QUESTION: 77

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?

Oxygen has to be in small metal tanks so that divers don't sink.
Oxygen takes up only a small amount of the air that we breathe.
If the tanks are small, the fish will not be frightened by the divers.
Since the oxygen is under pressure, a large amount of oxygen can be placed in these small tanks.
Most divers don't stay underwater for a very long time because they get very cold quickly.

Answer(s): D

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QUESTION: 78

-- 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?

tomato juice (pH = 4.2)
black coffee (pH = 5.0)
pure water (pH = 7.0)
human blood (pH = 7.4)
sodium carbonate (pH = 12.5)

Answer(s): E

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QUESTION: 79

Exhibit:

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

Answer(s): D

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QUESTION: 80

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?

presented by a team of scientists
reproducible by other scientists
of considerable practical value
published in a scientific journal
based on an important concept

Answer(s): B

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QUESTION: 80