AQA Chem Unit 1 May 22nd 2015 *OFFICIAL THREAD*

Thats for part two, I was asking about part 1

No it would be CH. In the diagram you can see one carbon bonded to one hydrogen. I was only using ethene as an example.

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I've taken a picture to explain my question, thank you



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I dont think it makes a difference. Have you checked a Mark scheme???

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Oh okay,
I'm not sure, I have but it doesn't give any other options.


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No it doesnt matter as the dotted lines etc are used to show 3d in prespective so it depends on the direction you're looking at the molecule. Tbh you dont have to use dotted lines at all and still get the mark

Thank you!



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I got a C when I first did the exam last year. What I've been doing throughout the year is going over my notes and making sure I have a throughout understanding of each topic. I realised this now in A2, in order to pass chemistry a level you cannot just learn and memorise. simply understand and go over past paper questions. My teacher said that the paper I sat was probably the easiest paper yet.
My advice would be to learn all the equations (PV=nRT etc.). practice as many past papers as you can. Personally I am aiming to do each past paper until I get an A in each of them. Have you used the ''A-Level Chemistry'' website? If not definitely use this, it consists of practice past paper questions relevant to each topic from the specification. If your stuck ask your teacher or watch youtube videos like khan academy or any other video that is following the AQA specification. If you want old past papers I would recommend you to use the ''xtremepapers'' website, which has papers from 2001. Just be careful that some topics in those papers were a part of the old syllabus. My teacher has also made practice papers so if you want I can send them to you. Sorry for the long post!

Not even started revising for this and I'm resitting. This is nothing compared to CHEM5 thats probably why

how do u know when to use enthalpies of formation or combustion
llike they always mention both by saying "using the enthalpies of formation find...."
so how do u know if you are supposed to draw a formation diagram in which arrows go up or a combustion diagram in which arrows go down?

- thanks

Look at the table
You know they give you the molecules or elements
And the next coloumn, it tells you the enthalpies. It will either say C or F.
Don't read the description read the table to find out whther you have to use combustion or formation.

I don't like using hess's law, but unless they tell you to do hess's law, then you do the arrow thing.


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Resitting this as well. Havent started revising, probably will like 2/3 days before. Chem 1 is a joke compared to chem 5. Make sure you use chemrevise guys. It's a life saver