Table 20-8 Source: U.S. Bureau of Census

question 417

Multiple Choice

Table 20-8 Source: U.S. Bureau of Census
-Refer to Table 20-8. In 2011, the bottom 40% of families has

• A)about 13% of total income in the U.S.
• B)about 28% of total income in the U.S.
• C)about 51% of total income in the U.S.
• D)about 72% of total income in the U.S.

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Definitions:

Increasing Reactivity

A term describing a sequence or condition in which the tendency of a substance to undergo a chemical reaction becomes greater.

Styrene

An organic compound with the chemical formula C8H8, a monomer used in the production of polystyrene plastics and synthetic rubber.

π Electrons

Electrons present in the pi bonds of a molecule which contribute to the molecule's chemical properties.

Aromatic

Refers to a class of compounds that contain a benzene ring or a similar structure with delocalized electrons that follow Huckel's rule.