1						2
												3							4
																	5
								6
7														8
			9
										10
11
12

Across 1. molecules that contain at least one amine group (-NH2) and at least one carboxylic acid group (-COOH) 6. Sharing of more than one electron pair between bonded atoms 7. A complex polymer made by linking together amino acid molecules 9. A class of organic compounds including sugars and starches. The name comes from the fact that many (but not all) have empirical formula CH2O. 11. A notation that indicates the type and number of atoms in a molecule. Ex , C6H12O6 12. An attraction between ions of opposite charge.

Down 2. a very strong attraction between two or more atoms that are sharing their electrons and are represented by a line drawn between the symbols of the bonded atoms. 3. shows which elements are present in a compound, with their mole ratios indicated as subscripts. For example, glucose is CH2O 4. The average distance between the nuclei of two bonded atoms in a stable molecule. 5. Energy change per mole when a bond is broken in the gas phase for a particular substance. 7. a charged particle that contains more than two covalently bound atoms 8. strong attraction between two or more atoms involving electrons which are either shared or transferred between the bonded atoms. 10. A large molecule made by linking smaller molecules ("monomers") together.