1 Time-Pathogenic bacteria need enough time in order to multiply. 2  The number of bacteria will reach dangerous levels very quickly in a short period of time in perfect conditions. 3  Keep in mind that bacteria can reproduce every 20 minutes in perfect conditions.
Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes may occur. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.
Post. Share. Reactant Definition: Starting material in a chemical reaction. Examples: H 2 and O 2 are reactants in the reaction H 2 (g) + 1/2 O 2 (g) â H 2 O(l). Return to the Chemistry Glossary Index. By Anne Marie Helmenstine, Ph.D.