Advanced Higher Chemistry 2018-19 Watch

Mhussain01
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#61
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#61
Ah okay I understand, didn’t notice that. Also just realised the pH would increase than decrease.
(Original post by _nim1)
I think the square brackets around the H+ means concentration so as you said the H+ concentration would change and the answer would be B.
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lois_____
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#62
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aw yeah I see thanks
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chic geek
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#63
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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!
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chic geek
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#64
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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.
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_nim1
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(Original post by 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.
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A_Ch
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#66
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#66
Can someone help me with this question?
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lois_____
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#67
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Do you have the answer ? I would think it’s pH =3
(Original post by A_Ch)
Can someone help me with this question?
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A_Ch
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#68
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#68
The answer is B
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_nim1
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#69
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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
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Mhussain01
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_nim1
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Thanks x
(Original post by Mhussain01)
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_nim1
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#72
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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?
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lois_____
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#73
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anyone know how to do the q on the left ?
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lois_____
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Does anyone know if we need to know about colour cancelling to emit other colours or anything along those lines about colours ?
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Mhussain01
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#75
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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 ?
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A_Ch
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#76
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#76
Wait! Today's scholar session wasn't recorded??
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A_Ch
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Im a bit confused, is 50cm^3 not 0.05 in litres?
(Original post by Mhussain01)
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Mhussain01
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#78
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It was 500cm3 (:
(Original post by A_Ch)
Im a bit confused, is 50cm^3 not 0.05 in litres?
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lois_____
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#79
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#79
Anyone know how to get part a) the k+ Conc
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_nim1
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#80
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I checked again it’s not recorded 😭 I did the question sheet and now I don’t have answers to them
(Original post by A_Ch)
Wait! Today's scholar session wasn't recorded??
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