LIFE SCIENCE

Detailed explanation-1: -It is the polarity of the water molecules that makes it a liquid at room temperature. The water molecules is dipolar because of the great difference in the polarities oxygen and hydrogen.

Detailed explanation-2: -Water and methane are both small molecules with atoms linked by single covalent bonds. However water molecules are polar and can form hydrogen bonds, whereas methane molecules are nonpolar and do not form hydrogen bonds. As a result their physical properties are very different.

Detailed explanation-3: -The property of cohesion describes the ability of water molecules to be attracted to other water molecules, which allows water to be a “sticky” liquid. Hydrogen bonds are attractions of electrostatic force caused by the difference in charge between slightly positive hydrogen ions and other, slightly negative ions.