Chemistry Review

5. A chemical formula that shows the simplest whole-number ratio of atoms in a compound.
6. A property that depends on the amount of substance present, such as mass or volume.
8. A substance composed of two or more elements in a fixed, definite proportion.
10. A method of separating a solid from a liquid by pouring the mixture through porous paper in a funnel.
12. Matter composed of two or more components in proportions that can vary from one sample to another.
13. Mass The mass of one mole of a given substance.
15. A model for the way nature is that tries to explain not just what nature does, but why.
17. Sub-microscopic particles that serve as the fundamental building blocks of ordinary matter.
19. A positively charged ion formed when an atom loses electrons.
20. How close a series of measurements are to one another, or how reproducible they are.
21. A substance that cannot be physically broken down into simpler substances.

1. Negatively charged subatomic particles that orbit outside the nucleus.
2. The amount of force exerted per unit of area.
3. The ratio of a substance's mass to its volume.
4. The small, dense, positively charged center of an atom.
7. Atoms of the same element that have the same number of protons but different numbers of neutrons.
9. Anything that occupies space and has mass.
11. The unique set of conditions on a phase diagram where all three states of matter coexist.
14. A type of mixture with the same composition throughout because its atoms or molecules mix uniformly.
16. A brief statement that summarizes past observations and predicts future ones.
18. The amount of material containing Avogadro’s number (6.022×1023) of particles.