i don't understand how to put what i know on paper for any chemistry question that comes up on bonding, what do i do?
for example, the other day i did this question:
compare the similarities and differences in the properties and structure of metals and graphite
this is what i wrote: both metals and graphite are giant structures. metals are arranged in regular patterns (in layers) whereas graphite is arranged in hexagonal covalent bonds with weak bonds within their layers; metals are malleable because their layers can slide whereas graphite's layers make it slippery. Both metals and graphite have high melting and boiling point due to strong inter molecular forces between the molecules. They both conduct electricity; graphite has delocalised electrons that carry charge whereas metals have a 'sea' of electrons that can carry the charge.
1)i only got 3 marks and this was out of 6
2) i checked the markscheme and where i said "have high melting and boiling point due to strong inter molecular forces between the molecules" it said they had high melting/boiling points due to strong bonds holding them but i'm confused bc i though melting/boiling point is dependent on intermolecular forces
3) how do i get full marks? did i miss something or say something inccorect/vague?
4) any tips on how to revise bonding in a way i can apply it?
Memorise the mark scheme answers.You learn what the examiner wants through doing the past papers!
During melting and boiling, it is the 'bonds' that are braking, which require a lot of energy to break. The intermolecular forces between layers aren't actually that strong and that is why the use graphite in pencils, as the layers can easily slide.