covalent

Question 1

what is an allotrope

Answer 1

different forms of the same element

Question 2

why is graphite used as a lubricant

Answer 2

carbon atoms arranged in layers

with weak intermolecular forces between them

require little energy to break

Question 3

what type of structure is C60 fullerene and what does this mean

Answer 3

simple molecular

low melting and boiling points

weak intermolecular forces

require little energy to break

each carbon makes 3 bonds

doesn’t conduct electricity

Question 4

why do simple molecular substances have such low melting points

Answer 4

weak intermolecular forces which do not require much energy to break

Question 5

why is ethane higher boiling point then methane (larger MR)

Answer 5

boiling breaks intermolecular forces of attraction between molecules

substances with greater MR have greater intermolecular forces of attraction which require more energy to break

so therefore more heat energy required