Is a two or more elements chemically combined in a fixed ratio.

A compound

Explanation:

A compound is chemical entity that is formed when 2 or more elements are joined together in a fixed ratio.

This fixed ratio is simply the numerical values of the numbers of these elements. Take for example in the case of water, one atom of oxygen joins together with two atoms of hydrogen. The fixed ratio here is 1 to 2 or 2 to 1 depending on the reference element.

For example also in methane. The molecular formula of Methane is CH4. The ratio between carbon and hydrogen is 1 to 4 here

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

particle   p is an electron and particle q is a neutron