AQA CHEM1: 15th May 2012

really ? i drew 2-methlyprop-1-ene

This is not a functional group isomer because it still contains the same functional group which is the carbon- carbon double bond. Structures for cyclobutane or methylcyclopropane will both score.

Yes. They asked for the structure and not 'displayed formula'.

the question on state the crystal structure of titanium, i put metallic latice

is that right?
also i put for MgO giant ionic latice

unofficial mark scheme
http://www.thestudentroom.co.uk/showthread.php?t=2001747

yes and i questioned it on that thread aswell.....

ok. Surely you'd know by now then. You used the keywords, i.e. 'metallic' and 'ionic'.

ye but puting just 'ionic' and 'metallic' cant be right as they ask for the structure, so maybe the unofficial markscheme needs to be changed ? i dunno hopefully it is just use the keyword

Hey, you seem knowledgeable. I was wondering if you could help me please.

On question 4(b)(ii) - "Explain, in terms of its structure and bonding, why titanium has a high melting point."
Would I get CE for saying "The attraction between positive ions and delocalised electrons are strong and so there is strong metallic bonding. These bonds are strong and therefore require a lot of energy to break."

I'm worrying that I've made a contradiction/false chemical knowledge I wrote similar for the question on the ionic compound, just the ionic version obv, but can't stop worrying that I won't get any marks on those because of any contradictions! So sorry to bother you but would really appreciate if you could help give your insight please?

there's nothing wrong with saying metallic/ionic structure. It's perfectly viable. In fact, that's all I ever see them put on past mark schemes, simply the keyword, not any coefficients like 'giant' etc. You wouldn't lose marks for saying giant.

Looks like a perfect answer to me.

It asked for the type of crystal so ionic and metallic are perfectly fine.

for the question which asked us to predict the bond angle, will I still get the mark for stating 109 degrees?

I think the marks for this will be one for the equation then...

3bp [1]
repel equally [1]

(if there are no lone paris I doubt they would give a mark for talking about lone pairs)

It asked for the type of crystal so ionic and metallic are perfectly fine.