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.
A reaction has two components with the reactant as an ingredient,  and the product is the end result. A combustion reaction as the  reactants of O2 (oxygen) and CH4 (metha â¦ ne). Their product through  the reaction CH4 + 2O2 is 2H2 (water) and C02 (carbon dioxide). The substances that are initially present and consumed in a chemical reaction are called reactants and the substance which is formed at the end of the reaction is called â¦ products.. 2 people found this useful.