Question 1

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

Accepted Answer

A)   65,500 mi/h
B)   25,300 mi/h
C)   18,200 mi/h
D)   1,090 mi/h
E)   5.02 * 10-3 mi/hF) None of the above
G) A) and E)

Question 2

The S.I. prefix mega- (M)  means :

Accepted Answer

A)   10-6
B)   10-3
C)   103
D)   106
E)   109F) None of the above
G) B) and C)

Question 3

The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the ___________ of the student's result.

Accepted Answer

A)   accuracy
B)   precision
C)   random error
D)   systematic error
E)   indeterminate errorF) A) and E)
G) A) and D)

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

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm3, 4.67 g/cm3, 4.69 g/cm3, and 4.81 g/cm3. Independent studies found the correct density to be 4.75 g/cm3. Which of the following statements represents the best analysis of the data?

Accepted Answer

A)   Bud's results have much greater accuracy than precision.
B)   Bud's results have much greater precision than accuracy.
C)   Bud's results have high accuracy and high precision.
D)   Bud's results have low accuracy and low precision.
E)   Bud's equipment is faulty.F) C) and E)
G) B) and C)

Question 6

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) B) and E)
G) None of the above

Question 7

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

The average distance from Earth to the Sun is 150 megameters. What is that distance in meters?

Accepted Answer

A)   1.5 * 108 m
B)   1.5 * 106 m
C)   1.5*105 m
D)   1.5 * 103 m
E)   1.5 *10-6 mF) A) and D)
G) C) and E)

Question 10

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 E)
G) B) and D)

Question 11

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) B) and D)
G) A) and D)

Question 12

Which of the following is not an S.I. base unit?

Accepted Answer

A)   meter
B)   ampere
C)   second
D)   gram
E)   kelvinF) A) and C)
G) All of the above

Question 13

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

Accepted Answer

A)   6.1* 105 km
B)   5.3 * 105 km
C)   3.9 * l05 km
D)   1.5 * 105 km
E)   9.4 * 104 kmF) A) and E)
G) A) and D)

Question 14

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

Accepted Answer

A) True 
 B)False

Question 15

You prepare 1000. mL of tea and transfer it to a 1.00 quart pitcher for storage. Which of the following statements is true?

Accepted Answer

A)   The pitcher will be filled to 100% of its capacity with no tea spilled.
B)   The pitcher will be filled to about 95% of its capacity.
C)   The pitcher will be filled to about 50% of its capacity.
D)   The pitcher will be completely filled and a small amount of tea will overflow.
E)   The pitcher will be completely filled and most of the tea will overflow.F) A) and D)
G) A) and E)

Question 16

A detailed explanation of natural phenomena that is generally accepted and has been extensively tested is called a

Accepted Answer

A)   theory.
B)   hypothesis.
C)   law.
D)   fact.
E)   postulate.F) A) and E)
G) None of the above

Question 17

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

Accepted Answer

A) True 
 B)False

Question 18

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 B)
G) A) and C)

Question 19

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

Accepted Answer

A)   269.01860 cm
B)   269.0186 cm
C)   269.019 cm
D)   269.02 cm
E)   269.0 cmF) A) and D)
G) B) and E)

Question 20

Select the best statement.

Accepted Answer

A)   Chemical changes provide the only valid basis for identification of a substance.
B)   Chemical changes are easily reversed by altering the temperature of the system.
C)   Chemical changes always produce substances different from the starting materials.
D)   Chemical changes are associated primarily with extensive properties.
E)   Chemical changes are accompanied by changes in the total mass of the substances involved.F) A) and B)
G) A) and C)

Exam 1: Keys to the Study of Chemistry

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

Select the best statement.

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

Correct AnswerverifiedShow Answer

You prepare 1000. mL of tea and transfer it to a 1.00 quart pitcher for storage. Which of the following statements is true?

Correct AnswerverifiedShow Answer

A detailed explanation of natural phenomena that is generally accepted and has been extensively tested is called a

Correct AnswerverifiedShow Answer

The S.I. prefix mega- (M) means :

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The average distance from Earth to the Sun is 150 megameters. What is that distance in meters?

Correct AnswerverifiedShow Answer

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

Correct AnswerverifiedShow Answer

Water vapor is less dense than ice because

Correct AnswerverifiedShow Answer

The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the ___________ of the student's result.

Correct AnswerverifiedShow Answer

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

Correct AnswerverifiedShow Answer

Which of the following is not an S.I. base unit?

Correct AnswerverifiedShow Answer

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

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 AnswerverifiedShow Answer

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm3, 4.67 g/cm3, 4.69 g/cm3, and 4.81 g/cm3. Independent studies found the correct density to be 4.75 g/cm3. Which of the following statements represents the best analysis of the data?

Correct AnswerverifiedShow Answer

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

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 Answer
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verified

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm³, 4.67 g/cm³, 4.69 g/cm³, and 4.81 g/cm³. Independent studies found the correct density to be 4.75 g/cm³. Which of the following statements represents the best analysis of the data?

Correct Answer
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Correct Answer
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