Appendix 1: H 2 O Models for Identifying the Results of Symmetry Operation Products

The following page contains eight images of H2O set out in pairs, either side of the vertical line. You should cut out each pair so that you keep the label above each set with it, as indicated by the dotted lines. Then fold each strip of paper along the vertical line and glue the two sides together using paper adhesive. Additional copies of these model templates can be obtained from the Web site associated with this book. Each model is viewed from the side on which the label can be read correctly. On this side the middle of each atom has a small white circle, pierce a small hole through the middle of the circle on the oxygen atom and then insert a burnt match so that the burnt end is away from the paper. This match represents the x-vector on the atom and the burnt end represents its direction. You should insert the matches so that: