HELP REQUIRED EXPERT PEOPLE!
Please solve Question 5 of Chem P3 May/June 2002.
No guesses please, because we cannot find a relevant markscheme.
PLEASE ANSWER THE QUESTION ASKED UP, AS IF YOU ARE WRITING MODEL ANSWERS BY CIE.
Thanks
Waiting....
Q5.
(a) In a liquid, the particles are close together, the intermolecular forces will not allow them to move
apart. They can move in the volume of the liquid to take up the shape of the container. In a gas,
the forces are much weaker and the particles can move apart in all directions to fill the container.
(b) (i) Volume and time were the only options, “amount”, although common was not accepted.
(ii) Carbon dioxide scored highly as the gas that would diffuse the faster but the explanation often
involved “lighter” or “smaller” or “lower mass” rather than density, relative molecular mass or speed
of molecules.
(c) (i) 110cm3
being 2:11 therefore 20:110
(ii) 80 cm
from 2:8 therefore 20:80
(iii) 120 cm
must be 150 –110 + 80
(d) moles of butyne = 1/6
moles of water = 1/2
mass of water = 9 g
hope this helps
