January Edexcel Chemistry IAL Unit 1 2016 (Thread)

Do all the past papers, you should be good.

when showing the formula of a product from the reaction of bromine & alkene for example, do we show OH aswell as Br or can we put Br twice as the double bond breaks?

yeah we had to show the OH as well as the Br cuz the reaction was with bromine water...if it would have been bromine in CCl4 or any other non polar solute then we can put 2 Br when the double bond breaks

Hey,
Out of interest, how did you manage studying all of AS Chemistry in just 4 months, (you're born in 1999 as your username suggests) so that got me wondering!

I didn't study all of AS chemistry in 4 months.....my school just makes us give unit 1 in jan and unit 2 and unit 3 in june

This is quite confusing guys, from all the past papers I've done so far, when it comes to the "separting funnel" question, the markscheme as well as the CGP would say that the aqueous layer is always in the lower part whereas the upper layer consists of impure halogenoalkane


So why, in this question would they say the opposite, okay, yes the answer does makes sense, something that's heavy would usually be in the bottom, but in previous past papers it was the opposite as far as I could remember

I'm afraid if this question comes up tomorrow even though it's easy, I wouldn't know which one the markscheme would want!

CGP is wrong.

If the organic compound has a density greater than 1.00 g/cm^3 then, it will be at the lower layer, if less than 1.00 g/cm^3, then it will at the upper layer.

1.00 g/cm^3 is the density of water, (Aqueous layer)

It also depends on what they're asking (The step) mentioned in the question.

What did you lot get for the value of x, I don't why I struggled with those 2 questions!

Thaank you soo much, glad it came!!

X=8 for heating method and X=11 for Titration method.

X=8 for heating method and X=11 for Titration method.

what was the purpose of adding sodium hydrogen carbonate to iodoethane (I guess) ?? I was going to write because it will neutralise the acid BUT then I changed it and wrote to remove iodine?? Not sure, but I guess I saw a similar question in previous past papers..

what was the purpose of adding sodium hydrogen carbonate to iodoethane (I guess) ?? I was going to write because it will neutralise the acid BUT then I changed it and wrote to remove iodine?? Not sure, but I guess I saw a similar question in previous past papers..

And for the titration method! they said to write the molar mass of the hydrated crystallisation I wrote 124, is that right??

The acid, wasen't mentioned in the step, but Sodium carbonate is a base, so its used to neutralize excess H+ ions, and that's what i wrote.



Eh, i don't remember. lol

I see and what did you write for why was the hydrated washing soda (i guess) heated for 3 mins?? I wrote to remove excess water.. not sure??

What did you guys write as the chemical name for sodium carbonate??

I wrote bicarbonate soda , what did you write for why was the hydrated washing soda (i guess) heated for 3 mins?? I wrote to remove excess water.. not sure??