Substances whose particles have attraction to each other have lower melting points than substances whose particles have attraction to each other.

weak and strong.

Explanation:

Given that molecules have weak attraction for each other, the solid melts easily when exposed to heat. However, when there are strong intermolecular forces of attraction, it becomes more difficult for the solid to melt hence a higher boiling point.

weak and strong

Explanation: Substances in which weak attraction exist between the particles requires less energy to break the bonds between the particles thereby resulting in lower melting points, but substances in which strong attraction exist between the particles requires more energy to break the bonds between them, thus resulting in higher melting points.

where's the diagram?

he would use the colour black