bobbydylan
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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???
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hmsafiya
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4 hours?! What time are you writing it?
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hmsafiya
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(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.
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bobbydylan
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(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?
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Ashley_01
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What are the conditions of cracking??!?!
Help anyone!?!?!?!?!?
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thymolphthalein
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(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.
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hmsafiya
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Cracking. High temperature. No oxygen. Presence of oxygen will cause the alkane to combust!
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Ashley_01
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How was the paper? >.<
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Larky
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Terrible!
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Roma-s
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any notes for unit 3?
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Mohamed Nashaat
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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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