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.
For those of you who are wondering, what is chemical change, it is a reaction that takes place when chemical bonds are broken due to environmental conditions and new bonds are formed between different atoms. This formation of new chemical bonds leads to a completely different product.or those of you who are wondering, what is chemical change, it is a reaction that takes place when chemical bonds are broken due to environmental conditions and new bonds are formed between different atoms. This formation of new chemical bonds leads to a completely different product.