Some matters are gases, some liquids and some are solids. Physical properties such as boiling point, melting point, solubility...etc of different materials varies. As a chemist 1. Discuss and explain the possible root cause of these differences. 2. Compare the boiling point of water with hydride of sulfur and comment on huge difference in boiling points of these two hydrides (compounds of hydrogen, here H2O and H2S) from the same group.