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GED Section 3: Science Questions 76–80 (page: 17)

A compound is composed of atoms from two or more elements that are chemically bonded. Some examples of common compounds are water, alcohol, and sugar.
A compound can be represented in a number of ways. One is the structural diagram, which depicts each atom within a compound and the bonds that join those atoms. Another representation is the molecular formula, a shorthand notation of the elements and numbers of atoms of each element in a single molecule of the compound.

The following structural diagram represents isopropanol, commonly referred to as isopropyl (rubbing) alcohol.
Based on the structural diagram to the left, which molecular formula represents isopropyl alcohol?

As pressure in a closed container is increased, the volume, or amount of space that a gas takes up, decreases. Divers who work underwater use tanks containing oxygen in order to breathe. The amount of oxygen in the tanks allows the divers to stay underwater for some time, yet the tanks are not huge.
Which statement best explains this occurrence?

-- Exhibit --
The pH scale is a measure of the acidity of a substance. The numerical range of the scale is from 0.0 to 14.0. A midpoint pH of 7.0 designates a neutral substance (neither acid nor base). A pH lower than 7.0 denotes an acid substance, whereas a pH higher than 7.0 denotes a basic substance.

-- Exhibit --
Which of the following substances is the MOST basic?

Exhibit:

Based on the graph at the left, in which city would a solar water heating system pay for itself most quickly?

A scientist published his work in a scientific journal, and it generated much excitement in the scientific community. However, when other scientists across the world did the same experiment to try and repeat the results, it proved to be impossible.
When this type of event occurs, which statement describes the most important factor about a scientific finding's acceptance by the scientific community?