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OCR Gateway Chemistry C4C5C6 - 13/06/13

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Reply 200
Original post by AsianNoodles
Hi, can someone please explain electrolysis in the simplest way they can cause I don't understand it whatsoever? Thanks.


everything you need : http://www.youtube.com/user/GCSEChemistryTeacher/search?query=electrolysis

[video="youtube;bBWVsWCexFA"]http://www.youtube.com/watch?v=bBWVsWCexFA[/video]

but levils explanation is esier to understand...and quicker :biggrin:
Original post by ryanb97
everything you need : http://www.youtube.com/user/GCSEChemistryTeacher/search?query=electrolysis

[video="youtube;bBWVsWCexFA"]http://www.youtube.com/watch?v=bBWVsWCexFA[/video]


Grrr, now he won't read my reply :mmm:
Reply 202
Original post by L'Evil Fish
Grrr, now he won't read my reply :mmm:


hehe...lets +rep you for the effort.. lol

ok..im guessing tomorrow will be the day for your 30,000 post :biggrin:

ryan

Edit: PRSOM ....grrr
Original post by ryanb97
hehe...lets +rep you for the effort.. lol

ok..im guessing tomorrow will be the day for your 30,000 post :biggrin:

ryan


Not that early!:eek:
Reply 204
Original post by L'Evil Fish
Not that early!:eek:


Definitely by friday though !

Is anyone doing C4/C5 revision ?
C4 is a doddle-dot and cross/covalent bonding and percipitation are the main headaches!
The calculation parts of c5 is easy....some bits are annoying!
c6 is the hardest GRRR i don't get hydrogen fuel cells or equilibrium!
Original post by ryanb97
Definitely by friday though !

Is anyone doing C4/C5 revision ?


Well, I think I just have to learn equations and I'm done!


CCl(2)Fl(2) ---> CClFl(2) + Cl¤
Cl¤ + O(3) ---> ClO¤ + O(2)
ClO¤ + O(3) ---> 2O(2) + Cl¤

I think :redface:
Reply 207
Original post by L'Evil Fish
Well, I think I just have to learn equations and I'm done!


CCl(2)Fl(2) ---> CClFl(2) + Cl¤
Cl¤ + O(3) ---> ClO¤ + O(2)
ClO¤ + O(3) ---> 2O(2) + Cl¤

I think :redface:


Gr... im starting C6 today...hopefully finish it by about 1..then smash through load of questions :biggrin:
When is your C3 exam,,or have you took it,,,,its normally before c4?

Ryan
Original post by ryanb97
Gr... im starting C6 today...hopefully finish it by about 1..then smash through load of questions :biggrin:
When is your C3 exam,,or have you took it,,,,its normally before c4?

Ryan


How can you finish C6 within a few hours?
Hey please can someone explain to me how and why temperature and pressure affects equilibrium. :cool:
Reply 210
Original post by IHTWFR
How can you finish C6 within a few hours?


remember...we are revising..not learning :biggrin:
Original post by ryanb97
remember...we are revising..not learning :biggrin:


True but it depends on how you're revising, I guess you're reading it out?
Reply 212
Original post by Turtlefushsia
Hey please can someone explain to me how and why temperature and pressure affects equilibrium. :cool:


when you increase the temprature, equilibrium tries to oppose it, thus favours the side of the reaction which is endothermic, to reduce the amount of heat,to rreduce the temprature

when you decrease the temprature, equilibrium tries to oppose it, thus favours the side of the reaction which is exothermic,to produce more heat and even it out

With presure you need to look at the number of moles, of each Gas on both sides of the equation

If you increase the pressure, you increase the rate of the side of the equation that has more moles of gas .... so equilibrium shifts to the other side,where there are less moles,and also more of that reactant/product


Since it is a reversible reaction.... it can go both ways - so you want more product and so you change the conditions (temprature,pressure,concentration) to make more product!
Reply 213
Original post by IHTWFR
True but it depends on how you're revising, I guess you're reading it out?



Nope, reading, writing then reciting ... in that order..then i have y notes for later as well....athough i tend to make a whle new set of notes every time i revise :biggrin::biggrin:

which might just be a good thing:smile:

Ryan
Original post by ryanb97
Gr... im starting C6 today...hopefully finish it by about 1..then smash through load of questions :biggrin:
When is your C3 exam,,or have you took it,,,,its normally before c4?

Ryan


Haha, okay!

Had C3 before half term.. C4 is tomorrow!:eek:
Original post by L'Evil Fish
Okay:

Positive = Anode
Negative = Electrode

Electrolysis is breaking down through electricity.

I'll start with the easiest to understand.

Molten Lead Bromide = PbBr(2)

It's an ionic bond made up of ions:
Pb2+ and Br-

So these are now molten and flowing freely.

The Pb2+ is positive and so is attracted to the cathode. It gains 2 electrons there and becomes lead (no charge). Lead is reduced.

The Br- ions are negative and are attracted to the anode. It gives an electron to the anode and becomes Br (no charge). It is oxidized.

Yeah?


Original post by BP_Tranquility
Ah, I see thanks :smile:


Posted from TSR Mobile


Original post by ryanb97
Gr... im starting C6 today...hopefully finish it by about 1..then smash through load of questions :biggrin:
When is your C3 exam,,or have you took it,,,,its normally before c4?

Ryan



For electrolysis and half-equations will we be given the charges, say Br-, or will we need to know them?
Original post by benwalters1996
For electrolysis and half-equations will we be given the charges, say Br-, or will we need to know them?


You should know them, just look at the periodic table and check which group.
Reply 217
Original post by L'Evil Fish
Haha, okay!

Had C3 before half term.. C4 is tomorrow!:eek:


Oh thought you had a clash with physics and C4..:colondollar:

What do you think you have,,, in terms of UMS.... im guessing your confident...At least getting an A: :biggrin:
How did C3 go then ?

Original post by benwalters1996
For electrolysis and half-equations will we be given the charges, say Br-, or will we need to know them?


I think it is very easy to work it out from the peridic table :smile:
Original post by ryanb97
Oh thought you had a clash with physics and C4..:colondollar:

What do you think you have,,, in terms of UMS.... im guessing your confident...At least getting an A: :biggrin:
How did C3 go then ?



I think it is very easy to work it out from the peridic table :smile:


For C3? Urmmm... At least an A. Hopefully 90+ UMS.
Reply 219
Woo Geography over! Time to spend my whole day on Chemistry.

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