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Review Questions Chapter 1

1. Which of the following does not have constant composition and therefore is not a pure substance?

iron
distilled water
gold
orange juice

2. Which of the following is not a physical property of water?

It freezes at 0° C.
It does not dissolve in gasoline.
It is colorless.
It reacts with iron to form rust.
It dissolves sugar but, when the solution is evaporated, the sugar can be reclaimed.

3. Which of the following pure substances is not a solid at room temperature?

platinum
silver
oxygen
gold
copper

4. Which of the following best illustrates the interconvertibility of matter and energy?

a wood fire
a dynamite explosion
a lead storage battery
a diesel engine
a nuclear explosion

5. Which of the following is not a change from potential energy to kinetic energy?

a ball rolling down a hill
a car driving on a highway
the act of ice skating
an elevator going up
a bullet flying through the air

6. Anlaytical chemists have shown that pure water, regardless of its source, contains 11% hydrogen. This statement is a:

theory
hypothesis
conjecture
fact
guess

7. Which of the following should have the greatest credibility amoung scientists?

hypothesis
law
theory
postulate
premonition

8. Suppose you analyze a sample of pure water from a deep well in Iowa and conclude that it contains 22% hydrogen (see Question 6). Which would be the least sensible thing for you to do?

Analyze another sample.
Check your apparatus.
Ask a friend to analyze the same sample.
Call a press conference to announce you finding.
Check your calculations.

9. Which branch of chemistry would you expect has learned the most about the preparation of substances from coal?

inorganic chemistry
physical chemistry
nuclear chemistry
organic chemistry.
nutritional chemistry

10. A chemist who determines the pollutants in the air in a steel mill is probably:

an organic chemists
an inorganic chemist
a biochemist.
a geochemist.
an analytical chemist

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