Advanced Higher Chemistry 2018-19

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Reply 60

lois_____

aw yeah I see thanks

Reply 61

chic geek

thank you x

Original post by Mhussain01

So from 0.100 mol of PCl5, 0.0420 mol of PCl3 is formed. Therefore 0.0420 mol of Cl is also formed as it’s a 1-1 mole ratio between PCl3 and Cl. To find the no. of moles of PCl5 there are after equilibrium has been established: 0.100 - 0.0420 = *0.0580 mol* of PCl5

And then you calculate the equilibrium constant K using the usual equation. Hope that helped!

Reply 62

chic geek

hi can someone help me with this please?

A student carried out an experiment to determine the value of y in hydrated zinc ethanoate, Zn(CH3COO)2.yH2O. A 5∙00g sample was heated until all the water was removed and a constant mass of 4∙18 g was obtained.

(B) Calculate the value of y.

Reply 63

_nim1

Original post by chic geek

Reply 64

A_Ch

Can someone help me with this question?

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Reply 65

lois_____

Do you have the answer ? I would think it’s pH =3

Original post by A_Ch

Can someone help me with this question?

The answer is B

How did you get that? I don’t understand these questions 😪

Original post by lois_____

Do you have the answer ? I would think it’s pH =3

Thanks x

Original post by Mhussain01

Reply 70

_nim1

I missed the @SCHOLARuk chemistry revision session and it’s not been recorded :/ does anyone have the answers to the questions that were done on there?

Reply 71

lois_____

anyone know how to do the q on the left ?

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Reply 72

lois_____

Does anyone know if we need to know about colour cancelling to emit other colours or anything along those lines about colours ?

Reply 73

Mhussain01

I would say the answer is C. For a molecule to react with HCl AND NaOH it needs to have both a H group and an OH group which react to produce 2 molecules of water.

Original post by lois_____

anyone know how to do the q on the left ?