[mintbear]

(Original post by flink)
Also what did you guys put for the fuel cell question? The one where you had to choose from a list.

I did

Reactants - top box
energy given out - middle box
reactants have less energy - bottom box

[milworthy]

(Original post by mintbear)
I did

Reactants - top box
energy given out - middle box
reactants have less energy - bottom box

Yeah that has to be correct cos its an exothermic reaction...

[mintbear]

(Original post by milworthy)
Yeah that has to be correct cos its an exothermic reaction...

YAY! Thanks

[nickwoood]

(Original post by mintbear)
I did

Reactants - top box
energy given out - middle box
reactants have less energy - bottom box

That's what I did too! But, I'm having doubts, as I know the middle one is right but because I think it may have been "reactants have less energy" at the top, and "products" at the bottom..

[meme0609]

I put:

reactants
energy given out
products

[mintbear]

(Original post by nickwoood)
That's what I did too! But, I'm having doubts, as I know the middle one is right but because I think it may have been "reactants have less energy" at the top, and "products" at the bottom..

I am sure that the middle one was right, but i don't know about the other two. I had thought that the bottom might be "products" as well, but I doubt that the top one was "reactants have less energy" as the line on the graph was high- and you need more energy for the line to go higher.... I think

[tech10]

(Original post by SciF1)
This is correct as the reaction is exothermic, so energy is transferred to the surroundings (meaning the products themselves must give out/lose energy).

Ah good! Thanks!!

[tech10]

(Original post by SciF1)
H2 > 2H+ + 2e-

waahaa Yes this is what I did! Thanks, I wasn't too sure about this ...

[meme0609]

Well it's a bit vague
You're left with products but they have less energy so couldn't it be either?

[chelseafan]

Someone please post an unofficial mark scheme

[ben1234567890]

(Original post by tech10)
waahaa Yes this is what I did! Thanks, I wasn't too sure about this ...

i thought it was 2H.2 -4e- >2H2.0 due to the electrode reaction in a fuel cell

[tech10]

(Original post by ben1234567890)
i thought it was 2H.2 -4e- >2H2.0 due to the electrode reaction in a fuel cell

But it said that H2 was at the beginning and it deposited electrons and h+ ions I think...

[meme0609]

(Original post by ben1234567890)
i thought it was 2H.2 -4e- >2H2.0 due to the electrode reaction in a fuel cell

That's what I put

[ben1234567890]

(Original post by meme0609)
That's what I put

I'm not sure what the mark scheme will say, both are technically right so i think they will give both versions

[meme0609]

(Original post by ben1234567890)
I'm not sure what the mark scheme will say, both are technically right so i think they will give both versions

I can't actually remember what the question said so I have no clue

[meme0609]

Well actually i put 2H+ + 2e- -> H2 but its the same thing really

[sarah-lo]

Right Can someone help me please?! I'm really worried about the physics exam, I revised like a month ago and i thought i would remember it all but now all my other exams are out of the way I've looked now and i can't get my head around it Could anybody explain
Diodes
Motors
Generators
Polarisation
Radioisotopes
I'm having a mental breakdown Pleaseeeeeeeeeeeee, it would really help

[The_Soul_Patch]

Well I am sorted, i only needed a b in this aperture to get an a star overall and u think I got that comfortably

I made one or two silly mistakes but if you revised well enough, the exam was pretty easy


This was posted from The Student Room's iPhone/iPad App

[chocolate1996]

(Original post by meme0609)
I put:

reactants
energy given out
products

exactly what i put...

[Barbiie]

What do you think the highest it could be for the A* boundary?


This was posted from The Student Room's iPhone/iPad App