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AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

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Reply 900

strawberry_cake

Original post by Sparkly-Star

I'm in.

Bring it on!!!!! :five:

Original post by hahaff

crappy bio revision is ruining it for chem5 im doing an all nighter too

same here, but it wasnt worth it at all since the bio went terrible :/ :frown:

Reply 901

sam_xo

Does anybody have any good ways of remembering the order of the Period 3 elements from Na to Cl? :/

Reply 902

strawberry_cake

Jan06,07,08,09 papers anyone?? :smile:

Reply 903

sam_xo

I don't have a good feeling about this exam!!! :frown:

Reply 904

a23m

Original post by sam_xo

Does anybody have any good ways of remembering the order of the Period 3 elements from Na to Cl? :/

by looking at the periodic table you are provided with perhaps...

Reply 905

Anon1993

Original post by sam_xo

Does anybody have any good ways of remembering the order of the Period 3 elements from Na to Cl? :/

You get a periodic table?! :tongue:

Reply 906

Sparkly-Star

Where can I find 7.c Jan 2011 from the book? The type of equation can't seem to find it!! :cry2:

Edit:

Also how do we know which way round the equation goes? =/

(edited 12 years ago)

Reply 907

jamest92

Original post by strawberry_cake

Jan06,07,08,09 papers anyone?? :smile:

http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FChemistry%2FAQA%2F

june 03 onwards

Reply 908

jwest

chelating ligands...anyone fancy teaching me why they're important for stabilty of complexes? are they like edta?

Reply 909

BethBeth

Original post by angel1992

how do you know this, did you do chem4 in jan and you got youe prac mark?

i sat chem 4 a week ago, and did the chem empa so jus gonna get as high as i can. got a fairly decent as grade so hoping for an a overall

Same as me! Only difference is I sat my AS exams in January and did both AS and A2 empas... Really wish I knew what I got for them, don't want to wait til august for them :eek:

Really need an A :frown:

How did you find Chem 4 on wednesday?

Reply 910

Sparkly-Star

I keep forgetting everything so it looks like I'm gonna have to keep going over it, over and over again.

Reply 911

Ammy16

can someone please explain question 1 b iii from chapter 14 exam style qz in the nelson thornes book. Ive got the answer but don't quite get it.

Reply 912

InItToWinItGetIt?

Have any of you done the Jan 10 paper? If so how did you find it?

Reply 913

kogaht

Original post by Sparkly-Star

Where can I find 7.c Jan 2011 from the book? The type of equation can't seem to find it!! :cry2:

you have to work it out yourself
you know MnO4- + 5e- + 8H+ -> Mn2+ + 4H2O
and you are told in the question
H2O2 is oxidised to O2
so H2O2 -> O2 + 2H+ + 2e- (I think)
then work out the calculation.

Reply 914

a23m

Original post by jwest

chelating ligands...anyone fancy teaching me why they're important for stabilty of complexes? are they like edta?

Yeah they are like EDTA, its usually because in the reaction, you will for more particles on the product side than the reaction side, so there is an increase in entropy. So when you plug in this increase of entropy into the gibbs equation, "DELTA G" will be more negative.

There is also something to do with equilibrium being very far to the product side, but what i said above is fine to get you the marks.

Reply 915

strawberry_cake

Original post by jamest92

http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FChemistry%2FAQA%2F

june 03 onwards

Yepp I've checked there thanks..but the jan ones from 2006 onwards have no chem5 papers anywhere :s-smilie:

Reply 916

Sakildo

Anyone know what the A* grade boundaries were on this paper during Jan 2010, June 2010 and Jan 2011? thanks.

Reply 917

Sparkly-Star

Original post by kogaht

you have to work it out yourself
you know MnO4- + 5e- + 8H+ -> Mn2+ + 4H2O
and you are told in the question
H2O2 is oxidised to O2
so H2O2 -> O2 + 2H+ + 2e- (I think)
then work out the calculation.