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Search results
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Mathematics: Post your doubts here!
1/(sin^2A - cos^2A) = 3 1 = 3sin^2A - 3cos^2A sin^2A + cos^2A = 3 sin^2A - 3cos^2A 4cos^2A = 2sin^A tan^2A = 2 Solve for A. Remember to get both, the + and the - values. Let me know if this doesn't make sense to you. -
School uniform or normal clothes?
No staplers or paperclips. You can't bring them and they won't give you those. Not that I can remember of. The only exam I gave that required extra sheets was 3 years ago and I don't remember how the pages were tagged when I handed it back. I think you have to tie them with a thread and they...- AbbbbY
- Post #20
- Forum: O-Levels / GCSEs / IGCSE
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School uniform or normal clothes?
They can't kick you out even if you're the only one not wearing uniform.- AbbbbY
- Post #15
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry: Post your doubts here!
Oh this question has given me a lot of trouble lately. I went with (21/1)*(1/9) = 21/9 = 7/3 My explanation was something like 21/1 = ratio of rate of tertiary to primary H. 1/9 = ratio of tertiary to primary H present. Ratio of J/K = 21/1 * 1/9 = 21/9 = 7/3 J= Tertiary Hydrogen replaced... -
School uniform or normal clothes?
So what if they don't. It's not like you've to go to your school to give the exam. Unless, you're like me and have your institution as your center -_-- AbbbbY
- Post #12
- Forum: O-Levels / GCSEs / IGCSE
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School uniform or normal clothes?
Invigilators can't let you not sit for the exam. Shorts or jeans, t shirts or shirts, uniforms or nightsuits. It's not in their power to not let you sit for an exam because they don't like what you're wearing. Unless, of course, someone goes to give an exam nude. That's a different story.- AbbbbY
- Post #11
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry: Post your doubts here!
Firstly that is a very, very crude and rudimentary method to define acids and bases. Secondly, ionic BEHAVIOR isn't the same as ionic-compound. Lets say someone is a man and behaves like a woman. He wont be a woman. Just a man who behaves like one. Get it? Likewise, due to the H-Cl polarity... -
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School uniform or normal clothes?
Not really. Private or not, it doesn't matter. Exactly. Comfort first so that you're in the ideal environment to give an exam in.- AbbbbY
- Post #7
- Forum: O-Levels / GCSEs / IGCSE
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School uniform or normal clothes?
It really doesn't matter. It depends on your school/college. My center is and has been my institution always so we are compelled to wear the uniform during exam. (Exam or not, no student enrolled can enter the premises without uniform here) However, normal clothes wouldn't matter in external...- AbbbbY
- Post #2
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry: Post your doubts here!
HCl IONIC!???! Good Lord! 2 days to p2 mate! HCl isn't ionic, it's covalent. Cl has 7 outer electrons, H has a single electron. How can they ever be ionic. It shows ionic character in water because it's polar-covalent. HCl + H2O -> H3O+ + Cl- [thus an acid.] -
Chemistry: Post your doubts here!
It's a 3D structure so really, it makes no difference. -
Chemistry: Post your doubts here!
I'd write Carbonyl not present OR Aldehyde/Ketone not present. Just writing ketone not present doesn't say whether if aldehyde is present or not and since it's DNPH if it's negative, there's no way either is present so go with carbonyl. -
Chemistry: Post your doubts here!
i - C8H18 + 12.5 O2 -> 8CO2 + 9H2O (Be warned, decimals are not acceptable in equations in exams. either fractions, or whole numbers) ii - 24.6 mol. (I've cut out the working to keep it short) iii- Look. You need the mass of CO2. Instead of finding moles of CO2 from that ratio, just work with... -
Chemistry: Post your doubts here!
Rotation about the C-C bond wants you to apply the fixed pi bond vs free rotation logic. Since there are no pi bonds in the straight alkane chain, it says that one way or the other, you can rotate the carbons to lie in the same plane. In layman terms, with a branched alkane, how on earth can you... -
Chemistry: Post your doubts here!
Lol. Where did I say you did that to get praises etc :fp1: It's a help thread, and I pity people who answer to get praises, really. I'm just saying, going thru the post, I was like, woahh. That sounds sooo much like the way I write, bolding out here are there and the general tone. Then I... -
Chemistry: Post your doubts here!
Umm the stuff behind the arrow is also acceptable, and in fact it is recommended that it be used because it shows the placement of the Nitro groups (i.e 2,4) -
Chemistry: Post your doubts here!
Sorry for the crappy drawings. In my defence, drawing has never been my strength :p -
Chemistry: Post your doubts here!
Been asked here the 8th time in 3 weeks and counting! Nice copy-pasta. I wonder why the writing style sounds eerily familiar. Oh rightt.. -.-