Chemistry - OCR A - F322

Original post by Xetter

Hey Guys! Hope everyone's revision is going well!

Just made this thread for a few of us to fire F322 questions at each other to make sure we all get them and end up with a good mark on the summer.

I'll start off! ��

Are the only two types of 'Stereoisomerism E/Z and Cis/Trans?

Cheers, Jack ��

Posted from TSR Mobile

There's also another type of stereoisomer called enantiomers, but we learn that in A2 (its really interesting)

So glad you made this thread :wink:

Reply 2

Original post by enaayrah

There's also another type of stereoisomer called enantiomers, but we learn that in A2 (its really interesting)

So glad you made this thread :wink:

Oh really! That's good! But that's it for AS yeah?

How's your revision going? :smile:

Reply 3

Original post by Xetter

Oh really! That's good! But that's it for AS yeah?

How's your revision going? :smile:

Yup just the E/Z and cis/trans isomerisim for AS. Sometimes get confused between the two but just a review and I'll be okay :smile:

Do you prefer physical or organic chemistry?

Reply 4

username1533709

Original post by Xetter

Hey Guys! Hope everyone's revision is going well!

Just made this thread for a few of us to fire F322 questions at each other to make sure we all get them and end up with a good mark on the summer.

I'll start off! ��

Are the only two types of 'Stereoisomerism E/Z and Cis/Trans?

Cheers, Jack ��

Posted from TSR Mobile

No,I swear there is optical stereoisomers ?

Reply 5

Original post by enaayrah

Yup just the E/Z and cis/trans isomerisim for AS. Sometimes get confused between the two but just a review and I'll be okay :smile:

Do you prefer physical or organic chemistry?

Yeah, Cis is just E isomerism with both the priority groups the same and Trans is just Z with both priority groups the same.

I prefer the physical stuff if I'm honest. Naming hydrocarbons is fine but all the reactions and conditions you need to remember is just a pain in the backside. What about yourself? :smile:

Reply 6

RevisionNad

I think it will be handy to learn about optical isomers. It is a really quick topic to learn, and it may be worth going over just in case. They are non superimposable mirror images, and have chiral carbon centres, they are asymmetrical molecules and are attached to 4 different groups. So if you are asked to draw one, then it would most likely be the mirror image of the one they gave you. At A2, you need to be able to construct them both. Good luck!

Reply 7

Original post by Kadak

No,I swear there is optical stereoisomers ?

Optical isomers are enantiomers :wink:

Reply 8

RevisionNad

Maybe you can help me? How do you work out enthalpy of reaction?

Reply 9

Original post by Xetter

Physical too :tongue:

Learning all the conditions is a pain. Have you started the Green Chemistry topic yet?

Reply 10

samb1234

Original post by RevisionNad

Maybe you can help me? How do you work out enthalpy of reaction?

Directly or indirectly?

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Reply 11

username1533709

Original post by enaayrah

Optical isomers are enantiomers :wink:

.
Cool.Cant wait but we have to ace AS first.
I would like people to ask plenty of Spectroscopy questions since thats my weakest link :smile:

Reply 12

I know how to calculate the enthalpy change of Formation or Combustion if that helps? Didn't think there was an equation to work out reaction...

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Reply 13

Original post by Kadak

.
Cool.Cant wait but we have to ace AS first.
I would like people to ask plenty of Spectroscopy questions since thats my weakest link :smile:

We haven't started it yet :colone:

Reply 14

samb1234

Original post by Xetter

I know how to calculate the enthalpy change of Formation or Combustion if that helps? Didn't think there was an equation to work out reaction...

Posted from TSR Mobile

If you can't measure it directly you have to create a Hess cycle using what ever enthalpy changes they give you. The question will always be done in such a way as to allow you to have a cycle which you can then use to calculate enthalpy change of reaction

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Reply 15

Original post by enaayrah

Physical too :tongue:

Learning all the conditions is a pain. Have you started the Green Chemistry topic yet?

Yeah I have, its not too bad. Its more just remembering certain things and doing past papers on them because the answers are very repetitive :smile:

Reply 16