AQA AS Chemistry Paper 1 2018 Unofficial Mark Scheme

OP

Original post by Clarareeves2001

The last question about the effect of lone pairs on bond angles was to do with lone pair lone pair repulsion being threaten than lone pair bonding pair repulsion so it would decrease the angle in a tetrahedral to 104.5 (bent)

Okay, will add that :thumbsup:

Reply 3

There was a question about the strongest type of intermolecular force in SF4

Reply 4

Original post by Vanilla Twilight

There was a question about the strongest type of intermolecular force in SF4

That was vdw

Reply 5

OP

Original post by Vanilla Twilight

There was a question about the strongest type of intermolecular force in SF4

Oh yeah, thank you!! Will add that in!
SiF4? or just SF4?

Reply 6

Original post by nyxnko_

Oh yeah, thank you!! Will add that in!
SiF4? or just SF4?

Sorry you're right - it was SiF4!

Reply 7

OP

Original post by Vanilla Twilight

Sorry you're right - it was SiF4!

Okay

Reply 8

Someone do answers to multiple choice please :smile:

Reply 9

Original post by nyxnko_

Okay

I just remembered, there was also a question towards the beginning about choosing the atomic size of the Na+ and F- ions which I think was that they were the same size because of same no. of electrons

Reply 10

Laurenpaige1212

11

I thought it was that Na was smaller because even though there was the same number of electrons, Na has a higher nuclear charge, meaning he attraction is higher, lowering the atomic radius

Reply 11

Original post by Vanilla Twilight

I just remembered, there was also a question towards the beginning about choosing the atomic size of the Na+ and F- ions which I think was that they were the same size because of same no. of electrons

I said that but don’t think it’s right

Reply 12

Original post by Chloet5827

I said that but don’t think it’s right

Yeah I don't think its right either :frown:

I think you had to consider the proton number

Reply 13

Original post by Vanilla Twilight

Yeah I don't think its right either :frown:

I think you had to consider the proton number

Yeah

can you remember any of the multiple choice I think we should put some answers together for those now :smile:

Reply 14

username2912782

Did people see on the Mr question it asked you to define what relative molecular mass is.

Reply 15

a_shah

5

Original post by Vanilla Twilight

I just remembered, there was also a question towards the beginning about choosing the atomic size of the Na+ and F- ions which I think was that they were the same size because of same no. of electrons

i said F was smaller as its in period 2 whereas Na is in period 3, so F has less shells hence smaller

Reply 16

sh_ad_ow

8

was the mr 72.4, first few answers 1210 ppm and 0.854kg and x = 5.68
and the mass of KI was 19.7g?

Reply 17

OP