Question 1

Which of the following is the most massive?

Accepted Answer

A) 2.5 kg of oxygen gas 
B) 0.25 kg of iron 
C) 2.5 g of sodium chloride (table salt) 
D) 250 g of helium gas 
E) 250 mg of aluminum 
A) 2.5 kg of oxygen gas 
B) 0.25 kg of iron 
C) 2.5 g of sodium chloride (table salt) 
D) 250 g of helium gas 
E) 250 mg of aluminum A

Question 2

Which of the following is an element?

Accepted Answer

A) Cl2 
B) H2O 
C) NaCl 
D) MgO 
E) HCl 
A) Cl2 
B) H2O 
C) NaCl 
D) MgO 
E) HCl A

Question 3

Which one of the following is not a chemical reaction?

Accepted Answer

A) dynamite exploding 
B) iron rusting 
C) wood burning 
D) water turning to steam 
E) eggs cooking 
A) dynamite exploding 
B) iron rusting 
C) wood burning 
D) water turning to steam 
E) eggs cooking D

Question 4

Which one of the following statements is not correct?

Accepted Answer

A) Helium is an element. 
B) Table salt (sodium chloride) is a compound. 
C) Water is a pure substance. 
D) Air is a solution. 
E) Elements occur only in the form of individual atoms. 
A) Helium is an element. 
B) Table salt (sodium chloride) is a compound. 
C) Water is a pure substance. 
D) Air is a solution. 
E) Elements occur only in the form of individual atoms.

Question 5

Which represents an intensive property?

Accepted Answer

A) Hydrogen gas has mass. 
B) Hydrogen gas has a given density. 
C) A balloon filled with hydrogen gas has a given volume. 
D) Hydrogen releases a given amount of energy when it reacts with oxygen. 
E) Hydrogen gas in a steel tank exerts a given pressure. 
A) Hydrogen gas has mass. 
B) Hydrogen gas has a given density. 
C) A balloon filled with hydrogen gas has a given volume. 
D) Hydrogen releases a given amount of energy when it reacts with oxygen. 
E) Hydrogen gas in a steel tank exerts a given pressure.

Question 6

An element ________

Accepted Answer

A) can be separated into its components by physical methods. 
B) may have different chemical properties depending on its source. 
C) cannot be separated into simpler substances by chemical methods. 
D) can also be a compound. 
E) exists only as an atom and not as a molecule. 
A) can be separated into its components by physical methods. 
B) may have different chemical properties depending on its source. 
C) cannot be separated into simpler substances by chemical methods. 
D) can also be a compound. 
E) exists only as an atom and not as a molecule.

Question 7

Molecules are represented in various ways. Which statement A-D about molecular representations is not correct.

Accepted Answer

A) A molecular or chemical formula identifies the elements and the number of atoms of each that comprise a molecule of a compound. 
B) A structural formula shows how the atoms are bonded together but does not necessarily indicate the bond angles or three-dimensional shape of the molecule. 
C) A ball-and-stick model shows bond angles and the three-dimensional shape of a molecule. 
D) A space-filling model best represents the size of the atoms and distribution of electrons in a molecule. 
E) Statements A-D all are correct. 
A) A molecular or chemical formula identifies the elements and the number of atoms of each that comprise a molecule of a compound. 
B) A structural formula shows how the atoms are bonded together but does not necessarily indicate the bond angles or three-dimensional shape of the molecule. 
C) A ball-and-stick model shows bond angles and the three-dimensional shape of a molecule. 
D) A space-filling model best represents the size of the atoms and distribution of electrons in a molecule. 
E) Statements A-D all are correct.

Question 8

Which of the following does not represent a physical property of caffeine?

Accepted Answer

A) Caffeine melts at 238   C. 
B) Caffeine dissolves in water. 
C) Caffeine has a density of 1.23 g/mL. 
D) In the body, caffeine reacts with adenosine receptors in the central nervous system. 
E) Caffeine is a white powder. 
A) Caffeine melts at 238   C. 
B) Caffeine dissolves in water. 
C) Caffeine has a density of 1.23 g/mL. 
D) In the body, caffeine reacts with adenosine receptors in the central nervous system. 
E) Caffeine is a white powder.

Question 9

The following measurements of the mass of an aspirin tablet were made by different students in a lab. Which set is the most precise?

Accepted Answer

A) 1.513 g, 1.503 g, 1.522 g 
B) 1.513 g, 1.511 g, 1.450 g 
C) 1.513 g, 1.459 g, 1.533 g 
D) 1.513 g, 1.517 g, 1.512 g 
E) 1.513 g, 1.510 g, 1.523 g 
A) 1.513 g, 1.503 g, 1.522 g 
B) 1.513 g, 1.511 g, 1.450 g 
C) 1.513 g, 1.459 g, 1.533 g 
D) 1.513 g, 1.517 g, 1.512 g 
E) 1.513 g, 1.510 g, 1.523 g

Question 10

Which one of the following statements is not correct?

Accepted Answer

A) Sodium and chlorine are elements. 
B) Sodium chloride (table salt) is a compound. 
C) Sodium chloride is a pure substance. 
D) Sodium chloride is a heterogeneous mixture. 
E) Sodium chloride added to water forms a solution. 
A) Sodium and chlorine are elements. 
B) Sodium chloride (table salt) is a compound. 
C) Sodium chloride is a pure substance. 
D) Sodium chloride is a heterogeneous mixture. 
E) Sodium chloride added to water forms a solution.

Question 11

A solid forming a liquid is called ________

Accepted Answer

A) sublimation. 
B) deposition. 
C) melting. 
D) freezing. 
E) vaporization. 
A) sublimation. 
B) deposition. 
C) melting. 
D) freezing. 
E) vaporization.

Question 12

In celebration of Mole Day, Turbo the snail competed in a race that was a mole (6.02   1023) of zeptometers long. If zepto represents a factor of 10-21, how long was the race in meters?

Accepted Answer

A) 1.66   10-3 m 
B) 1.66   10-4 m 
C) 60.2 m 
D) 6.02   102 m 
E) 6.02   103 m 
A) 1.66   10-3 m 
B) 1.66   10-4 m 
C) 60.2 m 
D) 6.02   102 m 
E) 6.02   103 m

Question 13

Which one of the following is not classified correctly?

Accepted Answer

A) Distilled water is a compound. 
B) Gold is an element. 
C) Air is a solution. 
D) Table salt (sodium chloride) is a mixture. 
E) Salad dressing is a suspension. 
A) Distilled water is a compound. 
B) Gold is an element. 
C) Air is a solution. 
D) Table salt (sodium chloride) is a mixture. 
E) Salad dressing is a suspension.

Question 14

John Dalton postulated that all matter is composed of small particles called atoms. For this proposition to be considered a valid scientific theory, ________

Accepted Answer

A) it must be supported by experimental evidence and testing. 
B) it must be impossible to prove wrong by experiment. 
C) all possible experiments must never find an exception to it. 
D) some, but only a few, experiments may find exceptions to it. 
E) it must be voted on by the scientific community and accepted by all. 
A) it must be supported by experimental evidence and testing. 
B) it must be impossible to prove wrong by experiment. 
C) all possible experiments must never find an exception to it. 
D) some, but only a few, experiments may find exceptions to it. 
E) it must be voted on by the scientific community and accepted by all.

Question 15

Extensive properties are ________

Accepted Answer

A) physical properties and not chemical properties. 
B) identical for all substances. 
C) independent of the volume of substance present. 
D) dependent on the amount of substance. 
E) dependent on factors external to the substance itself. 
A) physical properties and not chemical properties. 
B) identical for all substances. 
C) independent of the volume of substance present. 
D) dependent on the amount of substance. 
E) dependent on factors external to the substance itself.

Question 16

Which one of the following is not a physical process or change?

Accepted Answer

A) natural gas burning 
B) water boiling 
C) ice melting 
D) iodine vaporizing 
E) alcohol evaporating 
A) natural gas burning 
B) water boiling 
C) ice melting 
D) iodine vaporizing 
E) alcohol evaporating

Question 17

Spanish mahogany has a density of 53 lb/ft3. Would you be able to lift a piece of mahogany that measured 10 in   12 in   14 in?

Accepted Answer

A) No, it would weigh approximately 200 lb. 
B) No, it would be too awkward. 
C) Yes, it would weigh approximately 25 lb. 
D) Yes, it would weigh approximately 50 lb. 
E) Yes, it would weigh approximately 5 lb. 
A) No, it would weigh approximately 200 lb. 
B) No, it would be too awkward. 
C) Yes, it would weigh approximately 25 lb. 
D) Yes, it would weigh approximately 50 lb. 
E) Yes, it would weigh approximately 5 lb.

Question 18

If an atom is 0.1 nm in diameter, how many atoms must be lined up to make a row 1 cm long?

Accepted Answer

A) 104 
B) 106 
C) 108 
D) 1010 
E) 1012 
A) 104 
B) 106 
C) 108 
D) 1010 
E) 1012

Question 19

The density of iron is 7.9 g/cm3. What is the volume of a 4.5 kg iron block?

Accepted Answer

A) 570 cm3 
B) 0.570 cm3 
C) 3.56   104 cm3 
D) 35.6 cm3 
E) 1.76 cm3 
A) 570 cm3 
B) 0.570 cm3 
C) 3.56   104 cm3 
D) 35.6 cm3 
E) 1.76 cm3

Question 20

Which statement A-D about the reaction of methane with oxygen, which is called combustion and is represented by the reaction equation below, is not correct? The reaction products are carbon dioxide and water. CH4   2O2   CO2   2H2O

Accepted Answer

A) One molecule of methane combines with two molecules of oxygen. 
B) The products are one molecule of carbon dioxide and two molecules of water. 
C) The equation is balanced because the number of atoms of each element does not change. 
D) Four atoms of hydrogen combine with four atoms of oxygen to produce water. 
E) Statements A-D all are correct. 
A) One molecule of methane combines with two molecules of oxygen. 
B) The products are one molecule of carbon dioxide and two molecules of water. 
C) The equation is balanced because the number of atoms of each element does not change. 
D) Four atoms of hydrogen combine with four atoms of oxygen to produce water. 
E) Statements A-D all are correct.

Exam 1: Matter and Energy: The Origin of the Universe

Which of the following is the most massive?

Which of the following is an element?

Which one of the following is not a chemical reaction?

Which one of the following statements is not correct?

Which represents an intensive property?

An element ________

Molecules are represented in various ways. Which statement A-D about molecular representations is not correct.

Which of the following does not represent a physical property of caffeine?

The following measurements of the mass of an aspirin tablet were made by different students in a lab. Which set is the most precise?

Which one of the following statements is not correct?

A solid forming a liquid is called ________

In celebration of Mole Day, Turbo the snail competed in a race that was a mole (6.02 1023) of zeptometers long. If zepto represents a factor of 10-21, how long was the race in meters?

Which one of the following is not classified correctly?

John Dalton postulated that all matter is composed of small particles called atoms. For this proposition to be considered a valid scientific theory, ________

Extensive properties are ________

Which one of the following is not a physical process or change?

Spanish mahogany has a density of 53 lb/ft3. Would you be able to lift a piece of mahogany that measured 10 in 12 in 14 in?

If an atom is 0.1 nm in diameter, how many atoms must be lined up to make a row 1 cm long?

The density of iron is 7.9 g/cm3. What is the volume of a 4.5 kg iron block?

Which statement A-D about the reaction of methane with oxygen, which is called combustion and is represented by the reaction equation below, is not correct? The reaction products are carbon dioxide and water. CH4 2O2 CO2 2H2O

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

Filters

In celebration of Mole Day, Turbo the snail competed in a race that was a mole (6.02 10²³) of zeptometers long. If zepto represents a factor of 10^-21, how long was the race in meters?

Spanish mahogany has a density of 53 lb/ft³. Would you be able to lift a piece of mahogany that measured 10 in 12 in 14 in?

The density of iron is 7.9 g/cm³. What is the volume of a 4.5 kg iron block?

Which statement A-D about the reaction of methane with oxygen, which is called combustion and is represented by the reaction equation below, is not correct? The reaction products are carbon dioxide and water. CH₄ 2O₂ CO₂ 2H₂O