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AQA Chemistry A2 Unit 5: Energetics, Redox and Inorganic Chemistry - 22nd June 2016

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AQA Chemistry A2 Unit 5: Energetics, Redox and Inorganic Chemistry - 22nd June 2016

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(edited 8 years ago)

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Reply 1

thenextchemist

Omg this is so early?!
Weirdo 😂 lool

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Reply 2

thenextchemist

What is the point of electrochemical cells?
Is it to allow a current to be made between the two electrodes?

Reply 3

ChronicBoredom

Can someone please explain how I'm supposed to do this question?

Deduce an equation for the redox reaction that would occur when hydroxide ions are added to HOCl

Reply 4

Larashax

Original post by ChronicBoredom

Can someone please explain how I'm supposed to do this question?

Deduce an equation for the redox reaction that would occur when hydroxide ions are added to HOCl

Hey!

Is there any way you can attach the whole question I can try and see if I can help you :smile:

Reply 5

thenextchemist

Any hard questions in any of the unit 5 chemistry papers that people have come across?

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Reply 6

thenextchemist

You know in proton and carbon nmr

You know those questions they label certain atoms of a molecule A or B and you have to tell the splitting pattern of that atom in a compound.

How are you supposed to know which 'adjacent' carbon causes the splitting pattern cause it could be different ones on either side. So which adjacent do you use?

Thanks

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Reply 7

tayoo

can someone PLEASE send me a picture of page 106 of the AQA chemistry textbook page in chapter 8- Amino acids. I left my textbook in school and need this page. Its that textbook with a girl on the front. Nelson Thornes i think

Reply 8

Larashax

Original post by tayoo

Here you go 😊

Reply 9

tayoo

Original post by Larashax

Here you go 😊

Thank you so much

Reply 10

chzm

the spec says appreciate that cells can be non-rechargeable (irreversible),rechargeable and fuel cells
but after doing a june 2011 chem 5 paper i felt like they expected us to have a deeper understanding. (e.g. why voltage decreases over time in some cells, and in some cells remains constant)

hmm, also do we need to learn in depth procedures of gas/column chromatography as the spec only says know that mixtures of amino acids can be separated bychromotography however i have seen a question in a past paper where you have to dicuss the procedure and describe retention time in more detail

Reply 11

ChronicBoredom

Pt l SO32–(aq), SO42–(aq) ll ClO3–(aq), Cl–(aq) l Pt

In conventional representation, does it matter which way the SO3 2– (aq) and SO4 2– (aq) are written??

Reply 12

chzm

how do you know when to include the platinium electrode in cell representations?

Reply 13

chzm

can someone help me with this question 5b(i) to 5(b)iv its structure determinationI got the answer right when asked to deduce the structure of P, BUT my structure was the other way around, (so the same as the mark scheme if read in the opposite direction) do you get penalised for this, as i didnt see anything that said you would in the additional comments. if you do, then can someone explain to me how you know which way to draw the structure. thank you! past paper question 5biv: http://filestore.aqa.org.uk/subjects/AQA-CHEM4-QP-JAN13.PDFmark scheme: http://filestore.aqa.org.uk/subjects/AQA-CHEM4-W-MS-JAN13.PDF

Reply 14

ChronicBoredom

This might be silly, but is a mole the same as a mol? I thought mol meant M (and therefore was a unit of conc?)

Reply 15

Signorina

Original post by ChronicBoredom

This might be silly, but is a mole the same as a mol? I thought mol meant M (and therefore was a unit of conc?)

mol means mole
M means mol dm-3

Reply 16

woojinhyuk

Can someone help please?
Why is 2-Bromo-3-methylbutane named as such? I thought the halogens had the lowest priority so it should surely be called
3-Bromo-2-methylbutane as the carbons should be numbered to give the alkyl group the lowest number.

(edited 7 years ago)

Reply 17

username986184

Original post by woojinhyuk

Can someone help please?
Why is 2-Bromo-3-methylbutane named as such? I thought the halogens had the lowest priority so it should surely be called
2-Bromo-1-methylbutane as the carbons should be named to give the alkyl group the lowest number. Also, do you need to write the one in when naming molecules like this?

1-methylbutane is called pentane

Reply 18

woojinhyuk

Original post by TeachChemistry

1-methylbutane is called pentane

Sorry. I meant why is it not called
3-Bromo-2-methylbutane

Reply 19

username986184

Original post by woojinhyuk

Sorry. I meant why is it not called
3-Bromo-2-methylbutane

Substituents in alphabetical order (as you have done) then lowest numbers assigned overall in order. If you do it the other way round in an exam I doubt you'd be penalised.