1									2						3
		4						5
													6							7
8
			9	10						11			12
	13						14
												15
				16
	17
									18
19
	20

Across 4. Process that changes one set of chemicals into another set of chemicals. 6. Weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH. 8. Measurement system used to indicate the concentration of hydrogen (H+) ions in solution. (Ranges from 0-14) 9. Compound that forms hydrogen (H+) ions in solution. 12. Attraction between molecules of different substances. 14. Atom that has a positive or negative charge. 16. Energy needed to get a reaction started. 17. Attraction between molecules of the same substance. 18. Element or compound that enters into a chemical reaction. 19. Negatively charged particle, located outside the nucleus. 20. Element or compound produced by a chemical reaction.

Down 1. The center of an atom. 2. Negatively charged particle, located outside the nucleus. 3. A slight attraction that develops between the oppositely charged regions of nearby molecules. 5. Basic unit of matter. 6. Compound that produces hydroxide (OH-) ions in solution. 7. Substance formed by the chemical combination of two or more elements in definite proportions. 10. Bond formed by the sharing of electrons between atoms. 11. Atom of an element that has a number of neutrons different from that of other atoms of the same element. 13. Smallest unit of most compounds. 15. Bond formed when one or more electrons are transferred from one atom to another.