Chemistry isa burning alcohols

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Has anyone done the AQA GCSE chemistry isa on rates of reaction and burning alcohols to find energy per gram?

I have my paper 2 tomorrow and I'm really nervous. 

First of all I don't know whether my independent variable is discrete, continuous or categoric.
The Independent variable are alcohols from methane to hexane looking at carbon atoms to find which has the most energy per gram, so am I saying my data is categoric because of the alcohols or discrete because of the amount of carbon atoms?
Also do I plot a bar or line chart??
Its AQA GCSE
Any help about my question or anything about paper 2 would be great!
Thank you :D

Posted Sun 21st October, 2012 @ 19:45 by Lisa Croft