Capillary Action

Capillary Action is a physical phenomenon of liquids, which is associated with the intermolecular surface forces existing between a solid and a liquid, causing the rise of the liquid in narrow tubes resulting in accumulation of the fluid in the tubes.

Example: When a piece of chalk is dipped in a liquid, the liquid slowly rises in the chalk by capillary action.

Chemisorption

Chemisorption or Chemical Adsorption, involves the formation of strong chemical bonds between adsorbate molecules and specific surface locations known as chemically active sites. In simple terms, Chemisorption can best be explained as accumulation of the adsorbate on a surface via strong chemical bonds.

Example: Animation illustrates the concept.

Hydrogenation

Hydrogenation is the chemical process involving addition of hydrogen to an unsaturated organic compound(compound having double or triple bonds), in the presence of a catalyst. Hydrogenation process results in formation of a saturated organic compound from an unsaturated one.

Example: Hydrogenation of oil.

Exothermic Reactions

Exothermic Reaction is a chemical reaction that releases energy into its surroundings.

Endothermic Reactions

Endothermic Reaction is chemical reaction that absorbs energy from its surroundings.