Chemical Program (image) University of Washington Share Print E-Mail Caption An example of a chemical program. Here, A, B and C are different chemical species. Credit Yan Liang, L2XY2.com Usage Restrictions Photo credit required. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.