Interpretation:
Three elements that are found in chlorofluorocarbons needs to be determined.
Concept introduction:
An element is a pure substance that cannot be broken down by chemicals. It made completely of one type of atom.

Answer to Problem 27A
Chlorofluorocarbons consist of chlorine, fluorine and carbon.
Explanation of Solution
Chlorofluorocarbon was first synthesized in 1928 by Thomas Midgley, Jr. It is composed of three elements of the periodic table, chlorine, fluorine and carbons. There are several substances that are classified as chlorofluorocarbons or CFCs.
It does not occur naturally, it can only be obtained in laboratory. It is non-toxic and stable since they do not react with other substances.
Chlorofluorocarbons are used as coolants in refrigerators and air-conditioners. They are also used in plastic foams and in spray cans as propellants.
Thus, three elements found in chlorofluorocarbons are chlorine, fluorine and carbon.
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