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OCR Chemistry A F325 - Equilibria, Energetics and Elements - 12th June 2013

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Feel completely unprepared for this.
Going into college early tomorrow to revise until lunch.
What key points do you think I should definitely go over to make sure I don't completely screw this up. Kinda damage control :colondollar:

Reply 61

BaraLlama

I think there will be quite a lot of key points unfortunately:

- orders of reaction and working out rate equation
- calculating the rate constant (k)
- calculating Kc and effect on Kc
- calculating Ka
- effects of ionic size and charge on lattice enthapy and enthalpy of hydration
- entropy & free energy
- cells and electrode potentials ( know how to draw a half-cell)
- transition metals, complex ions and their reactions
- Born-Haber cycles
- Buffer solutions
- know some facts about fuel cells
- Kw calculations

There is a lot to cover in this unit and usually they manage to fit most of the things into the exam :frown:

Hope this helps and good luck tomorrow!

Reply 62

henryoloyede

Original post by BaraLlama

Hope this helps and good luck tomorrow!

That helps a lot actually, I'll go over as much of it as possible tomorrow :tongue:

Good luck to you too :smile:

Reply 63

Maryb_102

JFDGMOy54hhH&"!69;(@():'vo£;£ :angry:

()4£@;!!!!

What even...I don't even.... Ugh.

Reply 64

NerdMeister

Jeez!! That was a really difficult exam! D:

Reply 65

Shb117

Is it just me or this paper was harder than Jan 2013?

Reply 66

Shb117

Guys what are your A* grade boundary predictions?

Reply 67

mathslover1

I dont think this paper was as challenging as Jan 13! There was some weird questions but only about 6-7 marks worth. I think grade boundaries may be high

Reply 68

LivingLifeMyWay

Oh my days what even was that?

Reply 69

mathslover1

Original post by Shb117

Guys what are your A* grade boundary predictions?

83/100

Reply 70

Mathslover2

Not as hard as Jan 13, some of the questions were worded strangely but none were impossible to work out.. And the last question was much better than Jan!

Reply 71

Mathslover2

Original post by mathslover1

83/100

Why you stealing my name?

Reply 72

mathslover1

Original post by Mathslover2

Why you stealing my name?

I am 1 and you are 2

Reply 73

idrismiles

Original post by Mathslover2

Not as hard as Jan 13, some of the questions were worded strangely but none were impossible to work out.. And the last question was much better than Jan!

For real? I thought Jan 13 was much easier than that?! Wasn't a fan of that paper

Reply 74

Jazzmanic

I found that really hard, I only needed 65/100 for an a overall but I'm doubting I even got that! I'm just hoping for low grade boundaries!

Reply 75

JP.

Many people from this exam at my college found this hard - low grade boundaries!!

Reply 76

fluffylovey

I thought the last question was a bitch, mind you, jan 13 question 8 was also a bitch, so at least this time it was less marks.

Aside from question 8 and 7 the exam was ok, but question 8 oh my days x.x

Reply 77

Newtonsfirsthore

Anyone know the formula for the last question?

Reply 78

br13

That was the hardest paper i've come across, and i did all the past papers. I thought it was just consistently tricky the whole way through, surely low grade boundaries?! Was hoping for an A* but its absolutely out the window now