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 MaySpot on mate.(Original post by TenaciousMonkey)
Sodium? It and magnesium have the most electron shells so they have larger atomic radii, and sodium has a smaller radius than magnesium because magnesium has a greater nuclear charge in its nucleus, which holds the electrons a little closer to the centre (thereby decreasing its radius in comparison to sodium).
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Re: Edexcel Chemistry Unit 1 15th MayHello,(Original post by This Honest)
Back on.
Why does data have to be standard when carrying out calculations?
Data, or more so the experiments that the data is collected from are conducted at standard conditions (1 Atm etc..) which then allows that data to be compared with other sets of data.
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Re: Edexcel Chemistry Unit 1 15th MayAlright then, thanks Harry(Original post by HarryMWilliams)
Hello,
Data, or more so the experiments that the data is collected from are conducted at standard conditions (1 Atm etc..) which then allows that data to be compared with other sets of data.
Harry.
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Re: Edexcel Chemistry Unit 1 15th MayI'd suggest knocking out answers which you think is wrong, that might things a little easier.(Original post by Ataraxian-Walker)
I'm absolutely horrible at the MCQ section :C I did all the papers from 2008-2012 and the max i can get in the MCQ section is 12.
Does anyone have MCQs that i could do? -
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Re: Edexcel Chemistry Unit 1 15th MayGuys, in the syllabus, 1.5bi
-deduce the isotopic composition of a sample of an element eg polonium
What does that mean?
Is it just asking you to tell how many different isotopes are present when given data or something?
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Re: Edexcel Chemistry Unit 1 15th Mayi think its when you have like isoptopes of an element, like I46 AND I 47 and you have their abundance such as 60% and 40% so you do(Original post by This Honest)
Guys, in the syllabus, 1.5bi
-deduce the isotopic composition of a sample of an element eg polonium
What does that mean?
Is it just asking you to tell how many different isotopes are present when given data or something?
46x60 + 47x40 / 100 = the mass.
or im completely clueless lol -
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Re: Edexcel Chemistry Unit 1 15th MayI think that's finding the RAM(Original post by Fisheh)
i think its when you have like isoptopes of an element, like I46 AND I 47 and you have their abundance such as 60% and 40% so you do
46x60 + 47x40 / 100 = the mass.
or im completely clueless lol
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Re: Edexcel Chemistry Unit 1 15th May80%. Although it would have helped if my sixth form didn't lose one or two of the better scripts we did.(Original post by YellowAndBlack)
What did we all get for the practicals ??
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Re: Edexcel Chemistry Unit 1 15th MayAnyone else done the specimen paper? 70/80 on, fairly pleased
Also, does anyone know what the standard raw marks are for 80% and 90% UMS? (I know it depends on the paper, but on average.)Last edited by TenaciousMonkey; 14-05-2012 at 16:56. -
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Re: Edexcel Chemistry Unit 1 15th MayNot sure if its the wording or something but i think it should be larger. If not please tell me why im wrong lol...(Original post by TenaciousMonkey)
Sodium? It and magnesium have the most electron shells so they have larger atomic radii, and sodium has a larger radius than magnesium because magnesium has a greater nuclear charge in its nucleus, which holds the electrons a little closer to the centre (thereby decreasing its radius in comparison to sodium).
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Re: Edexcel Chemistry Unit 1 15th Maywoops you're right, I misread that(Original post by Enigma!)
Not sure if its the wording or something but i think it should be larger. If not please tell me why im wrong lol...
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Re: Edexcel Chemistry Unit 1 15th Mayamount of energy per mole to break a bond-bond enthalpy(Original post by YellowAndBlack)
Can someone tell me the difference between bond enthalpy and MEAN bond enthalpy, some of the questions they ask are quite strange!
energy needed to break one mole of bonds in the gas phase, averaged over many different compounds- mean bond enthalpy
