Question 1

The SI prefix mega- (M)  means

Accepted Answer

A)   10-6.
B)   10-3.
C)   103.
D)   106.
E)   109.F) C) and E)
G) C) and D)

Question 2

Which of the following abbreviations of the given SI base unit is incorrect?

Accepted Answer

A)   second: s
B)   kilogram: kg
C)   kelvin: K
D)   mole: m
E)   ampere: AF) C) and E)
G) None of the above

Question 3

The most significant contribution to modern science made by alchemists was

Accepted Answer

A)   their fundamental work in the transmutation of the elements.
B)   their widespread acceptance of observation and experimentation.
C)   their systematic method of naming substances.
D)   their understanding of the nature of chemical reactions.
E)   their discovery of phlogiston.F) A) and D)
G) A) and E)

Question 4

The potential energy of a car moving on a level road does not depend on its speed.

Accepted Answer

A) True 
 B)False

Question 5

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Accepted Answer

A)   theory
B)   hypothesis
C)   law
D)   experiment
E)   definitionF) A) and D)
G) B) and E) B

Question 6

Select the answer that expresses the result of this calculation with the correct number of significant figures.

Accepted Answer

A)   13.3568
B)   13.357
C)   13.36
D)   13.4
E)   13F) C) and D)
G) All of the above

Question 7

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which
a. the numerical value is the same on both scales.
b. the Fahrenheit number is exactly twice the Celsius number.

Accepted Answer

a. 40.°F =...

Question 8

At a pressure of one billionth (10-9)  of atmospheric pressure, there are about 2.7 × 1010 molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Accepted Answer

A)   2.7 × 1016
B)   2.7 × 1014
C)   2.7 × 1012
D)   2.7 × 108
E)   2.7 × 104F) C) and D)
G) B) and E)

Question 9

A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its

Accepted Answer

A)   accuracy.
B)   precision.
C)   systematic error.
D)   determinate error.
E)   human error.F) B) and D)
G) C) and D)

Question 10

The symbol for the SI base unit of mass is

Accepted Answer

A)   mg.
B)   g.
C)   kg.
D)   metric ton.
E)   lb.F) A) and C)
G) A) and B)

Question 11

Which one of the following numbers contains a digit or digits which is/are not significant?

Accepted Answer

A)   970.0
B)   502
C)   .300
D)   .0043
E)   20.01F) C) and E)
G) A) and D)

Question 12

The SI unit of speed (velocity)  is

Accepted Answer

A)   km/h.
B)   km/s.
C)   m/h.
D)   m/s.
E)   none of the above.F) A) and C)
G) B) and E)

Question 13

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3) . What is the density of talc?

Accepted Answer

A)   4.61 g/cm3
B)   2.82 g/cm3
C)   2.63 g/cm3
D)   2.44 g/cm3
E)   1.61 g/cm3F) D) and E)
G) C) and D)

Question 14

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Accepted Answer

A hypothesis should be capable...

Question 15

Which of the following is an extensive property of oxygen?

Accepted Answer

A)   boiling point
B)   temperature
C)   average kinetic energy of molecules
D)   density
E)   massF) A) and B)
G) A) and C)

Question 16

Select the best statement.

Accepted Answer

A)   Physical changes may be reversed by changing the temperature.
B)   Physical changes alter the composition of the substances involved.
C)   Physical properties are not valid characteristics for identifying a substance.
D)   Physical properties are mostly extensive in nature.
E)   Physical changes are usually accompanied by chemical changes.F) D) and E)
G) A) and D)

Question 17

Which one of the following is a "substance" in the sense of the word as used in your textbook?

Accepted Answer

A)   air
B)   tap water
C)   sea water
D)   water
E)   toothpasteF) A) and B)
G) C) and D)

Question 18

Give an example of a physical property and a chemical property of each of the following:
a. oxygen gas
b. octane
c. copper

Accepted Answer

Answers could all be the same, but some possibilities are:
a. boiling point, reaction with sodium
b. boiling point, reaction with oxygen
c. electrical conductivity, reaction with nitric acid

Question 19

Water vapor is less dense than ice because

Accepted Answer

A)   molecules in the gas phase are in constant motion.
B)   molecules in the gas phase have more potential energy than in solids.
C)   molecules in the gas phase have more kinetic energy than in solids.
D)   gaseous molecules have less mass.
E)   molecules in the gas phase have more space between them than in solids.F) A) and E)
G) A) and C) E

Question 20

When applying the scientific method, it is important to avoid any form of hypothesis.

Accepted Answer

A) True 
 B)False

Exam 1: Keys to the Study of Chemistry

The SI prefix mega- (M) means

Correct AnswerverifiedShow Answer

Which of the following abbreviations of the given SI base unit is incorrect?

Correct AnswerverifiedShow Answer

The most significant contribution to modern science made by alchemists was

Correct AnswerverifiedShow Answer

The potential energy of a car moving on a level road does not depend on its speed.

Correct AnswerverifiedShow Answer

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Correct AnswerverifiedB

Select the answer that expresses the result of this calculation with the correct number of significant figures.

Correct AnswerverifiedShow Answer

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which a. the numerical value is the same on both scales. b. the Fahrenheit number is exactly twice the Celsius number.

Correct Answerverifieda. 40.°F =...View AnswerShow Answer

At a pressure of one billionth (10-9) of atmospheric pressure, there are about 2.7 × 1010 molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Correct AnswerverifiedShow Answer

A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its

Correct AnswerverifiedShow Answer

The symbol for the SI base unit of mass is

Correct AnswerverifiedShow Answer

Which one of the following numbers contains a digit or digits which is/are not significant?

Correct AnswerverifiedShow Answer

The SI unit of speed (velocity) is

Correct AnswerverifiedShow Answer

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3) . What is the density of talc?

Correct AnswerverifiedShow Answer

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Correct AnswerverifiedA hypothesis should be capable...View AnswerShow Answer

Which of the following is an extensive property of oxygen?

Correct AnswerverifiedShow Answer

Select the best statement.

Correct AnswerverifiedShow Answer

Which one of the following is a "substance" in the sense of the word as used in your textbook?

Correct AnswerverifiedShow Answer

Give an example of a physical property and a chemical property of each of the following: a. oxygen gas b. octane c. copper

Correct AnswerverifiedAnswers could all be the same, but some possibilities are: a. boiling point, reaction with sodium b. boiling point, reaction with oxygen c. electrical conductivity, reaction with nitric acid

Water vapor is less dense than ice because

Correct AnswerverifiedE

When applying the scientific method, it is important to avoid any form of hypothesis.

Correct AnswerverifiedShow Answer

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B

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a. 40.°F =...
View Answer

At a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7 × 10¹⁰ molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Correct Answer
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Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³) . What is the density of talc?

Correct Answer
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Correct Answer
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A hypothesis should be capable...
View Answer

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Answers could all be the same, but some possibilities are: a. boiling point, reaction with sodium b. boiling point, reaction with oxygen c. electrical conductivity, reaction with nitric acid

Correct Answer
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E

Correct Answer
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