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Search results
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How was Bio pp3
i had put surface area and since the cross sectional area was the same, the length should be the same...i actually included both... -
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biology paper 52
how was the paper..???? i found it very confusing... -
Bio Papr 22 discussion
it was ok...but the last ques was a bit strange.. -
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How did y find the chemistry p42
i wrote that ionic bonds can no longer form becoz the carboxylic group cannot ionise...thus tertiary structure is affected... -
How did y find the chemistry p42
for the second NMR spectrum i got CH3COCH3...for NMR,i wrote H atom and electron density cloud for X Ray...wat was ze ques for the COOh..? -
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How did y find the chemistry p42
i got propan 2 ol...i got an H having 6 neighbouring H atoms..but the chemical shifts didn't match.. -
How was Bio pp3
the paper was kinda shorter than usual...i had to repeat my expt..koz i forgot to wash the samples after cutting...still, i got tym to revise...i saw a thick line for the xylem...so i drew double line... -
How did y find the chemistry p42
i could work out the paper...but didn't hve tym to revise...what was the percentage of M:M+1 in the ques on NMR...? -
Chemistery P22 (As Strustured questions)
ques 5 was a bit too short..only 3 marks.. i got NaX as NaBr...i fink for the second i put Br2 or SO2... -
Mole Concept ques!
yh...but in this ques u already get the mole ratio in whole numbers.. still..suppose u divide by the smallest mole, u get 1.5 for Mg and 1 for N.. 1.5 : 1 = 3:2 u can't just round the figures unless it is very close to a whole number...- soumayya
- Post #6
- Forum: O-Levels / GCSEs / IGCSE
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Mole Concept ques!
s09 qp 3 # 9(a) ------------------Mg : N mass------------ 72 : 28 Divide by Ar----72/24 : 28/14 No. of moles---3 : 2 Empirical formula= Mg3N2- soumayya
- Post #3
- Forum: O-Levels / GCSEs / IGCSE
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Mole Concept ques!
s07 qp3 #7 (d) 100 g of fat reacts with 86.2 g of iodine. 884 g of fat reacts with [(86.2/100)*884] = 762.008 g of iodine. One mole of fat reacts with (762.008/254) = 3 moles of iodine molecules. Number of double bonds in one molecule of fat is 3.- soumayya
- Post #2
- Forum: O-Levels / GCSEs / IGCSE
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Biology paper 42
the paper was kinda different frm wat we did in past papers...i chose Q9...it was a bit easier...just had to explain meiosis and mutation..