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Edexcel iGCSE Chemistry Paper 2C 14th June 2017 unofficial markscheme

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The H2O is on the reactants side and not in the products therefore the reactant is being hydrated. If the water molecule was on the products side then it would be dehydration

Reply 61

Leocodron

Original post by classicsgal

would i lose a mark if i forgot to put a minus sign in the energy change q. and molar enthalpy change q. ??

Yes, you would lose 1

Reply 62

Youssef 12

The last question for the molar enthalpy change was -535. I am pretty sure!

Reply 63

Leocodron

Original post by Youssef 12

The last question for the molar enthalpy change was -535. I am pretty sure!

Yes... That is what was written on the mark scheme

Reply 64

Gugjvjbvvkbv

What do you think you need for an A*?

Reply 65

Silverschist

There was the ethanol question - benefits from both production methods

Reply 66

thestudentr00m

What was the chemical equation for incomplete combustion of methanol?

Posted from TSR Mobile

Reply 67

Jose farara

Original post by rxmbi

What was the answer to whether the reaction is addition, hydration, dehydration, oxidation or reduction ..

addition and hydration

Reply 68

Bush111

Original post by GcSe KiD

4d - dibromobutene - there were 2 bromine molecules attached to the bottom

Same pinch
looks like both of us are wrong 😐

Reply 69

username3346672

Original post by Tomhebr10

There were 5 elements

there were 4 you just counted oxygen twice

Reply 70

MIr8077

Expected grade bounday ?

Reply 71

Harrrrryyyyyyy

Original post by Bush111

Same pinch
looks like both of us are wrong 😐

If you did have to write the name of the molecule including bromine then it would be dibromobutane not dibromobutene but apparently it asked for it without bromine so idk

Reply 72

Harrrrryyyyyyy

Original post by MIr8077

Expected grade bounday ?

137 a*

Reply 73

Ben2229

Original post by iSpySamer

You missed out working the energy transfer

Was there a question on titration in the paper

Reply 74

Bush111

Original post by Ben2229

Was there a question on titration in the paper

No there were no tritration quests

Reply 75

Bush111

Original post by Harrrrryyyyyyy

If you did have to write the name of the molecule including bromine then it would be dibromobutane not dibromobutene but apparently it asked for it without bromine so idk

I wrote 2,3 dibromobutane.
But anyways im going to lose marks nah frm that question :frown:

Reply 76

VeeOITNB

I made so many stupid mistakes.. :frown:

bye a-star........ :'(

Reply 77

BerylTheBird

Made a dumb mistake while working out the moles in the second to last question.(such an idiot) The rest of the working out was correct but obviously, I got a different answer. Would I get a mark or 2 for that ?

Reply 78

Tomhebr10

Original post by mir8077

expected grade bounday ?

55% b 65% a 75% a*

Reply 79

Darwinion

Q4 (e) Wouldn't colour of solution remain orange? There were no double bonds to break so bromine water should remain orange.

Q4 (d) 2,3 Di-bromobutane (though I didn't put the 2,3 bit in.)