2016 H2 Chemistry JC1 & 2 students post your questions here

UltimaOnline SG

what is the product when butene reacts with IBr

Major product is 2-bromo-1-iodobutane, minor product is 1-bromo-2-iodobutane.

Jh2424 SG

Hello, I would like to ask something related to Ionisation Energy.

I understand that Xenon has a lower first Ionisation Energy as compared to the other noble gases. I find that there can be multiple reasons for which this happens( better shielding by inner shell electrons/ lesser attraction to nucleus due to larger atomic size)

So if a question were to ask for an explantion of why Xenon has a lower first Ionisation Energy as compared to other noble gases, should I put both of the reasons stated above or it can be a case of either/or

Thanks :)

UltimaOnline SG

Hello, I would like to ask something related to Ionisation Energy.

Thanks :)

Are you a J1 or J2 student in 2017?

Always give all relevant factors for any question. Here, both are relevant and required.

Jh2424 SG

Are you a J1 or J2 student in 2017?

Always give all relevant factors for any quetion. Here, both are relevant and required.

Hmm I see, thank you :)

Jh2424 SG

Hello, I have another question regarding Ionisation Energy

For noble gases, as to why they have the highest Ionisation Energy among the elements, is it because they are at the end of the period(where they have increased nuclear charge) or is it because they have a stable electronic configuration hence making extraction of electrons difficult

Thanks :)

UltimaOnline SG

Hello, I have another question regarding Ionisation Energy

Thanks :)

The former, of course. The latter is not a valid explanation, merely a desperate attempt at 'smoking'.

Jh2424 SG

The former, of course. The latter is not a valid explanation, merely a desperate attempt at 'smoking'.

Oh I see, thank you

cienhan SG

i love chem!!

yirong99 SG

I love chem!

Jh2424 SG

Hello, would like to ask a question

As to why c=c is stronger than c-c bond, is it because of the additional pi bond, or because the sigma bond in c=c is shorter due to increased S character in the sp2 hybridization causing the bond to be closer to the nucleus?

UltimaOnline SG

Hello, would like to ask a question

Both, of course. In the A level exams, for any question, if you dunno which one Cambridge wants, always give both or all reasons.

I'm locking this thread now, and setting up a new H2 Chem thread for 2017.

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