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.
  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..eactants are the substances used in a chemical reaction, usually on the left side of the reaction arrow. The products are the things that are made after the reacton is comple â¦ te. 7 people found this useful.