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.
Chapter 14 - Chemical Reactions. Section 1 - Forming New Substances. Chemical Reaction - the process by which one. or more substances undergo change to produce. one or more different substances. The new substances have new physical and. chemical properties. A chemical reaction is when chemical bonds are. broken, atoms rearrange and new chemical bonds. are formed.