CHEM 1A03 Chapter Notes - Chapter 7: Closed System, Isolated System, State Function

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: Gillian Goward

Document Summary

Combustion is an exothermic reaction between a fuel and an oxidant: rapid combustion: produces heat or both heat and light in the form of either a glow or flames, slow combustion: takes place at low temperatures. This heat is stored between the bonds. Ultimately all the energy to get these high energy molecules comes from sun: sun gives off energy in the form of photons plants take this energy in an. Endothermic reaction to do photosynthesis to produce glucose and oxygen: plants are the most efficient solar cells leaves are the cheapest solar cells, energy is extracted by combustion of the plant material. Therefore, the forward process is endothermic h> 0 (because heat is consumed) and the reverse reaction is exothermic, h<0 (because heat is given off). Burning leaves does not generate energy because it is consumed by water in the leaves, while things like oil, water is removed and they are much more efficient.