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.
A chemical change takes place when chlorophyll breaks down into new. substances. This change is an example of a chemical reaction. A. chemical reaction is a process in which one or more substances. change to make one or more new substances. The chemical and. physical properties of the new substances differ from those of the. original substances. Some results of chemical reactions are shown in.