Does a particle of a liquid or particle of a gas have more kinetic energy

Liquid because it's always moving somehow, so the particles have more kinetic energy

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

satellites are frequently used to make observations of the orbit on earth