. . . . "The world of chemistry. Program 13, The driving forces ; Program 14, Molecules in action"@en . . . . . . . . . . . . "Pt. 13. Explains why chemical reactions occur and what governs the rate of these reactions. Investigates endothermic and exothermic reactions and reveals the role of entropy. -- Pt. 14. Looks at molecules during chemical reactions and the role that catalysts play in chemical transformation."@en . . . . . "Driving forces"@en . . . . . . . .