Equilibria, Energetics and Elements (F325) - June 2011 Exam.

If you mean less exothermic than yes.

no i mean more exothermic

Lattice + Solution = Hydration

So if hydration = - 2000 Kj
then lattice has to <-2000 Kj ie less exothermic

so hydration is more exothermic than lattice enthalpy :s-smilie:

Reply 1041

CoventryCity

Original post by waecskt

no i mean more exothermic

Lattice + Solution = Hydration

So if hydration = - 2000 Kj
then lattice has to <-2000 Kj ie less exothermic

so hydration is more exothermic than lattice enthalpy :s-smilie:

Why does lattice have to be < -2000
Enthalpy of solution can be +ve or -ve

Reply 1042

haydyb123

9

Original post by waecskt

no i mean more exothermic

Lattice + Solution = Hydration

So if hydration = - 2000 Kj
then lattice has to <-2000 Kj ie less exothermic

so hydration is more exothermic than lattice enthalpy :s-smilie:

have a look at the mark scheme for question 6d from jan 11

Reply 1043

Lucy23

Original post by sportycricketer

We don't need to know those btw!

daaamn i was told we did :frown:

Reply 1044

haydyb123

9

Original post by CoventryCity

Why does lattice have to be < -2000
Enthalpy of solution can be +ve or -ve

very good point.

Reply 1045

M_I

Original post by monkeyDace

purple to yellow (I could be wrong as i didn't revise this module yet)

Original post by wilsea05

purple to very pale pink.

Which one is it?

How do you figure it out?

Reply 1046

waecskt

Original post by CoventryCity

Why does lattice have to be < -2000
Enthalpy of solution can be +ve or -ve

Original post by haydyb123

have a look at the mark scheme for question 6d from jan 11

Wow, confusing. Think i've figured it out now. Thanks :smile:

Reply 1047

haydyb123

9

Original post by waecskt

Wow, confusing. Think i've figured it out now. Thanks :smile:

Yeah it it's a bit abstract, but as long as you try and picture the cycle, it makes things slightly easier I find. :smile:

Reply 1048

Maccees

15

This exam is going to be an epic fail of epic proportions D:

I'm working my way through the Jan '11 exam.

The last few questions are funking solid :banghead:

Reply 1049

volvicstar

anyone have a list of questions and answers?
I have completed all the past papers :smile:

Reply 1050

jheeze

What is likely to come up in this test.

Reply 1051

DrDr

MnO4- is purple
Mn2+ is permanent pink

To whoever was asking.

Reply 1052

kingam

Original post by Maccees

This exam is going to be an epic fail of epic proportions D:

I'm working my way through the Jan '11 exam.

The last few questions are funking solid :banghead:

you got link of jan 2011 paper

Reply 1053

CoventryCity

Original post by DrDr

MnO4- is purple
Mn2+ is permanent pink

To whoever was asking.

Mn2+ is pale pink I thought?

Reply 1054

DrDr

Original post by CoventryCity

Mn2+ is pale pink I thought?

Yep, another word for it is "permanent pink" I believe, as it is in the textbook page 219.

Reply 1055

hiyarearl

4

Feeling reasonably good about this exam. Just revised back over my notes for chapter 1 and done the practice questions again and am getting pretty much all of them right. Going to take short break then crack on with chapter 2 revision. :smile:

I'm just hoping the paper isn't stupidly hard tomorrow.

How is everyone else doing?

Reply 1056

gradu

8

Original post by hiyarearl

Feeling reasonably good about this exam. Just revised back over my notes for chapter 1 and done the practice questions again and am getting pretty much all of them right. Going to take short break then crack on with chapter 2 revision. :smile:

I'm just hoping the paper isn't stupidly hard tomorrow.

How is everyone else doing?

Not great

I seem to find the F324 a walk in the park, 90% + everytime, but this paper is like kryptonite to me! D:

Going to go take the Jan 2011 paper now, work through it thoroughly :smile: