GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussion

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zabi1
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Havent seen a discussion topic for this. So how you guys revising? What are you mainly focusing on? Any tips on these particular exams?
Got a C and a B, need to improve them to A's so i can get an A overall

Start helping and discussing guys! Exam next week!
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zabi1
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im not the only one, anyone else on the forum doing these ?
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EmineF
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Meeeee


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zabi1
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(Original post by EmineF)
Meeeee


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nice to know, how are you revising for these papers? and what do you think most likely will come up?
ATM the tricky one is remembering the flame test colours
but other than that, the equations im ok with and the rest of the info hopes sticks into my brain
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EmineF
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(Original post by zabi1)
nice to know, how are you revising for these papers? and what do you think most likely will come up?
ATM the tricky one is remembering the flame test colours
but other than that, the equations im ok with and the rest of the info hopes sticks into my brain
I'm sure electrolysis, empirical formula, reversible reactions (i.e. The haber process) and some sort of analysing substances question will come up to test/adapt our knowledge to example an experiment they give us.
I have the AQA revision guide and it's great, it has everything you need to know so i recommend you get one if you don't have it already!
Also, i hope they don't put too much about the haber process on cos it really confuses me, especially when you have to explain the conditions and how to get an optimum yield of ammonia :/ and yeah, i find the flame test colours confusing too!


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zabi1
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(Original post by EmineF)
I'm sure electrolysis, empirical formula, reversible reactions (i.e. The haber process) and some sort of analysing substances question will come up to test/adapt our knowledge to example an experiment they give us.
I have the AQA revision guide and it's great, it has everything you need to know so i recommend you get one if you don't have it already!
Also, i hope they don't put too much about the haber process on cos it really confuses me, especially when you have to explain the conditions and how to get an optimum yield of ammonia :/ and yeah, i find the flame test colours confusing too!


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Same! the optimum yield of ammonia is confusing, the rest is just remembering the key points of each topic and feeding them to your brain,

anyone else on tsr doing these exams :borat:
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asam
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doing c2 new spec. 1hr on thursday, i honestly cant do chemistry and gonna have to best shot
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nacho1996
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I'm doing the unit 2 for chemistry higher tier. I'm finding it quite hard compared to last year as there's a lot more to remember.


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StartingTheParty
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I have a feeling they will ask a lot of How Science Works questions.

You have to think, this will be the last exam for this specification so they may pull out a load of hard questions they haven't used yet.
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PrinceyJ
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For unit 3, I opened the first past paper and completely blanked on the tests for ions. Rifling through my revision guide to find all of them and learn them.
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PrinceyJ
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Does anybody know which flame tests colours and ion tests we need to know for unit 3?

So far I've noted down Calcium, Potassium, Lithium, Sodium and Magnesium.
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SmileAway
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Hey I an quite scared cause overall out off all the science's chemistry is my lowest score:/ And I find this topic difficult!


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Tweak6
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Ahh Im doing unit 3. I just did a practice test and got 26 out of 45 :/ Maybe I should go revise some more :'(
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Koroviev
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(Original post by PrinceyJ)
Does anybody know which flame tests colours and ion tests we need to know for unit 3?

So far I've noted down Calcium, Potassium, Lithium, Sodium and Magnesium.
According to my revision guide, these are all the tests (ion and flame) we need to know:

Spoiler:
Show
Flame tests:
Dip nichrome wire into concentrated hydrochloric acid to clean it. Then dipped into compound. Put over blue flame, the flame should change colour depending on the compound, and goes as such:
Lithium: red
Sodium: yellow
Potassium: lilac
Calcium: brick red
Barium: apple green
Copper: blue-green

Carbonates + dilute acid:

Forms carbon dioxide gas.
Eg: Calcium Carbonate + Dilute Hydrochloric Acid -------> Calcium Chloride + Carbon Dioxide + Water

Thermal Decomposition of Copper and Zinc Carbonate:
You put the carbonates over a bunsen flame...
Copper Carbonate (green) -------> Copper Oxide (black) + Carbon Dioxide
Zinc Carbonate (white) ----------> Zinc Oxide (yellow) + Carbon Dioxide

Metal Ions:
(The colours in the brackets are the colour of the precipitates formed)
Aluminium (Al3+) + Sodium Hydroxide ----> Aluminium Hydroxide (white)
Calcium (Ca2+) + Sodium Hydroxide ----> Calcium Hydroxide (white)
Magnesium (Mg2+) + Sodium Hydroxide ----> Magnesium Hydroxide (white)
Copper (Cu2+) + Sodium Hydroxide ----> Copper Hydroxide (blue)
Iron (Fe2+) + Sodium Hydroxide ----> Iron Hydroxide (green)
Iron (Fe3+) + Sodium Hydroxide ----> Iron Hydroxide (brown)

Sulfate Ion + Barium chloride solution + dilute hydrochloric acid ---> Barium sulfate (white)
Nitrate Ion + aluminium powder + sodium hydroxide solution ---> ammonia (turns damp litmus paper blue)
Chloride Ion + silver nitrate solution + nitric acid ---> Silver chloride (white)
Bromide Ion + silver nitrate solution + nitric acid ---> Silver bromide (cream)
Iodide Ion + silver nitrate solution + nitric acid ---> Silver bromide (yellow)


I think that's all of it!
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PrinceyJ
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(Original post by Koroviev)
According to my revision guide, these are all the tests (ion and flame) we need to know:

Spoiler:
Show
Flame tests:
Dip nichrome wire into concentrated hydrochloric acid to clean it. Then dipped into compound. Put over blue flame, the flame should change colour depending on the compound, and goes as such:
Lithium: red
Sodium: yellow
Potassium: lilac
Calcium: brick red
Barium: apple green
Copper: blue-green

Carbonates + dilute acid:

Forms carbon dioxide gas.
Eg: Calcium Carbonate + Dilute Hydrochloric Acid -------> Calcium Chloride + Carbon Dioxide + Water

Thermal Decomposition of Copper and Zinc Carbonate:
You put the carbonates over a bunsen flame...
Copper Carbonate (green) -------> Copper Oxide (black) + Carbon Dioxide
Zinc Carbonate (white) ----------> Zinc Oxide (yellow) + Carbon Dioxide

Metal Ions:
(The colours in the brackets are the colour of the precipitates formed)
Aluminium (Al3+) + Sodium Hydroxide ----> Aluminium Hydroxide (white)
Calcium (Ca2+) + Sodium Hydroxide ----> Calcium Hydroxide (white)
Magnesium (Mg2+) + Sodium Hydroxide ----> Magnesium Hydroxide (white)
Copper (Cu2+) + Sodium Hydroxide ----> Copper Hydroxide (blue)
Iron (Fe2+) + Sodium Hydroxide ----> Iron Hydroxide (green)
Iron (Fe3+) + Sodium Hydroxide ----> Iron Hydroxide (brown)

Sulfate Ion + Barium chloride solution + dilute hydrochloric acid ---> Barium sulfate (white)
Nitrate Ion + aluminium powder + sodium hydroxide solution ---> ammonia (turns damp litmus paper blue)
Chloride Ion + silver nitrate solution + nitric acid ---> Silver chloride (white)
Bromide Ion + silver nitrate solution + nitric acid ---> Silver bromide (cream)
Iodide Ion + silver nitrate solution + nitric acid ---> Silver bromide (yellow)


I think that's all of it!
That's great, thanks!

They weren't in my CGP revision guide (or I couldn't find them).

Just done a unit 3 past paper, 40/45 yay.
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rainerised
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Anyone know what chemical analysis things we need to know like instrumental and chemical ones and how much detail we need.
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_soph1
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I think we need to know like mass spectrometry, infra red spectrometry and atomic absorption spectroscopy but i don't know in how much detail? Does anyone know of any others we need to learn?

My teacher said it isn't one of the most important thins to revise so i'm not going to worry about it too much
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vxrz
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Guys... who's got the Jan 2012 papers?!?!?
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sophie5
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(Original post by vxrz)
Guys... who's got the Jan 2012 papers?!?!?
I have both jan 2012 copies but only hard copies i think the january 2012 C3 was quite hard so fingers crossed this one will be easy for us
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vxrz
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(Original post by sophie5)
I have both jan 2012 copies but only hard copies i think the january 2012 C3 was quite hard so fingers crossed this one will be easy for us
Ahhh.. what a shame quite desperate for these as well.

Anyone?
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