Question 1

When a wooden match burns in air, chemical potential energy is converted to kinetic energy.

Accepted Answer

A) True 
 B)False

Question 2

Classify the following properties of hydrogen gas as either intensive or extensive.
a. the mass of the gas sample
b. the average speed of a molecule in the sample
c. temperature
d. density
e. number of molecules present

Accepted Answer

a. E
b. I

Question 3

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 4

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 5

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 6

Which measurement is expressed to 4 significant figures?

Accepted Answer

A)  0.423 kg 
B)  24.049 cm 
C)  1300 K 
D)  82,306 m 
E)  62.40 g 
A)  0.423 kg 
B)  24.049 cm 
C)  1300 K 
D)  82,306 m 
E)  62.40 g

Question 7

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm2 =

Accepted Answer

A)  105.2 g/cm3 
B)  105.2 g/cm2 
C)  105.2 g/cm 
D)  72.13 g/cm2 
E)  72.13 g/cm 
A)  105.2 g/cm3 
B)  105.2 g/cm2 
C)  105.2 g/cm 
D)  72.13 g/cm2 
E)  72.13 g/cm

Question 8

Write the following numbers and results in scientific notation, with appropriate significant figures.
a. 654
b. 1234560
c. 0.000000673
d. 0.002590
e. 200.4
f. 260.0
g. F1F1F1S1F1F1F10r2, where r = 8.7 cm
h. 23.24 + 18.6 - 5

Accepted Answer

a. 6.54 × 10² b. 1.23456 × 10⁶ c

Question 9

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®, boils at 56.1°C. What is the boiling point in degrees Fahrenheit?

Accepted Answer

A)  159°F 
B)  133°F 
C)  101°F 
D)  69.0°F 
E)  43.4°F 
A)  159°F 
B)  133°F 
C)  101°F 
D)  69.0°F 
E)  43.4°F

Question 10

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 11

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 12

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 13

The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.

Accepted Answer

A) True 
 B)False

Question 14

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 15

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 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

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

Accepted Answer

A)  387.6 K 
B)  355.6 K 
C)  323.6 K 
D)  190.8 K 
E)  -190.8 K 
A)  387.6 K 
B)  355.6 K 
C)  323.6 K 
D)  190.8 K 
E)  -190.8 K

Exam 1: Keys to the Study of Chemistry

When a wooden match burns in air, chemical potential energy is converted to kinetic energy.

Classify the following properties of hydrogen gas as either intensive or extensive. a. the mass of the gas sample b. the average speed of a molecule in the sample c. temperature d. density e. number of molecules present

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

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

Which of the following is not an SI base unit?

Which measurement is expressed to 4 significant figures?

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm2 =

Write the following numbers and results in scientific notation, with appropriate significant figures. a. 654 b. 1234560 c. 0.000000673 d. 0.002590 e. 200.4 f. 260.0 g. r2, where r = 8.7 cm h. 23.24 + 18.6 - 5

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®, boils at 56.1°C. What is the boiling point in degrees Fahrenheit?

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.

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?

Which of the following is a chemical change?

The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.

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

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)

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

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

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

The Components of Matter

Stoichiometry of Formulas and Equations

The 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: Bonding, Structure, and Reactivity

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

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm² =

Write the following numbers and results in scientific notation, with appropriate significant figures. a. 654 b. 1234560 c. 0.000000673 d. 0.002590 e. 200.4 f. 260.0 g. r², where r = 8.7 cm h. 23.24 + 18.6 - 5

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas^®, boils at 56.1°C. What is the boiling point in degrees Fahrenheit?

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?