Question

Hi I need help with this question if anyone can help me, you can find the question in the attached file

By the way I didn't know what kind of science this was....sorry

Answer 1

1) liquid 1 and 4

2) they have the same density so the fact that they have different masses is irrelevant. they also have the same melting point, showing they have the same intermolecular forces/binds suggesting that their structures are the same.