Can someone plss help me answer those 4 questions by tonight. Thank you !

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures