AbbbbY
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Maths, Addmaths and Statistics: Post your doubts here!
Funny? I'm not joking. Questions like this don't show up in exam. They're tested extensively on the SAT circuit though. And book? Idk. Never used a book- AbbbbY
- Post #7,076
- Forum: O-Levels / GCSEs / IGCSE
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No I slept for 13 hours before the exam. Didn't read the book. :p Skimmed thru a few pages 30...
No I slept for 13 hours before the exam. Didn't read the book. :p Skimmed thru a few pages 30 mins before the exam.- AbbbbY
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