Question 1

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. 
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.

Question 2

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

Accepted Answer

A)  10-6 
B)  10-3 
C)  103 
D)  106 
E)  109 
A)  10-6 
B)  10-3 
C)  103 
D)  106 
E)  109

Question 3

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. 
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.

Question 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Question 7

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

Question 8

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

Accepted Answer

A)  meter 
B)  ampere 
C)  second 
D)  gram 
E)  kelvin 
A)  meter 
B)  ampere 
C)  second 
D)  gram 
E)  kelvin

Question 9

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

Question 10

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

Question 11

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/h 
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/h

Question 12

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)  toothpaste 
A)  air 
B)  tap water 
C)  sea water 
D)  water 
E)  toothpaste

Question 13

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)  definition 
A)  theory 
B)  hypothesis 
C)  law 
D)  experiment 
E)  definition

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 m 
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 m

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. 
A)  theory. 
B)  hypothesis. 
C)  law. 
D)  fact. 
E)  postulate.

Question 17

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. 
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.

Question 18

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. 
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.

Question 19

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 20

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

Exam 1: Keys to the Study of Chemistry

Water vapor is less dense than ice because

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

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?

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

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

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.

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?

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

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

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

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

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

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?

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

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

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

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

Select the best statement.

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

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

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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?

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?