CHMA10H3 Chapter Notes - Chapter 6: Thermal Energy, Chemical Energy, Potential Energy

• School: UTSC
• Department: Chemistry
• Course: CHMA10H3
• Professor: Heinz- Bernhard Kraatz

Document Summary

Chemical hand warmer small pouch that comes sealed in a plastic package: package slowly warms up (cid:0) keeps hands/feet warm (placed in gloves/boots) Most commonly available hand warmers use the oxidation of iron as the exothermic reaction: 4 fe(s) + 3 o2(g) (cid:0) 2 fe2o3(s) + heat: the most important product is heat. Heat = defined more carefully later; heat (cid:0) what you feel when you touch something that is warmer than your hand. Thermodynamics | study of heat & its interconversion w/ other types of energy. Thermochemistry | study of heat absorbed/released during chemical reactions and/or physical changes ((cid:0) part of thermodynamics: predicts whether a reaction will proceed spontaneously: Ag+(aq) + na+(aq) + cl-(aq) (cid:0) agcl(s) + na+(aq: predicts the effect of changing conditions. N2o4 predominates @ low temp / no2 @ high temp: predicts whether a reaction will give off / absorb heat. Fe2o3(s) + 2 al(s) (cid:0) fe(s) + al2o3(s)