Witch correct word or words compare the properties of a substance before and after it goes through a chemical change.

Find the mass in grams of 1.37x1020 particles of h3po4

If a solution contains 3 moles/liter of sodium chloride (nacl, made of sodium ions and chloride ions), what is the osmolarity of this solution

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as