Nutrition and Growth of Bacteria (page 4) (This chapter has 6 pages) Â© Kenneth Todar, PhD Physical and Environmental Requirements for Microbial Growth The procaryotes exist in nature under an enormous range of physical conditions such as O2 concentration, Hydrogen ion concentration (pH) and temperature.
In a double replacement reaction parts of two compounds switch places to form two new compounds. Two reactants yield two products. For example when silver nitrate combines with sodium chloride, two new compounds--silver chloride and sodium nitrate are formed because the sodium and silver switched places.
Reactants vs Products. A reaction is a process of converting a set of substances into another set of substances. The substances at the beginning are known as reactants, and the substances after the reaction are known as products.roducts. Products are the new substances formed after a reaction. They are formed by the reaction between reactants, and they have different characteristics than reactants. Products may have a lower energy or higher energy than the reactants.