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Edexcel GCE AS Chemistry Unit 1: 22nd May 2015 + Unit 2: 02nd June 2015

Tbh I really wanna get unit 1 done asap so that I can start preparing for the worst week in June

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What exams do you have in June? :eek:

I only have unit 2 physics, chem and then S1

Reply 581

samb1234

13

Original post by C0balt

Tbh I really wanna get unit 1 done asap so that I can start preparing for the worst week in June

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How many do you have in June? Kind of depressing I still have 7 exams after tomorrow

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Reply 582

frozo123

12

Original post by samb1234

How many do you have in June? Kind of depressing I still have 7 exams after tomorrow

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Mate I have like 11

Reply 583

samb1234

13

Original post by frozo123

Mate I have like 11

Lol that's because you're doing a2 and most as exams so its not surprising you have a lot lol

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Reply 584

C0balt

16

Original post by jshep000

What exams do you have in June? :eek:

I only have unit 2 physics, chem and then S1

I've got same and FP1
Well tbh I haven't done much stars since Easter so I have to refamilarise :tongue:

I need to do well in unit 2 physics to compensate for the silliest mistake I made in unit 1
And unit 2 chem is five times harder than unit 1 tbh lol
Then FP1, I'm very cautious about it because June 2014 was a horrendous paper lol. I got 100UMS for the mock but god knows what I will pull off in the actual one

Reply 585

gabby07

11

Would someone be able to explain mass spectroscopy to me: I get the process (ionisation, acceleration, and the lot) just not
1. how to analyse the results
2. the uses - eg. I read one question that wanted me to describe how it is used in carbon dating -- I haven't got a clue!! Would someone be able to explain these principles :smile:

Thanks.

Reply 586

frozo123

12

Original post by samb1234

Lol that's because you're doing a2 and most as exams so its not surprising you have a lot lol

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tbf if I nail M1 and S1 I can chill for maths
And if I nail tomorrow's paper I can chill for chem

Reply 587

C0balt

16

Original post by samb1234

How many do you have in June? Kind of depressing I still have 7 exams after tomorrow

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6 in June, four worst ones consecutively :/

Original post by jshep000

What exams do you have in June? :eek:

I only have unit 2 physics, chem and then S1

Oh and forgot to mention M1 and D1 but they are far apart so I am not worried just yet

Reply 588

samb1234

13

Original post by C0balt

6 in June, four worst ones consecutively :/

Oh and forgot to mention M1 and D1 but they are far apart so I am not worried just yet

I think the first week back I have chem physics m1 s1 on 4 straight days so that will be interesting

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Reply 589

jshep000

15

Original post by C0balt

I've got same and FP1
Well tbh I haven't done much stars since Easter so I have to refamilarise :tongue:

I need to do well in unit 2 physics to compensate for the silliest mistake I made in unit 1
And unit 2 chem is five times harder than unit 1 tbh lol
Then FP1, I'm very cautious about it because June 2014 was a horrendous paper lol. I got 100UMS for the mock but god knows what I will pull off in the actual one

That's weird I find both unit 2 physics and chemistry easier than the unit 1s LOL. I'm sure you'll do fine in them, just make sure you're as calm as possible!

Original post by gabby07

Would someone be able to explain mass spectroscopy to me: I get the process (ionisation, acceleration, and the lot) just not
1. how to analyse the results
2. the uses - eg. I read one question that wanted me to describe how it is used in carbon dating -- I haven't got a clue!! Would someone be able to explain these principles :smile:

Thanks.

Carbon dating is a method for working out age of carbon based things. Carbon-14 is radioactive so it decays, living things take in fresh carbon so the amount stays constant. Scientists can use mass spec to measure how much carbon-14 an ancient plank of wood contains. It is also used in the pharmaceutical industry to identify the compounds in possible new drugs.
Not sure if this is all relevant or need to know information, but there you go :tongue:

Reply 590

retrobaht

1

Original post by C0balt

Tbh I really wanna get unit 1 done asap so that I can start preparing for the worst week in June

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preach it

Reply 591

frozo123

12

Original post by gabby07

Would someone be able to explain mass spectroscopy to me: I get the process (ionisation, acceleration, and the lot) just not
1. how to analyse the results
2. the uses - eg. I read one question that wanted me to describe how it is used in carbon dating -- I haven't got a clue!! Would someone be able to explain these principles :smile:

Thanks.

Basically there's an equilibrium of Carbon 14 between the atmosphere and living organisms
when an organism dies, the concentration of Carbon 14 slowly decreases ( has some big half life )
so the older something is, the less C14 it has, so it can be traced where abouts in the time line the fossil is from.
Other uses, pharmaceutical industry, urine samples to test for illegal substances such as PED's

Reply 592

gabby07

11

Original post by jshep000

That's weird I find both unit 2 physics and chemistry easier than the unit 1s LOL. I'm sure you'll do fine in them, just make sure you're as calm as possible!

Carbon dating is a method for working out age of carbon based things. Carbon-14 is radioactive so it decays, living things take in fresh carbon so the amount stays constant. Scientists can use mass spec to measure how much carbon-14 an ancient plank of wood contains. It is also used in the pharmaceutical industry to identify the compounds in possible new drugs.
Not sure if this is all relevant or need to know information, but there you go :tongue:

Thanks very much. So if you can use mass spec to find the abundance of C-14 in a sample, and you use the half life, how is possible to determine the age? I don't see how there is enough information there

Reply 593

retrobaht

1

Original post by swanny123

Question:
(d) Give the structural formula of the organic product of the reaction of ethene, CH2 CH2, with:

acidified aqueous potassium manganate(VII). whys it: CH2OHCH2OH (formula for potassium manganate??)

bromine water: why is it: CH20HCH2BR (thought bromine water was Br2??)

Bromine WATER: Bromine water is a dilute solution, it contains more water molecules than bromine; the carbocation formed (intermediate) reacts with the water (so an OH group is added)
In summary, because its bromine water not just bromine, an OH and a Br are added.

For the potassium manganate: the potassium manganate oxides the alkene to make a diol (alcohol with two -OH groups)
! remember potassium manganate can be used as a test for alkenes, it turns from purple to colourless in presence of alkenes.

Reply 594

BBeyond

15

is there an efficient way to do questions like this?
http://gyazo.com/92cc10e24196d62b4df047f75f8a9eda

it's normally just a number grind for me tbh where i go through all the options

Reply 595

ST_123

5

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Chemistry/2013/Exam%20materials/6CH01_01_que_20100114.pdf

For q17b) what type of experiment do i draw?

Also how many experiments would we need to be able to draw and label?

Reply 596

C0balt

16

Original post by samb1234

I think the first week back I have chem physics m1 s1 on 4 straight days so that will be interesting

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FP1 instead of M1 for me. Idk why AQA put M1 so late lol it's Friday of the second week of June

Original post by jshep000

That's weird I find both unit 2 physics and chemistry easier than the unit 1s LOL. I'm sure you'll do fine in them, just make sure you're as calm as possible!

I am better at physics unit 2 but the boundaries suggest that unit 2 is harder as a public opinion lol
Chem unit. 2 is just, I hate the questions in section C where you have to relate to the passage. And too much organic for my liking lmao

Reply 597

Supermanxxxxxx

5

Anyone have the link for the 2015 ial paper

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Reply 598

BBeyond

15

Original post by ST_123

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Chemistry/2013/Exam%20materials/6CH01_01_que_20100114.pdf

For q17b) what type of experiment do i draw?

Also how many experiments would we need to be able to draw and label?

collection over water/using a gas syringe.

Reply 599

swanny123

1

Original post by retrobaht

Bromine WATER: Bromine water is a dilute solution, it contains more water molecules than bromine; the carbocation formed (intermediate) reacts with the water (so an OH group is added)
In summary, because its bromine water not just bromine, an OH and a Br are added.

For the potassium manganate: the potassium manganate oxides the alkene to make a diol (alcohol with two -OH groups)
! remember potassium manganate can be used as a test for alkenes, it turns from purple to colourless in presence of alkenes.

Okay thank you very much! However, Im pretty sure ive seen bromine water as HBr? :s-smilie:

Edexcel GCE AS Chemistry Unit 1: 22nd May 2015 + Unit 2: 02nd June 2015

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