Chemistry

4. a person's ability to respond physically and mentally to external stimuli.
8. the process of mixing or being mixed.
9. atoms as a source of nuclear energy.
10. a subatomic particle found in the nucleus of every atom.
11. of or denoting a process involving substances in different phases (solid, liquid, or gaseous).
13. the action of purifying a liquid by a process of heating and cooling.
14. a means of solving a problem or dealing with a difficult situation.
15. is the scientific study of the structure of substances and of the way that they react with other substances.
16. a negatively charged subatomic particle.

1. the action or process of filtering something.
2. an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons.
3. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
5. a thing that is composed of two or more separate elements; a mixture.
6. consisting of parts all of the same kind.
7. a subatomic particle found in the nucleus of every atom except that of simple hydrogen.
12. the process of turning from liquid into vapor.