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.
Combustion Reaction Defined. Chemical reactions are very common. A chemical reaction is any process by which the atoms of one or more substances are rearranged to form different substances.There are numerous types of chemical reactions.ombustion reactions are very common because oxygen readily reacts with many substances. One combustion reaction that has been very important throughout history is the burning of coal.