Year 12s: what will be the first way you research your future options? >>

AQA GCSE Chemistry - C2 & C3 (14th May 2015)

Scroll to see replies

Reply 340

pollyy

Definition of equilibrium please? :smile:

Reply 341

annalg

Original post by stressthistest

anyone got any ideas what some of the c3 questions will be on?? Also, help on titration calculations??

I found this website helpful:
http://www.docbrown.info/page04/4_73calcs12vct.htm

Reply 342

fmalik99

How does a hydrogen ion change into a hydrogen atom? very confused aha helppp

Reply 343

sophie598

equilibrium is when reactions happen at the same rate of each direction
If that makes sense?

Reply 344

Tarlius

Guys, if you're stuck with moles let me help :smile:

It's simple I promise, I'll make it super basic
When you look at carbon, the RFM (atomic mass) is 12, so one mole of carbon is 12 grams
Hydrogen RFM is 1, so one mole of hydrogen is 1 gram
Chlorine is 24? (Thats just from memory I'm really sorry if it's wrong) so one mole of chlorine would be 24 grams :smile:

So 6 moles of hydrogen is 6 grams and 1 mole of chlorine is 24 grams, so CH6 is 30 grams! :biggrin:

Hope I helped it's all I know!
Good luck everybody! You'll do better than you think :smile:

Reply 345

Studentz001

https://www.youtube.com/watch?v=SgUuWYU9W84
Really useful video

Reply 346

gennabm

I think there will be a 6 marker either on Crystallisation of the exothermic reaction of heating pads
or failing that, titration (they love recycling this one)
And there will almost definitely be a question on the Haber Process on the C3 paper so prepare for that
and electrolysis, acids & salts & bases too
I think the consolation comes where this years exams will be a little easier than previous years as, doing past papers, they seem to have gotten the short straw with the harder topics in the past couple!
The biology one I found was very easy but with that comes higher grade boundaries.
Good luck for tomorrow everyone! x

Reply 347

gennabm

Original post by fmalik99

How does a hydrogen ion change into a hydrogen atom? very confused aha helppp

If atoms lose electrons they become positively charged ions (cations). If atoms gain electrons, they become negatively charged ions (anions). So it's basically the other way round: if an ion gains electrons it forms a positively charged atom and if an ion loses electrons it forms a negatively charged atom :smile:

Reply 348

fmalik99

Original post by gennabm

if atoms lose electrons they become positively charged ions (cations). If atoms gain electrons, they become negatively charged ions (anions). So it's basically the other way round: If an ion gains electrons it forms a positively charged atom and if an ion loses electrons it forms a negatively charged atom :smile:

thank you so much :d

Reply 349

gennabm

Original post by fmalik99

thank you so much :d

no problem :biggrin:

good luck tomorrow!

Reply 350

Jules12345

Original post by pravster

Just remember
MASH
BAWS
CAWCS

What do they stand for?!?

Reply 351

gennabm

Original post by Katiemooney

I'm so nervous chemistry is my absolute worst subject, I worked for days straight on my isa and got an A* but I'm terrified I'm going to fail these exams, I literally know bonding help me ��

Literally feeling exactly the same but at the end of the day you can do your best and nothing more! You'll be ok, if you don't do so well it's not the end of the world x
Good luck regardless :angelwings:

Reply 352

Jhguy

Oh I'm gonna flop the c2 and c3 exams
I know I'm gonna get a good C or low B if I do minimal(1-20%) revision
But I need a least a miniumum of a strong A!!!!!!!
The Pressure is building up more than a steaming shellfish on a stove!!! :colone:

(edited 8 years ago)

Reply 353

t.thompson22

Anyone wanna discuss making salts for tomorrow? :wink:

Reply 354

t.thompson22

Original post by fmalik99

How does a hydrogen ion change into a hydrogen atom? very confused aha helppp

Gains an electron (:

Reply 355

adapttochangelad

Original post by pollyy

Definition of equilibrium please? :smile:

Chemical equilibrium is reached when the rate of the forward reaction equals the rate of the reverse reaction :smile:

Reply 356

pravster

Original post by Jules12345

What do they stand for?!?

MASH: Metal + Acid --> Salt + Hydrogen
CAWCS: Carbonate + Acid --> CO2 + H2O + SALT
BAWS: Base + Acid --> Water + Salt

Reply 357

Matt1278

Original post by stressthistest

omg this is brilliant i i think you may have just saved my life

What is cawcs?

Reply 358

shiffshaff

Possible 6 mark questions in C2:
Soluble and insoluble salts,
Polymers,
Metallic bonding or
Experiment on rate of reaction/making salts/alectroplating

Reply 359

RotomGuy

Making my predictions.

C2 6 marker might be Particle Theory
C3 6 marker could be Haber Process

C2 could have big questions on Electroplating, Polymers, Salts
C3 could have big questions on Alcohols, Carboxylic Acids and Esters, Mendeleev, Anion Testing