A panic attack is an exaggeration of your bodyâs normal response to fear, stress or excitement. It is the rapid build-up of overwhelming physical sensations, such as: 1  a pounding heartbeat. 2  feeling faint. 3  sweating. 4  nausea (feeling sick).
Since four elements must be present for the combustion process to occur (fuel, heat, an oxidizing agent, and a chemical chain reaction), a fire can be extinguished by removing any one of these four elements.
Examples of combustion reactions include: 2 H2 + O2 â 2H2O + heat. CH4 + 2 O2 â CO2 + 2 H2O + heat. Other examples include lighting a match or a burning campfire. To recognize a combustion reaction, look for oxygen in the reactant side of the equation and the release of heat on the product side.