Question 1

The appropriate number of significant figures in the result of 15.234 × 15.208 is

Accepted Answer

A)  2. 
B)  3. 
C)  4. 
D)  5. 
E)  6. 
A)  2. 
B)  3. 
C)  4. 
D)  5. 
E)  6.

Question 2

A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." This statement is best described as a

Accepted Answer

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

Question 3

Which of the following is not an SI 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 4

Which of the following correctly expresses 52,030.2 m in scientific notation?

Accepted Answer

A)  5.20302 × 104 m 
B)  5.20302 × 105 m 
C)  5.203 × 104 m 
D)  5.20 × 104 m 
E)  5.2 × 104 m 
A)  5.20302 × 104 m 
B)  5.20302 × 105 m 
C)  5.203 × 104 m 
D)  5.20 × 104 m 
E)  5.2 × 104 m

Question 5

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

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)  13 
A)  13.3568 
B)  13.357 
C)  13.36 
D)  13.4 
E)  13

Question 7

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

Question 8

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 9

During the swing of a frictionless pendulum, what energy form(s) remain constant?

Accepted Answer

A)  kinetic energy only 
B)  potential energy only 
C)  both kinetic energy and potential energy 
D)  kinetic plus potential energy 
E)  None of these choices are correct. 
A)  kinetic energy only 
B)  potential energy only 
C)  both kinetic energy and potential energy 
D)  kinetic plus potential energy 
E)  None of these choices are correct.

Question 10

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

Accepted Answer

A)  38 cm 
B)  24 cm 
C)  18 cm 
D)  9.3 cm 
E)  5.9 cm 
A)  38 cm 
B)  24 cm 
C)  18 cm 
D)  9.3 cm 
E)  5.9 cm

Question 11

The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

Accepted Answer

A)  1.34 × 10-13 m 
B)  1.34 × 10-12 m 
C)  1.34 × 10-10 m 
D)  1.34 × 10-7 m 
E)  1.34 × 10-6 m 
A)  1.34 × 10-13 m 
B)  1.34 × 10-12 m 
C)  1.34 × 10-10 m 
D)  1.34 × 10-7 m 
E)  1.34 × 10-6 m

Question 12

The ripening of fruit, once picked, is an example of physical change.

Accepted Answer

A) True 
 B)False

Question 13

The number 6.0448, rounded to 2 decimal places, becomes 6.05.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is a chemical change?

Accepted Answer

A)  boiling of water 
B)  melting wax 
C)  broiling a steak on a grill 
D)  condensing water vapor into rainfall 
E)  carving a piece of wood 
A)  boiling of water 
B)  melting wax 
C)  broiling a steak on a grill 
D)  condensing water vapor into rainfall 
E)  carving a piece of wood

Question 15

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch?

Accepted Answer

A)  849 lb/in3 
B)  491 lb/in3 
C)  376 lb/in3 
D)  0.491 lb/in3 
E)  1.83 × 10-3 lb/in3 
A)  849 lb/in3 
B)  491 lb/in3 
C)  376 lb/in3 
D)  0.491 lb/in3 
E)  1.83 × 10-3 lb/in3

Question 16

In an average year, the American chemical industry produces more than 9.5 million metric tons of sodium carbonate. Over half of this is used in the manufacture of glass while another third is used in the production of detergents and other chemicals. How many pounds of sodium carbonate are produced annually?

Accepted Answer

A)  2.1 × 1010 lb 
B)  4.3 × 109 lb 
C)  1.1 × 107 lb 
D)  2.2 × 106 lb 
E)  2.1 × 104 lb 
A)  2.1 × 1010 lb 
B)  4.3 × 109 lb 
C)  1.1 × 107 lb 
D)  2.2 × 106 lb 
E)  2.1 × 104 lb

Question 17

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds)? (Assume an exchange rate of $1.00 = £0.545)

Accepted Answer

A)  £1310 
B)  £3510 
C)  £6370 
D)  £10400 
E)  £17100 
A)  £1310 
B)  £3510 
C)  £6370 
D)  £10400 
E)  £17100

Question 18

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?

Accepted Answer

A)  382.0°C 
B)  167.7°C 
C)  153.4°C 
D)  117.9°C 
E)  103.7°C 
A)  382.0°C 
B)  167.7°C 
C)  153.4°C 
D)  117.9°C 
E)  103.7°C

Question 19

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: A 
A)  second: s 
B)  kilogram: kg 
C)  kelvin: K 
D)  mole: m 
E)  ampere: A

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. 
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.

Exam 1: Keys to Studying Chemistry Definitions, Units, and Problem Solving

The appropriate number of significant figures in the result of 15.234 × 15.208 is

Which of the following is not an SI base unit?

Which of the following correctly expresses 52,030.2 m in scientific notation?

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

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

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?

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

During the swing of a frictionless pendulum, what energy form(s) remain constant?

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

The ripening of fruit, once picked, is an example of physical change.

The number 6.0448, rounded to 2 decimal places, becomes 6.05.

Which of the following is a chemical change?

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch?

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds)? (Assume an exchange rate of $1.00 = £0.545)

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?

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

Select the best statement.

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 Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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?

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm³. What is that density in pounds per cubic inch?