SAT Subject Test Chemistry

PART 2

REVIEW OF MAJOR TOPICS

CHAPTER 13

Some Representative Groups and Families

HALOGEN FAMILY

The common members of the halogen family are shown in Table 13 with some important facts concerning them.

Because each halogen lacks one electron in its outer principal energy level, these elements usually are acceptors of electrons (oxidizing agents). Fluorine is the most active nonmetal in the periodic chart.

Some Important Halides and Their Uses

Hydrochloric acid

 

—common acid prepared in the laboratory by reacting sodium chloride with concentrated sulfuric acid. It is used in many important industrial processes.

Silver bromide and silver iodide

 

—halides used on photographic film. Light intensity is recorded by developing as black metallic silver those portions of the film upon which the light fell during exposure.

Hydrofluoric acid

 

—acid used to etch glass by reacting with SiO2 to release silicon fluoride gas. Also used to frost lightbulbs.

Fluorides

 

—used in drinking water and toothpaste to reduce tooth decay.