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Edexcel Chemistry AS Unit 2- 16th January 2013

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I'm literally screwed for this exam on Wednesday, I can't remember anything from Unit 2. I think I should've picked to resit in June instead..

Reply 41

Weaselmoose

Original post by David Tennant

I think the hat mechanism is an elimination reaction (electrophillic)?

Three products are...the alkene...water and ohhh is it..not sure

haha but-1-ene, e and z but-2-ene apparently
and yeah elimination wooo!

Reply 42

David Tennant

Original post by Weaselmoose

haha but-1-ene, e and z but-2-ene apparently
and yeah elimination wooo!

Wats de third thing you get?

Reply 43

David Tennant

Original post by flightlessbirds

I'm literally screwed for this exam on Wednesday, I can't remember anything from Unit 2. I think I should've picked to resit in June instead..

Hey, you can still get a good grade

Reply 44

Weaselmoose

Original post by David Tennant

It won't let me copy your quote for some reason.
PH3 has one pair of electrons and 3 bonding pairs so it would be v shaped...no I mean um trigonal pyramidal

total pairs = 4 so tetrahedral and 1 lp so 107.5

Reply 45

David Tennant

Original post by Weaselmoose

total pairs = 4 so tetrahedral and 1 lp so 107.5

Oh yeah, woops

Reply 46

Weaselmoose

Original post by David Tennant

Hey, you can still get a good grade

that's a lot of wishful thinking for me

Reply 47

Weaselmoose

Original post by David Tennant

Wats de third thing you get?

the three are
but-1-ene
e-but-2-ene
z-but-2-ene

Reply 48

David Tennant

Original post by Weaselmoose

that's a lot of wishful thinking for me

Ahhh don't say that :biggrin:

...
In which of the following reactions is sulfuric(IV) acid, H2SO3, acting as an oxidizing
agent?
A 2NaOH + H2SO3 Na2SO3 + 2H2O
B 2FeCl3 + H2SO3 + H2O 2FeCl2 + H2SO4 + 2HCl
C 2H2S + H2SO3 3H2O + 3S
D H2SO3 H2O + SO2

Reply 49

Weaselmoose

Original post by David Tennant

Ahhh don't say that :biggrin:

...
In which of the following reactions is sulfuric(IV) acid, H2SO3, acting as an oxidizing
agent?
A 2NaOH + H2SO3 �� Na2SO3 + 2H2O
B 2FeCl3 + H2SO3 + H2O �� 2FeCl2 + H2SO4 + 2HCl
C 2H2S + H2SO3 �� 3H2O + 3S
D H2SO3 �� H2O + SO2

baah A or C?

Reply 50

David Tennant

Original post by Weaselmoose

baah A or C?

Reply 51

Exams v__v

Hello everyone! :biggrin:

So. How do we learn the differences between reaction of halogens with hot and cold NaOH? ._.
I'm screwed. Got physics 4 the same day. D:

Reply 52

David Tennant

Original post by Exams v__v

Hello everyone! :biggrin:

So. How do we learn the differences between reaction of halogens with hot and cold NaOH? ._.
I'm screwed. Got physics 4 the same day. D:

Are we supposed to memorize these?

Reply 53

Exams v__v

Original post by David Tennant

Are we supposed to memorize these?

Yes!

Reply 54

Weaselmoose

Original post by David Tennant

Is there an easy way to work that out or just doing them all individually?
What are the trends in electronegativity and ionisation energies down grp 2?

Reply 55

Weaselmoose

Original post by Exams v__v

Hello everyone! :biggrin:

I'm screwed. Got physics 4 the same day. D:

Hello! Good luck! What board physics are you?

Reply 56

Exams v__v

Original post by Weaselmoose

Hello! Good luck! What board physics are you?

Thaaanks, I need lots of it haha!
Edexcel that too. (:

Reply 57

Weaselmoose

Original post by Exams v__v

Thaaanks, I need lots of it haha!
Edexcel that too. (:

Ah, same as us but I dropped physics haha

Reply 58

David Tennant

Original post by Weaselmoose

Is there an easy way to work that out or just doing them all individually?
What are the trends in electronegativity and ionisation energies down grp 2?

Probably just do it individually. Down the group electronegativity tends to decrease and ionisation energies also decrease.

Gosh I really hate mechanisms...