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Exam 1: An Introduction to Chemistry

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Question 1

Multiple Choice

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The statement,"An apple a day keeps the doctor away",is best described as a(n)

A) observation
B) law
C) theory
D) hypothesis

E) A) and C)
F) A) and B)

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Question 2

Multiple Choice

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Which is a solution?

A) element
B) compound
C) homogeneous mixture
D) heterogeneous mixture

E) None of the above
F) C) and D)

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Question 3

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Matter is classified into substances and mixtures. Explain how these are different. Substances are either elements or compounds.Describe what these are and give examplesof each. Mixtures can be either heterogeneous or homogeneous.Explain how these are differentand give examples of each. What is a solution? Give examples of solutions.

Which is a pure substance existing as different phases in a heterogeneous system?

Which phase of matter can be compressed or expanded to the greatest degree?

Define solid,liquid,and gas. Explain the differences in the three phases of matter on both the macroscopic and molecular levels.

The majority of the volume of a gas is empty space.

Which is a pure substance?

Which is a pure substance?

Which state of matter consists of particles in regular,repeating,three dimensional geometrical patterns?

Define matter. Explain what is meant by mass and volume. Is everything in nature matter? If not,what else exists?

A liquid has a definite shape and a definite volume.

A mixture of citric acid and water is classified as homogeneous.What can you conclude from this description?

Which phase of matter contains the greatest force of attraction between particles?

"When Jill opened the bottle containing a clear liquid,the whole room smelled likeroses." Based on this statement we can infer that:

Which is a pure substance ?

Air is a substance.

Which state of matter consists of particles held together firmly but not rigidly? These particles are held together by strong attractive forces,are in close contact with one another, But are able to flow by one another.

A well established hypothesis is often called a(n)

Suppose someone brought you an unidentified material.List five questions a chemist might ask in an attempt to identify the material.