- chemistry review -

2. a substance that takes part in and undergoes change during a reaction.
4. the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
7. the ability to be dissolved, especially in water.
11. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.
12. of the same kind; alike.
15. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
16. the minor component in a solution,dissolved in the solvent.
17. make (a liquid) thinner or weaker by adding water or another solvent to it.

1. diverse in character or content.
3. wholly directed to one thing; intense.
5. a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.
6. a means of solving a problem or dealing with a difficult situation.
8. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
9. having assets in excess of liabilities; able to pay one's debts.
10. the lowest part or edge of something, especially the part on which it rests or is supported.
13. a substance made by mixing other substances together.
14. a thing that is composed of two or more separate elements; a mixture.
18. a part or aspect of something abstract, especially one that is essential or characteristic.