AQA A-Level Chemistry June 2020 Paper 1 [Walkthrough and Tutorial]

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Timestamps:
00:00 Question 1
12:20 Question 2
19:20 Question 3
23:06 Question 4
28:30 Question 5
34:41 Question 6
39:20 Question 7
42:30 Question 8
48:24 Question 9
53:59 Question 10
1:07:57 Question 11
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[@abdurkhan0621]

nice

[@notme2472]

41:19 how does XeF4 have permanent dipole-dipole??? I thought it only has vdw due to it being planar and symmetrical?

[@user-xd1yf6ie5x]

yh ur right

[@aizahmahmood8595]

on question 4.3 how did you get 0.05 moldm-3 when the question only says 0.5 moldm-3 at 24:55

[@SMH_]

yo lads quick question
question 7,
i thought PF3 wouldn't contain dipole dipole forces because there is relatively not much difference in electronegativity between P & F, therefore it wouldn't form a polar bond,
but apparently it would still be big enough to be polar,
all molecules contain a difference in electronegativity between the elements, small or little,
so does that mean that they all (apart from the symmetrical ones) contain dipole dipole forces?

[@davidola7514]

nitrogen, fluorine and oxygen are 3 of the most electronegative elements any compound that contains those 3 usually has permanent dipole - dipole as long as its not symmetrical . I think a mistake was made in the video as XeF4 should not have dipole-dipole interactions as its symmetrical , so only temporary dipoles are created when its near another xef4 molecule and temporary dipole-dipole is van Der Waals.
hope that helps...

[@SMH_]

@@davidola7514 really appreciate that mate yeah it helps a lot

[@user-xd1yf6ie5x]

1:03:48 the mark scheme says the answer is 168 Im confused

[@sareena_]

there's always a range for answers for a gradient the mark scheme allowed 167 to 173, and the answer should be positive because the gradient is negative and equal to -delta S, so the negatives cancel out :)