Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

chemistry edexcel A Level unit 3

Hey guys. Got chem IAL Unit 3b in about 4 hrs.
Feeling pretty comfortable coz ive done quite a lot of past paper 3b's. How about u guys?
Do we need to know the conditions for cracking alkanes? and sodium hydroxide + group 1/2 element precipitates? I got the sulfate test but not sure about this???

username1756683

4 hours?! What time are you writing it?

username1756683

Original post by bobbydylan

Hey guys. Got chem IAL Unit 3b in about 4 hrs.
Feeling pretty comfortable coz ive done quite a lot of past paper 3b's. How about u guys?
Do we need to know the conditions for cracking alkanes? and sodium hydroxide + group 1/2 element precipitates? I got the sulfate test but not sure about this???

Sulphate and hydroxide precipitates for group 1 and 2. Theyre all going to be white. However, for magnesium sulphate and barium hydroxide are soluble so no ppte. The rest are white. Hope that makes sense.

OP

Original post by hmsafiya

4 hours?! What time are you writing it?

well it will be 3.30pm my time?
When are you doing it?

What are the conditions of cracking??!?!
Help anyone!?!?!?!?!?

thymolphthalein

Original post by Ashley_01

What are the conditions of cracking??!?!
Help anyone!?!?!?!?!?

I think all we need to know is that thermal cracking requires high temperature/pressure and catalytic cracking requires a catalyst such as Zeolite.

username1756683

Cracking. High temperature. No oxygen. Presence of oxygen will cause the alkane to combust!

How was the paper? >.< :frown:

:frown:

Terrible!

any notes for unit 3?

Mohamed Nashaat

how was unit 3??? and what did u guys right for the equation the one worth 2 marks, in the salt analysis question?

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