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Exam 1: Chemistry: the Central Science

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Question 1

Multiple Choice

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A ________ mixture has a uniform composition throughout.

A) heterogeneous
B) homologous
C) homogeneous
D) heterologous

E) All of the above
F) C) and D)

Correct Answer

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C

Question 2

Multiple Choice

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Which of the following is not an SI base unit?

A) Meter
B) Ampere
C) Second
D) Gram
E) Kelvin

F) B) and D)
G) A) and C)

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Question 3

True/False

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Boiling point and melting point are extensive properties.

The volume of a substance is an intensive property.

What is a combination of two or more substances in which the substances retain their distinct identities?

The mask of an empty flask is 17.4916 g, and its mass when filled with water at 20.0°C (density = 0.9982 g/mL) is 43.9616 g. The density of "heavy water" at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at 20.0°C?

A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)

What is a substance composed of atoms of two or more elements chemically united in fixed proportions?

How many significant figures does the sum 8.5201 + 1.93 contain?

If two numbers are multiplied together, one which has 3 significant figures and the other which has 4 significant figures, explain how to round the answer.

What is a substance that cannot be separated into simpler substances by chemical means?

Zero kelvin 0 K < 0°F < 0°C.

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

Which one of these represents a chemical change?

Explain the rule for significant figures for addition and subtraction.

What is the equation used to calculate the mass from the density?

A(n)________ is a combination of two or more substances in which the substances retain their distinct identities.

Identify this process as a physical or chemical change: Bacteria convert milk to yogurt.