Question 1

Which of the following statements is true about Bohr's planetary model of the atom?

Accepted Answer

A) The electrons orbit around the nucleus. 
B) It is a physical model. 
C) The energy difference between the orbits is continuous. 
D) The electrons smoothly move from one orbit to the next. 
E) none of the above 
A) The electrons orbit around the nucleus. 
B) It is a physical model. 
C) The energy difference between the orbits is continuous. 
D) The electrons smoothly move from one orbit to the next. 
E) none of the above

Question 2

Why can't we see atoms?

Accepted Answer

A) We see with light energy and the wavelength is larger than the object and so it is not reflected. 
B) Atoms are invisible. 
C) We cannot see things that are microscopic. 
D) We see with light energy but the atoms absorb all the light and therefore there are no reflections. 
E) Atoms do not interact with light energy and therefore we are unable to observe them with light. 
A) We see with light energy and the wavelength is larger than the object and so it is not reflected. 
B) Atoms are invisible. 
C) We cannot see things that are microscopic. 
D) We see with light energy but the atoms absorb all the light and therefore there are no reflections. 
E) Atoms do not interact with light energy and therefore we are unable to observe them with light.

Question 3

What does the following element description actually mean? iron-57

Accepted Answer

A) iron with a mass number of 57 
B) iron with an atomic number of 57 
C) iron with 57 protons 
D) iron with 57 neutrons 
E) 57 iron atoms 
A) iron with a mass number of 57 
B) iron with an atomic number of 57 
C) iron with 57 protons 
D) iron with 57 neutrons 
E) 57 iron atoms

Question 4

When we breathe we inhale oxygen, O2, and exhale carbon dioxide, CO2, plus water vapor, H2O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?

Accepted Answer

A) The air we inhale has more mass; Breathing causes you to lose weight. 
B) The air we exhale has more mass; Breathing causes you to lose weight. 
C) The air we inhale has more mass; Breathing causes you to gain weight. 
D) The air we exhale has more mass; Breathing causes you to gain weight. 
A) The air we inhale has more mass; Breathing causes you to lose weight. 
B) The air we exhale has more mass; Breathing causes you to lose weight. 
C) The air we inhale has more mass; Breathing causes you to gain weight. 
D) The air we exhale has more mass; Breathing causes you to gain weight.

Question 5

Does it make sense to say that a textbook is about 99.9 percent empty space?

Accepted Answer

A) No. A textbook is a solid and thus is quite dense. Therefore it is not 99.9 percent empty space. 
B) No. Only gases are considered to be 99.9 percent empty space. Liquids and solids are not. 
C) Yes. A textbook like all material things is made up of atoms, which are considered to be 99.9 percent empty space. 
D) No. A textbook could only be considered to be 99.9 percent empty space if it were combusted. 
A) No. A textbook is a solid and thus is quite dense. Therefore it is not 99.9 percent empty space. 
B) No. Only gases are considered to be 99.9 percent empty space. Liquids and solids are not. 
C) Yes. A textbook like all material things is made up of atoms, which are considered to be 99.9 percent empty space. 
D) No. A textbook could only be considered to be 99.9 percent empty space if it were combusted.

Question 6

If a neutral element has the following chemical notation, how many electrons does it have? fluorine-19

Accepted Answer

A) 9 
B) 10 
C) 11 
D) 19 
E) none of the above 
A) 9 
B) 10 
C) 11 
D) 19 
E) none of the above

Question 7

A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.

Accepted Answer

A) The dog is following the areas of increased density of the Earth. 
B) The dog is smelling atoms from the cat 
C) The dog is smelling molecules from the cat. 
D) The cat is leading the dog into a trap. 
A) The dog is following the areas of increased density of the Earth. 
B) The dog is smelling atoms from the cat 
C) The dog is smelling molecules from the cat. 
D) The cat is leading the dog into a trap.

Question 8

What property of an electron makes it possible to use electron microscopes?

Accepted Answer

A) They can be focused using smaller lenses. 
B) They have shorter wavelengths than visible light. 
C) They are electrically charged. 
D) They can be generated with electricity. 
E) none of the above 
A) They can be focused using smaller lenses. 
B) They have shorter wavelengths than visible light. 
C) They are electrically charged. 
D) They can be generated with electricity. 
E) none of the above

Which of the following statements is true about Bohr's planetary model of the atom?

Why can't we see atoms?

What does the following element description actually mean? iron-57

When we breathe we inhale oxygen, O₂, and exhale carbon dioxide, CO₂, plus water vapor, H₂O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?

Does it make sense to say that a textbook is about 99.9 percent empty space?

If a neutral element has the following chemical notation, how many electrons does it have? fluorine-19

A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.

What property of an electron makes it possible to use electron microscopes?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

Filters

Exam 12: Atoms and the Periodic Table

Which of the following statements is true about Bohr's planetary model of the atom?

Why can't we see atoms?

What does the following element description actually mean? iron-57

When we breathe we inhale oxygen, O2, and exhale carbon dioxide, CO2, plus water vapor, H2O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?

Does it make sense to say that a textbook is about 99.9 percent empty space?

If a neutral element has the following chemical notation, how many electrons does it have? fluorine-19

A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.

What property of an electron makes it possible to use electron microscopes?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

Filters

When we breathe we inhale oxygen, O₂, and exhale carbon dioxide, CO₂, plus water vapor, H₂O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?