Chemistry

[_sophie_]

Help me witht these questions if you can!

Which two substances consist of descrete covalent molecules?
Which substance consists of a lattice of oppositely charged ions?

The answers are between:
Diamond, Sulphur, Octane, Lithium Bromide, Graphite or Lead.

Thanks!

[gen2]

Is that the spelling your teacher used?

if so, get yourself a bonus point by pointing out that it is DISCRETE, not 'descrete'.

[Bert]

Octane would consist of discrete covalent molecules. [I don't like the sound of that, to be honest. The bonds between the atoms are covalent. I wouldn't describe the molecule as "covalent".]
Lithium bromide, like sodium chloride, potassium iodide [combine any of the group I elements with any of the group VII elements] are all lattices of oppositely charged ions (when below their melting points, obviously).

[_sophie_]

Thank you SO much! You really are a lifesaver, honestly!