Qualification > Sciences
CHEMISTRY PAPER 1 HERE
girl_92:
--- Quote from: madee on June 11, 2009, 04:35:43 pm ---
--- Quote from: Aishath on June 11, 2009, 04:34:08 pm ---
--- Quote ---pentane
--- End quote ---
Ya well thats wat i thought too bt the mark scheme says its ethyl ethanoate :-\
so that means the mark scheme is wrong???
--- End quote ---
lemme chk this out it cannot be ethl ethanoate wait a sec
--- End quote ---
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
unknown:
--- Quote from: noor92 on June 11, 2009, 04:34:39 pm ---Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
--- End quote ---
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
Aishath:
--- Quote ---lemme chk this out it cannot be ethl ethanoate wait a sec
--- End quote ---
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
astarmathsandphysics:
--- Quote from: noor92 on June 11, 2009, 04:34:39 pm ---Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
--- End quote ---
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
girl_92:
--- Quote from: noor92 on June 11, 2009, 04:34:39 pm ---Can someone explain Nov 03 Q 16 aaanndd Jun 04 Q15? Thanks
--- End quote ---
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
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version