CHEM 112 Chapter Notes - Chapter 7: Collision Frequency, Exothermic Reaction, Endothermic Process
Document Summary
Thermochemistry - the study of the changes in heat energy that accompany chemical reactions and physical changes. 2: heat cannot be measured directly, but is measured by temperature changes when heat is transferred. Boiling and condensation: molar heat of vaporization q. T = change in temperature (in celsius or kelvin) Problem: the molar heat of fusion of water is 6. 009 kj/mol. H2o (g: entropy and reaction tendency, there is a tendency for the disorder of the system to increase. The two principals of collision theory: particles must collide while favorably oriented, particles must collide with enough energy to disrupt the bonds of the molecules. An increase in pressure causes the equilibrium position to shift to the right, where there are only two moles of gas. The left side has four moles of gas: decreases in pressure cause the reaction to shift in the direction that increases collisions; toward the side with more moles of gas.
