The A2 OCR Chemistry Thread

Original post by SavannaC

Hey, Same! My coursework messed me up :frown:

Oh, for me it was F322 (organic chemistry).

Reply 21

SyedaK

11

Hello. Anyone do OCR B?

Reply 22

Munrot07

18

We have done, rates of reaction, equilibrium, acids and lattice enthalpy so far :smile:

woop

Reply 23

m121

15

I am so crap at practicals! How do you all prepare and improve on it? :s-smilie:

I got a C on it last year and doing even worse at these A2 practicals :/ So frustrating. They tell us what vague topics we should look at and when I revise all the theory for it, it doesn't seem to help as nothing of it really comes up since it's all about the experimental side of it and calculations gahh so it's nothing I can prepare for really. What do you guys do please??

Reply 24

SavannaC

10

Original post by keromedic

Oh, for me it was F322 (organic chemistry).

Ohh, (n)
What grade did you get?

Posted from TSR Mobile

Reply 25

Original post by SavannaC

Ohh, (n)
What grade did you get?

Posted from TSR Mobile

Reply 26

hey, as anyone done the quantitative ISA on rates, kinetcs etc. I have it on thursday !

REALLY dreading it, been so busy with UCAS and volunteering and so much to do this week !!

Need an A too !! :frown:

Reply 27

Mercy.O

Original post by keromedic

Hello, I'm OCR A.
Got a B at AS.

Same here! I was 1 UMS from an A which was a bummer. I messed up in F322.

Reply 28

Original post by D41VNY

hey, as anyone done the quantitative ISA on rates, kinetcs etc. I have it on thursday !

REALLY dreading it, been so busy with UCAS and volunteering and so much to do this week !!

Need an A too !! :frown:

Yep. I got 15/15 in it :h:

.

Reply 29

omg ! I have no clue what im doing ! I thought i understood all the theory but in practicals and homeworks i completely fail !! :'(
what was on it ? :tongue:

Reply 30

kahinalouise

2

Original post by D41VNY

hey, as anyone done the quantitative ISA on rates, kinetcs etc. I have it on thursday !

REALLY dreading it, been so busy with UCAS and volunteering and so much to do this week !!

Need an A too !! :frown:

Yep, cant really say that much though, its really quite simple. Just make sure you know all the rate stuff from the book and read through the experiment sheet carefully because there a lot of chemicals you have to mix together and it can get quite confusing.
Have you done any practice in class for it ?

Reply 31

Original post by kahinalouise

Yep, cant really say that much though, its really quite simple. Just make sure you know all the rate stuff from the book and read through the experiment sheet carefully because there a lot of chemicals you have to mix together and it can get quite confusing.
Have you done any practice in class for it ?

we did but i had no clue what i was doing when we answered the questions, literally - 0 correct !

SOOO STRESSED RIGHT NOW !!

Reply 32

Original post by keromedic

Yep. I got 15/15 in it :h:

.

no ??

Reply 33

Original post by D41VNY

omg ! I have no clue what im doing ! I thought i understood all the theory but in practicals and homeworks i completely fail !! :'(
what was on it ? :tongue:

Just standard stuff. I can't remember it. Maybe you should post some of the hard homework qs so I, and others, can help :biggrin:

.

Reply 34

Original post by keromedic

Just standard stuff. I can't remember it. Maybe you should post some of the hard homework qs so I, and others, can help :biggrin:

.

okay,

how do you know what kind of tangent to draw, ie is it going towards the left (y-axis) or to the right. for example we did a practice and my gradient was completely wrong because i drew it to the left (it was 1/t on Y and volume on X)

what are the application questions like ?

how can you determine the order of reaction of another solution ? in the Q it was H+

what evidence is there that there is more than one step ?

what evidence suggests that H+ ions act as a catalyst?

Reply 35

kahinalouise

2

Original post by D41VNY

okay,

how do you know what kind of tangent to draw, ie is it going towards the left (y-axis) or to the right. for example we did a practice and my gradient was completely wrong because i drew it to the left (it was 1/t on Y and volume on X)

what are the application questions like ?

how can you determine the order of reaction of another solution ? in the Q it was H+

what evidence is there that there is more than one step ?

what evidence suggests that H+ ions act as a catalyst?

When you plot the results, you should know what line you need to draw, it should be pretty obvious.

Use values from your graph to determine the order, For example if your reaction was first order what would happen to the rate of reaction if you doubled the volume ??

Do you know what the rate determining step is, how would you find this step from the rate equation ??

To see the catalyst you would have to write out all the steps of the reaction, there would be a species that is generated in the first step and used in the second step but wouldn't appear in the overall equation, its easier to see when you do it.

Reply 36

Original post by D41VNY

okay,

1.how do you know what kind of tangent to draw, ie is it going towards the left (y-axis) or to the right. for example we did a practice and my gradient was completely wrong because i drew it to the left (it was 1/t on Y and volume on X)

2.what are the application questions like ?

3.how can you determine the order of reaction of another solution ? in the Q it was H+

4.what evidence is there that there is more than one step ?

5.what evidence suggests that H+ ions act as a catalyst?

1.The tangent has the same gradient as the curve at that point, so it depends on the curve
2.I can't remember, honestly.
3.Repeating the experiment in another solution, shouldn't affect the order.
4.If the stoichiometry of reactants in the rate equation isn't the same as reactants in the overall equation.
5.If they are used up in the reaction and regenerated at the end.

Reply 37