Across
- 3. A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
- 5. The mass of an atom expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.
- 6. A table of the chemical elements arranged in order of atomic number.
- 7. Precipitation is the formation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid.
- 10. The degree or intensity of heat present in a substance or object.
- 12. A substance made by mixing other substances together.
- 13. A substance that takes part in and undergoes change during a reaction.
Down
- 1. A minute portion of matter.
- 2. A measure, quantity, or frequency, typically one measured against some other quantity or measure.
- 4. An apparent displacement or difference in the apparent position of an object viewed along two different lines of sight.
- 8. A substance produced during a natural, chemical, or manufacturing process.
- 9. The condition of being protected from or unlikely to cause danger, risk, or injury.
- 11. The continuous physical force exerted on or against an object by something in contact with it.