edexcel IGCSE chemistry 1CR 2016

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Reply 120

Talha9

Original post by MohaimenH

I did the same as well.

If that was reaction 3 and 4 and am loosing 1 marks coz i wrote reaction 4 and 6 :/

(edited 7 years ago)

Reply 121

Talha9

Can some 1 tell me what was the last answer in Chromatography question ? The question after Rf value of Chromatography ?

What about the answer for the question ? Is SO2 is in excess or not ?

(edited 7 years ago)

Reply 122

MohaimenH

Original post by Talha9

Can some 1 tell me what was the last answer in Chromatography question ? The question after Rf value of Chromatography ?

What about the answer for the question ? Is SO2 is in excess or not ?

i got (1.3/6.05) = 0.215

Reply 123

nusquam

Original post by MohaimenH

i got (1.3/6.05) = 0.215

For me, I measured 6cm, so I got a value of 0.2.

Reply 124

Talha9

1-What can be the grade boundaries ? Any prediction ?

2-When will be grade boundaries out ?

3-When will be mark scheme will be out ?

Reply 125

PC.police

Original post by Talha9

1-What can be the grade boundaries ? Any prediction ?

2-When will be grade boundaries out ?

3-When will be mark scheme will be out ?

Probably lower, so maybe 132 for A*, grade boundaries will be out at the end of this year and mark scheme will be out next year. You'll get ur grades b4 both

Reply 126

Talha9

Original post by PC.police

I ticked the 1 3 5 th boxes. And i did 1.3/6 for the last one

Even i ticked 3 before ! later i changed coz it was not in the result of chromatography ! 2 was right. Not sure about 5 :/

Reply 127

PC.police

Original post by Talha9

Even i ticked 3 before ! later i changed coz it was not in the result of chromatography ! 2 was right. Not sure about 5 :/

im pretty sure boxes 1 3 5 were right i checked them

Reply 128

Talha9

Original post by PC.police

im pretty sure boxes 1 3 5 were right i checked them

OK ! maybe i got that wrong !
Btw dude ? do you remember what was the answer for the question which was after RF value, the question below RF value ? and the question why is solvent below the paper ?
Can you answer these 2 question ?

Reply 129

PC.police

Original post by Talha9

pm me but 1.3/6 0.216 and i wrote so the dyes stick to the paper for whys the solvent below the line

Reply 130

nusquam

Original post by Talha9

1-What can be the grade boundaries ? Any prediction ?

2-When will be grade boundaries out ?

3-When will be mark scheme will be out ?

Last year the grade boundary for an A* was 75%, and since this paper was harder, I'm assuming it's going to be around 70/72%. So that would be around 129/130 marks out of 180.

Reply 131

ixam500

Original post by nusquam

Last year the grade boundary for an A* was 75%, and since this paper was harder, I'm assuming it's going to be around 70/72%. So that would be around 129/130 marks out of 180.

Isnt it out of 360 for all 3 combined, or did I miss out something crucial?

Reply 132

Talha9

Original post by nusquam

Last year the grade boundary for an A* was 75%, and since this paper was harder, I'm assuming it's going to be around 70/72%. So that would be around 129/130 marks out of 180.

I crave grade boundaries will be low. Since i did alot of silly mistakes

Reply 133

MohaimenH

Original post by PC.police

pm me but 1.3/6 0.216 and i wrote so the dyes stick to the paper for whys the solvent below the line

I think the answer is :

So that the spots do not dissolve before the experiments start.

Pretty sure thats the correct answer ^

Reply 134

MohaimenH

Original post by nusquam

For me, I measured 6cm, so I got a value of 0.2.

There is a range. So, i guess we're both fine :smile:

Reply 135

Talha9

Original post by MohaimenH

There is a range. So, i guess we're both fine :smile:

What was the answer for question which was below RF value question ?
Some 1 remember that question ?

Wb the enthalpy change ? How we had to do it ? was it compulsory to multiply 1.00 with 1000 ? or with something else before calculating enthalphy change ?

Original post by Talha9

What was the answer for question which was below RF value question ?
Some 1 remember that question ?

answered it before.

Original post by MohaimenH

I think the answer is :

So that the spots do not dissolve before the experiments start.

Pretty sure thats the correct answer ^

Original post by Talha9

Wb the enthalpy change ? How we had to do it ? was it compulsory to multiply 1.00 with 1000 ? or with something else before calculating enthalphy change ?

I got the answer as 1162 J. Added the volume of the solutions and multiplied it by 4.2 and the temp change.