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need help on CHEM mCqS
The answer is B...replace 1 R group by H since an aldehyde contains an H atom bonded to the C of the -CO group...replace the -CN group by -CH2CO2CH3 in the second molecule since it behaves lyk -CN... hpe zat hlps... -
Hydrogen Bonding--chemistry
hydrogen bonding is a form of permanent dipole-dipole force...that's wat i learnt.. -
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P2 AND P3 DOUBT PLZZZZZ HELP SOLVING....
constructing a geometrical progression.. 500 000, 550 000, .... a= 500 000, r = 1.1 ar^(n-1) > 4 000 000 500 000 * 1.1^(n-1) > 4 000 000 1.1^(n-1) > 8 taking log on both sides... (n-1) log 1.1 > log 8 n-1 > 21.82 we don't count the first term since it did not take 1 hr for the culture to... -
P2 AND P3 DOUBT PLZZZZZ HELP SOLVING....
constructing a geometric progression...taking the first term to B 1... 1, 0.5, 0.25,... a= 1, r = 0.5 let ar^(n-1) = 0.05 0.5^(n-1)= 0.05 taking log on both sides... (n-1) log 0.5 = log 0.05 n-1= 4.322 we don't count the 1st term since it did not take 90 yrs to become 1...so we use the value... -
P2 AND P3 DOUBT PLZZZZZ HELP SOLVING....
5) f(x) = ln (1+x) Let y = f(x) y = ln (1+x) e^y = 1+x x = e^y -1 f^(-1)= e^x - 1 -
P2 AND P3 DOUBT PLZZZZZ HELP SOLVING....
shouldn't it b ln instead of log..?? -
P2 AND P3 DOUBT PLZZZZZ HELP SOLVING....
4) 2 log 2x = 1+ log a log (2x)^2 = log 10 + log a log 4x^2 = log 10a 4x^2 = 10a x^2 = 5a/2 x = √5a/2 -
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Maths--functions..
When x=pi/2, f(x)= 2-0 = 2 2 is the greatest positive value we can get... -
Maths--functions..
we don't learn how to sketch graph of cos^2 in A level.. -
Paper 5 (Phy + Chem)
here's the way my teacher taught me to answer the planning questions...it's better to answer pointwise, it,s clearer... hope that helps... -
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A2 Chemistry P5
When ^Hsoln becomes more exothermic, this means that it becomes more negative...that is, it decrease.. -
hellooooooo
welcome to XPF...i fink there's a whole team hre to help u...u jst need 2 ask...- soumayya
- Post #5
- Forum: Welcome Lounge
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Questions regarding Bonding.
coordinate bonding is a special type of bonding in which one atom provides both shared electrons so as to attain a stable configuration...it's in A level...so no need to worry...- soumayya
- Post #15
- Forum: O-Levels / GCSEs / IGCSE
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A2 Chemistry P5
As we move down Group I hydroxides, the bases become more soluble since the ^H soln becomes more exothermic...this is because of an increase in ionic radii of the cations from Li to Cs.... hope that helps...