Edexcel chem unit 4 teacher answers

Could u post unit 5 please?

Guys for the question concerning the masses of X and Y (Cacl2) and (Na) I guess for the calculation section that's how I did it,

So it says e.g. 2.30g was absorbed by X (So X absorbed 2.30g water)
and Y excess mass of 1.90 (So 1.90g is co2)

Now work it 2.30/18 for H2O
and 1.90/44 for co2 and hence find the mass of O and mass of H2 and substract them from the overall mass
you will get ratios if you work it out.....
Don't ask me about the rest I F**ed up really bad

Reply 42

abclol3kid

Original post by hashimibrahim

Guys for the question concerning the masses of X and Y (Cacl2) and (Na) I guess for the calculation section that's how I did it,

So it says e.g. 2.30g was absorbed by X (So X absorbed 2.30g water)
and Y excess mass of 1.90 (So 1.90g is co2)

Now work it 2.30/18 for H2O
and 1.90/44 for co2 and hence find the mass of O and mass of H2 and substract them from the overall mass
you will get ratios if you work it out.....
Don't ask me about the rest I F**ed up really bad

I think it was 3.6g and 8.8g respectively not 2.3g

Reply 43

fraser ritchie xo

would other indicators work aswell? :confused:

ie phenolphalein

(edited 9 years ago)

Reply 44

dyingbreed

1

hey, for the titration question on unit 4, if you got the first 2m question will you get a follow through leading to the kc expression? otherwise you lose all the other marks...?

Reply 45

dogs4eva7

20

have you got one for unit 5 by any chance??

Reply 46

dogs4eva7

20

Original post by dyingbreed

hey, for the titration question on unit 4, if you got the first 2m question will you get a follow through leading to the kc expression? otherwise you lose all the other marks...?