A conversion disorder is a relatively uncommon mental disorder in which a person has physical symptoms that no medical condition, physical examination or testing can explain. The person is not faking.. The symptoms do not appear to be under the person's conscious control and they can cause significant distress.
The most important chemical reaction of all is photosynthesis. At first I thought that the most important reaction was respiration, the set of reactions in our cells that keeps us alive by combining glucose with oxygen and provides the energy that keeps us alive. Then I realized that we would not be alive without the oxygen in the first place.
One of the most important types of reactions studied using calorimetry is combustion. (For more information, see Section 3.2) A compound, usually an organic compound, is allowed to react completely with excess oxygen. Equation 5.15 is an example of such a reaction. Combustion reactions are most conveniently studied using a bomb calorimeter, a device shown schematically in Figure 5.16. The substance to be studied is placed in a small cup within a sealed vessel called a bomb.