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Biology; Chemistry; Physics: Post your doubts here!
Hydrogen Carbonate, from what I recall, is used in the Bio questions involving respiration/photosynthesis where you have to see if CO2 is being produced or used. Nothing more. You're not supposed to know the equations AFAIK. If it's a particular question that you've seen in a past paper, please...- AbbbbY
- Post #12,980
- Forum: O-Levels / GCSEs / IGCSE
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Maths, Addmaths and Statistics: Post your doubts here!
Questions like these don't show up in O Level Math. They're more of a SAT Reasoning thing.- AbbbbY
- Post #7,073
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry: Post your doubts here!
Is this crazy co-incidence or what? I was hoping it'd be this question haha. 5b) C4H8O2. HCO2CH2CH2CH3 CH3CO2CH2CH3 CH3CH2CO2CH3 HCO2CH(CH3)2 Ofcourse, now any of them can be W X Y and Z. c(i): Carbonyl group (ii): Ketone is present (iii) Reverse solve this question. Look. Since part... -
Football/Soccer anyone?
So this settles it. The title's going to Anfield. :'( What a twist to the EPL race btw. What began as a 'Can United defend their title' to a Arsenal lead atop, then with Chelsea and City joining the race, Liverpool playing for the 4th place back then. Chelsea, Arsenal and City each with... -
Chemistry: Post your doubts here!
Okay I'll do it again and this time in full: Finding order wrt CH3CHO Considering experiments 1 and 2, if 0.25/0.2 = 1.25/1.0 then it's order 1. So, order 1. Like wise, wrt CH3OH, seeing exp 2 and 3, 0.16/0.10 = 2/1.25 so order 1. wrt to H+ is tricky because all experiments have varying... -
Chemistry: Post your doubts here!
Dude. Read under the figure in the mark scheme. "(allow the 2-, 3- or 4- isomer) [6]" The figure they've shown is for examiners, not students. This is what the CIE maintains in each of their teacher-examiner meetings. The line shown is just a representative of Cl being on 2 3 or 4. -
Chemistry: Post your doubts here!
Look, seeing 1 & 2, we know that the CH3CHO is order 1 There are two ways to do this. Both are the same. You can either make CH3CHO 0.25 or make CH3OH 0.10 You need a changing H+ conc but constant conc's for the other two. Lets suppose you don't have that. You can find that the orders of... -
Chemistry: Post your doubts here!
Could you link me to the paper or send me pics of the entire question? If a new concept is tested, it's done by exemplifying a reaction and the question follows the example. I've looked in all 3 variants twice but couldn't find the question. -
Guide and Tips-O Levels
If you're talkng about the OP, the notes mentioned there are actually my notes. However, since I wrote them like 3-4 years ago with an ink pen, they're all faded now and illegible so I can't share a copy of them. I'll try and find if any of the kids I passed them on to have the legible...- AbbbbY
- Post #167
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry: Post your doubts here!
:o Never seen anything like this before. Where did you find this? -
Chemistry: Post your doubts here!
so do we always take the compound to be an alkane and then calculate from there? and can you please tell me how there are 5 C=C bonds? ^_^ I can count only 4 Umm I'm not sure but that's the easiest way, if not the only covered by A Level syllabus. __ How can you count just 4? I just made... -
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Chemistry: Post your doubts here!
Each 'fragment' in this example comprises of 3 'residues'. Makes sense now? -
Chemistry: Post your doubts here!
Umm, you do realize you've answered 24 here, right? :p quote="Suchal Riaz, post: 745892, member: 15977"]there are two c=c so two moles of Br2 are required to react completely. and (separately) 2 mol of h2 are required. A! This is a pretty simple question which idk why a lot of students have... -
Chemistry: Post your doubts here!
Aaah. Just did this 5 mins ago :D Okay so basically, first things first, you gotta realize that 3 water molecules will be lost, so the Mr of the fragment[gly-ala-ser since equal amounts] will become (75+89+105-(18*3)) = 215. Dividing 600,000 by 215 will give you the number of fragments... -
Football/Soccer anyone?
Hurtful, it may be, just what I feel. Indeed. Like I said, no one has deserved it more than that one man (with Liverpool). Regardless, as a United fan, hurts to see him win it. Though, even then, I can't but respect the man for clinging onto Liverpool during their tough times and for a long... -
Football/Soccer anyone?
Oh and what drama at the Etihad!! Fernandinho scores at the 1st minute, Wickham equalizes at 73', City go all in bring everyone forward attack after attack. 83', Sunderland find a quick counter and Wickham takes the lead. Dying minutes of the 90, Nasri takes a poor shot at Mannone. It hits him... -
Football/Soccer anyone?
BTW, two other mega results today. City 2 - 2 Sunderland and Everton 2 - 3 Palace. Title race is effectively over for City now, IMO. It's all Liverpool vs Chelsea. Chelseas only shot is winning it at Anfield, which is near impossible. Liverpool need to score one quick and defend like them... -
Football/Soccer anyone?
Hahahhaha. Yeah I saw that too. I'm like, wtf you do realize it wasn't at at 'right place at the right time'. I mean, it was, but it's just bloody well fixed. Made me laugh. -
Football/Soccer anyone?
3 more years for both, Barca and United IMO. The transfer ban for Barca and no CL for United change things monumentally for either club. And Messi's deteriorating form, I doubt he'll ever go back to his peak i.e the last 3, maybe 4 years. His golden days are over especially considering Xavi...