Edexcel Chemistry Unit 1 15th May
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
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Re: Edexcel Chemistry Unit 1 15th MayAre you sure? It's quite a large file...(Original post by Freyma)
Link not working, Got another?
Anyway, here's Unit 1 in word, the pdf was too large to attach -
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Re: Edexcel Chemistry Unit 1 15th MayCan anyone explain Jun 2010, Qn 10? Why does the MS suggest C?
10 Which of these solutions does not contain the same total number of ions as the others?
A 10.00 cm
3
of 0.100 mol dm
−3
NaCl(aq)
B 20.00 cm
3
of 0.050 mol dm
−3
NaCl(aq)
C 20.00 cm
3
of 0.050 mol dm
−3
MgCl
(aq)
D 13.33 cm
3
of 0.050 mol dm
−3
MgCl
2
2
(aq) -
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Re: Edexcel Chemistry Unit 1 15th MayWork out the number of moles in each and then multiply that by the number of ions in each molecule (you don't need to multiply by Avogadro's constant as it would just cancel with the others). You should see why the answer is C!(Original post by verdikt)
Can anyone explain Jun 2010, Qn 10? Why does the MS suggest C?
10 Which of these solutions does not contain the same total number of ions as the others?
A 10.00 cm
3
of 0.100 mol dm
−3
NaCl(aq)
B 20.00 cm
3
of 0.050 mol dm
−3
NaCl(aq)
C 20.00 cm
3
of 0.050 mol dm
−3
MgCl
(aq)
D 13.33 cm
3
of 0.050 mol dm
−3
MgCl
2
2
(aq)
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Re: Edexcel Chemistry Unit 1 15th May(Original post by TenaciousMonkey)
Yeah, 'cause I spend my time trying to get girls from TSR by seducing them with chemistry revision :P
You, I, and the rest of the world knew what you were thinking 
You start with chemistry ... and soon you'll be discussing biology
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Re: Edexcel Chemistry Unit 1 15th MayWhat can I say? You got me.(Original post by YellowAndBlack)
You, I, and the rest of the world knew what you were thinking
You start with chemistry ... and soon you'll be discussing biology
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Re: Edexcel Chemistry Unit 1 15th MaySomething floating in acid collecting a gas of some description, thats a favourite and also very easy to mock.(Original post by Ricky1995)
Anybody hazard a guess at what experiment we may have to draw out?
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Re: Edexcel Chemistry Unit 1 15th MayWhat do you need to know in particular?(Original post by fifty_six)
can sum1 help me with mechanism drawing and curly arrows -
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Re: Edexcel Chemistry Unit 1 15th MayShow, in full, the mechanism for this reaction in which ethene is converted to(Original post by TenaciousMonkey)
What do you need to know in particular?
chloroethane. -
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Re: Edexcel Chemistry Unit 1 15th Mayhelp is really needed ..(Original post by UserInvalid)
Usually it is unit 1 chemistry that is the hardest, luckily I got away with it in my first go.
Any way I can help you guys out?
impo topic -
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Re: Edexcel Chemistry Unit 1 15th Mayhow to handle MCQs and hesses law(Original post by UserInvalid)
go ahead and ask. -
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Re: Edexcel Chemistry Unit 1 15th MayI didn't get what you mean by MCQ(Original post by fifty_six)
how to handle MCQs and hesses law
but for hesses, remember you need to know the defination clearly to be able to solve it.
it is just like solving vectors, there are two directions you can solve the question, one is always unknown and the other is known. Sometimes you will have to turn the arrow, and when you turn the arrow the, if it is exo- (negative) it becomes endo (positive), vice versa.
Remember the definations, that is the key to solve it. And sometimes remember, they add 2 moles instead of 1 in the reaction equation, so you just simply multiply the enthalpy by two. -
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Re: Edexcel Chemistry Unit 1 15th MayIn my opinion after having done a billion multiple choice questions in the various past papers is don't look for the right answer straight away unless its blazingly obvious.(Original post by fifty_six)
how to handle MCQs and hesses law
Some of them require you to think outside of the box so look at the question and attack it logically, elimate answers that it can't possibly be and if you are left with a 50% chance between two final answers at least thats betters than a 25% with 4.Last edited by HarryMWilliams; 14-05-2012 at 20:07. -
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Re: Edexcel Chemistry Unit 1 15th Maythank u .. i hope this will help. what other topic i need to knw..(Original post by HarryMWilliams)
In my opinion after having done a billion multiple choice questions in the various past papers is don't look for the right answer straight away unless its blazingly obvious.
Some of them require you to think outside of the box so look at the question and attack it logically, elimate answers that it can't possibly be and if you are left with a 50% chance between two final answers at least thats betters than a 25% with 4.
