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Author Topic: CHEMISTRY PAPER 1 HERE  (Read 38839 times)

Offline unknown

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Re: CHEMISTRY PAPER 1 HERE
« Reply #195 on: June 11, 2009, 04:24:44 pm »
Quote from: simba on June 11, 2009, 04:16:31 pm
will someone explain to me question 11 november07
hey lsn d ans is b
d eq is like 1mol of org. + 8mol of 02
so c6h90h+ 8o2= 6co2+ 5h20
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Offline XGhostX

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Re: CHEMISTRY PAPER 1 HERE
« Reply #196 on: June 11, 2009, 04:29:54 pm »
Can any one give me any tips to do with chemistry, its the hardest subject ever  :( :'(
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XD

Offline Aishath

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Re: CHEMISTRY PAPER 1 HERE
« Reply #197 on: June 11, 2009, 04:30:53 pm »
Quote from: madee on June 11, 2009, 04:23:33 pm
Quote from: Aishath on June 11, 2009, 04:20:02 pm
Can someone help me for ques. 36 in OCT/NOV 1997?
can u send me the paper i dont have it or atlst write the comp que
Well i ll write the ques.
"Which structure is that of an alkane?
A.Ethanoic acid
B. Propanol
C. Ethyl Ethanoate
D. Pentane"
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Offline sweetie

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Re: CHEMISTRY PAPER 1 HERE
« Reply #198 on: June 11, 2009, 04:31:22 pm »
cn any1 plz attach chem ppr 1 oct08????????
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #199 on: June 11, 2009, 04:31:35 pm »
Quote from: Aishath on June 11, 2009, 04:30:53 pm
Quote from: madee on June 11, 2009, 04:23:33 pm
Quote from: Aishath on June 11, 2009, 04:20:02 pm
Can someone help me for ques. 36 in OCT/NOV 1997?
can u send me the paper i dont have it or atlst write the comp que
Well i ll write the ques.
"Which structure is that of an alkane?
A.Ethanoic acid
B. Propanol
C. Ethyl Ethanoate
D. Pentane"

pentane
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some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #200 on: June 11, 2009, 04:32:09 pm »
Quote from: notty_me on June 11, 2009, 04:31:22 pm
cn any1 plz attach chem ppr 1 oct08????????
download it frm freeexampapers.com
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some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline Aishath

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Re: CHEMISTRY PAPER 1 HERE
« Reply #201 on: June 11, 2009, 04:34:08 pm »
Quote
pentane

Ya well thats wat i thought too bt the mark scheme says its ethyl ethanoate :-\
so that means the mark scheme is wrong???
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Offline noor92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #202 on: June 11, 2009, 04:34:39 pm »
Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #203 on: June 11, 2009, 04:35:43 pm »
Quote from: Aishath on June 11, 2009, 04:34:08 pm
Quote
pentane

Ya well thats wat i thought too bt the mark scheme says its ethyl ethanoate :-\
so that means the mark scheme is wrong???
lemme chk this out it cannot be ethl ethanoate wait a sec
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some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline astarmathsandphysics

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Re: CHEMISTRY PAPER 1 HERE
« Reply #204 on: June 11, 2009, 04:39:48 pm »
Quote from: Aishath on June 11, 2009, 04:20:02 pm
Can someone help me for ques. 36 in OCT/NOV 1997?

An alkene is a hydrocarbon with a C=C double bond

B
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #205 on: June 11, 2009, 04:41:42 pm »
Quote from: madee on June 11, 2009, 04:35:43 pm
Quote from: Aishath on June 11, 2009, 04:34:08 pm
Quote
pentane

Ya well thats wat i thought too bt the mark scheme says its ethyl ethanoate :-\
so that means the mark scheme is wrong???
lemme chk this out it cannot be ethl ethanoate wait a sec
it cannot be if consider it on the basis of a single bond den all of dem have single bonds even the basic formula of CnH2n+2 doesnt apply den how is it possible
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some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline unknown

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Re: CHEMISTRY PAPER 1 HERE
« Reply #206 on: June 11, 2009, 04:42:25 pm »
Quote from: noor92 on June 11, 2009, 04:34:39 pm
Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
bond breaking endo n bond formin exo
thts y x n y bond break so weak  as d reaction exo i hope u get it n as far d other q in y it has 2 be more  as its excess so y inc. hm me 2 also dnt knw hw 2 explain tht bt i hope u gt d other 1
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Offline Aishath

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Re: CHEMISTRY PAPER 1 HERE
« Reply #207 on: June 11, 2009, 04:44:58 pm »
Quote
lemme chk this out it cannot be ethl ethanoate wait a sec
it cannot be if consider it on the basis of a single bond den all of dem have single bonds even the basic formula of CnH2n+2 doesnt apply den how is it possible
[/quote]
I have no idea.....
i think the mark scheme is wrong cos many times it happened to the other papers....
So the ans. should be pentane
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Offline astarmathsandphysics

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Re: CHEMISTRY PAPER 1 HERE
« Reply #208 on: June 11, 2009, 04:46:08 pm »
Quote from: noor92 on June 11, 2009, 04:34:39 pm
Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks

Nov 03 Q 16 decreases since hydrogen is lighter than oxygen and  increases

Jun 04 Q15 C since weak bonds take little energy to break and strong bonds give out a lot of energy when they are made

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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #209 on: June 11, 2009, 04:47:04 pm »
Quote from: noor92 on June 11, 2009, 04:34:39 pm
Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
the second que goes like this
energy required to break the bonds - energy required to form bonds
so if the bonds are weaker less energy will be required to break dem n if the bonds formed r strong den more energy will be required to form dem n thus the answer u get will be neative indicating it is exo
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some people sleep to dream while othrs wakeup to follow dem im the second type how abt u
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