Edexcel Chemistry IGCSE 1C Unofficial Mark Scheme 19th May 2016

For q14 b) wouldn't 0.08 moles on the reactants side and the reactants being 2x, make the reactants be 4 times as much as the product?
I may be completely wrong, but in the exam I started to write equation 3 but then realised that 2x 0.08 would make 0.16 and the product would still be 0.4.
Can anyone clarify, because I'm not really sure?

Omg I THOUGHT WHEN THEY SAID NEAREST 0.5 DEGREES THEY MEANT LIKE ROUND IT UP. NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

it was the reactant that had 2 in front of it which means it was 2 x 0.04 = 0.08



I DID THE EXACT SAME THING
but I realised when there was a few minutes left bc I was thinking about whether I put ".0" on the end and then I realised what rounding to 0.5 actually means

it was the reactant that had 2 in front of it which means it was 2 x 0.04 = 0.08



I DID THE EXACT SAME THING
but I realised when there was a few minutes left bc I was thinking about whether I put ".0" on the end and then I realised what rounding to 0.5 actually means

For the equation for H2 +O2, the answer is water.
However, would H202 (hydrogen peroxide) be correct

For 11. e) I think the question was fairly vague, something like, draw the formula of something that could be formed when bromine reacts with an alkane, so I think more than one bromine may be ok.
I'm no expert so I may be wrong, but I put 3 bromines, one on each carbon atom.
I know this molecule does exist, (tribromopropane) but I'm just hoping someone can clarify the answer for this one?
Thanks

What's the answer to the carbon soot question?

I thought the reactant had 0.08 moles?

cant wait till i die. how many marks am i gonna lose on that

yeah someone pls help because i put 2 bromines

soot was formed because there was incomplete combustion (which produces carbon)

i don't know why that explained the energy difference but i said that energy went towards forming the soot instead of heating the water?
that is probably completely wrong

and another reason was because heat was lost to the surroundings, which always happens in calorimetry experiments

^that was all question 10 i think?



yeah it did, and in the equation it had 2 in front of it which means it had twice as many moles as the other thing



me neither i keep doing the dumbest things
probably just 1, maybe 2

Anyone do the 1CR paper?? I am dying to discuss.

god damn tricked. we all walk out that exam happy as hell and then realise the hidden damn enigma morse code matrix crap edexcel put in this paper.

they made me think carbon dioxide is an element wtf i trusted them

Holy moly I've done so bad At least I'll never have to do chemistry again

Wait why did you do the 1CR paper?

I'm sure you've done better than you think George!!! I've still got to do the paper 2 and I bet it'll be so hard...

anyone else get chromatography wrong? i said 3 dyes instead of 4. ggwp edexcel.