Question 1

Which of the following best explains what is happening when an atom emits light?

Accepted Answer

A) An electron is dropping from a higher to a lower energy level with the difference in energy between the two being emitted as light energy. 
B) A proton is undergoing a nuclear change in the nucleus and is emitting a high energy light wave in the process. 
C) An electron is jumping from a low energy state to a high energy state with the difference in energy being converted to light energy. 
D) Heat energy is speeding up the orbit of the electrons and the resulting Doppler shift causes light to be emitted from the electrons. 
E) Heat energy is converting a neutron into a proton and an electron, which is ejected into the orbit of the nucleus, releasing light energy. 
A) An electron is dropping from a higher to a lower energy level with the difference in energy between the two being emitted as light energy. 
B) A proton is undergoing a nuclear change in the nucleus and is emitting a high energy light wave in the process. 
C) An electron is jumping from a low energy state to a high energy state with the difference in energy being converted to light energy. 
D) Heat energy is speeding up the orbit of the electrons and the resulting Doppler shift causes light to be emitted from the electrons. 
E) Heat energy is converting a neutron into a proton and an electron, which is ejected into the orbit of the nucleus, releasing light energy.

Question 2

What is the main difference between a conceptual model and a physical model?

Accepted Answer

A) A physical model represents the shape and form while a conceptual model describes how a system behaves. 
B) A conceptual model represents the shape and form while a physical model describes how a system behaves. 
C) Physical models can only be used to represent the real world. 
D) Conceptual models can only be used to describe concepts. 
E) Physical models and conceptual models can be used to describe the same things. 
A) A physical model represents the shape and form while a conceptual model describes how a system behaves. 
B) A conceptual model represents the shape and form while a physical model describes how a system behaves. 
C) Physical models can only be used to represent the real world. 
D) Conceptual models can only be used to describe concepts. 
E) Physical models and conceptual models can be used to describe the same things.

Question 3

Which of the above has the highest frequency?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 4

Which of the following atoms is the largest?

Accepted Answer

A) Ba 
B) Sr 
C) Ca 
D) Mg 
E) Be 
A) Ba 
B) Sr 
C) Ca 
D) Mg 
E) Be

Question 5

The following statement describes which subatomic particle best? It does not have an electrical charge.

Accepted Answer

A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C 
A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C

Question 6

An electron in the outermost shell of which group 1 element experiences the greatest effective nuclear charge?

Accepted Answer

A) Sodium, Na 
B) Potassium, K 
C) Rubidium, Rb 
D) all of the above 
A) Sodium, Na 
B) Potassium, K 
C) Rubidium, Rb 
D) all of the above

Question 7

Which of the following is not a property of an electron?

Accepted Answer

A) charge changes depending on mass 
B) fundamental component of atoms 
C) attracted towards positively charge electrical plates 
D) weighs approximately 9.1 × 10-31 kg 
E) has a negative charge 
A) charge changes depending on mass 
B) fundamental component of atoms 
C) attracted towards positively charge electrical plates 
D) weighs approximately 9.1 × 10-31 kg 
E) has a negative charge

Question 8

If an element has 18 protons and 20 neutrons and 18 electrons, which expression correctly identifies the element?

Accepted Answer

A) argon-38 
B) argon-18 
C) argon-20 
D) calcium-38 
E) calcium-20 
A) argon-38 
B) argon-18 
C) argon-20 
D) calcium-38 
E) calcium-20

Question 9

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.

Accepted Answer

A) The neutron is nearly massless. 
B) The neutron is only slightly more massive than the proton. 
C) The discovery required the use of ultrafast computers. 
D) The neutron lacks an electrical charge. 
A) The neutron is nearly massless. 
B) The neutron is only slightly more massive than the proton. 
C) The discovery required the use of ultrafast computers. 
D) The neutron lacks an electrical charge.

Question 10

What does the following element description actually mean?   O

Accepted Answer

A) an oxygen atom with 6 protons and 12 neutrons 
B) an oxygen atom with 6 neutrons and 12 protons 
C) 6 oxygen atoms with 18 neutrons 
D) 18 oxygen molecules with 6 neutrons each 
E) none of the above 
A) an oxygen atom with 6 protons and 12 neutrons 
B) an oxygen atom with 6 neutrons and 12 protons 
C) 6 oxygen atoms with 18 neutrons 
D) 18 oxygen molecules with 6 neutrons each 
E) none of the above

Question 11

How can a hydrogen atom, which has only one electron, have so many spectral lines?

Accepted Answer

A) The electron is able to move at various speeds. 
B) The protons in the nucleus are also giving off various light frequencies. 
C) Because there is more than one energy level in a hydrogen atom. 
D) The atomic radius of the hydrogen atom is relatively large. 
A) The electron is able to move at various speeds. 
B) The protons in the nucleus are also giving off various light frequencies. 
C) Because there is more than one energy level in a hydrogen atom. 
D) The atomic radius of the hydrogen atom is relatively large.

Question 12

Which of the following is said to be quantized?

Accepted Answer

A) the number of eggs in an egg carton 
B) the amount of water in a glass 
C) the volume of air in a balloon 
D) the amount of time in an hour 
E) none of the above 
A) the number of eggs in an egg carton 
B) the amount of water in a glass 
C) the volume of air in a balloon 
D) the amount of time in an hour 
E) none of the above

Question 13

How is the term photon related to the term quantum?

Accepted Answer

A) A quantum of light is actually one photon. 
B) A quantum of photons is equal to the wavelength. 
C) A quantum is a particle of light while a photon is a wave of light. 
D) A quantum is a particle of light exactly one photon long. 
E) A quantum is a wave of light while a packet of quanta equals one photon. 
A) A quantum of light is actually one photon. 
B) A quantum of photons is equal to the wavelength. 
C) A quantum is a particle of light while a photon is a wave of light. 
D) A quantum is a particle of light exactly one photon long. 
E) A quantum is a wave of light while a packet of quanta equals one photon.

Question 14

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 15

If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?

Accepted Answer

A)    N 
B)    O 
C)    O 
D)    O 
E) cannot tell from information given 
A)    N 
B)    O 
C)    O 
D)    O 
E) cannot tell from information given

Question 16

Rutherford assumed that the atomic nucleus was positively charged because ________.

Accepted Answer

A) electrons were already established to be negatively charged 
B) the alpha particles that ricocheted off of the nucleus are also positively charged 
C) he had a very optimistic outlook on life 
D) Two of the above are reasonable answers 
A) electrons were already established to be negatively charged 
B) the alpha particles that ricocheted off of the nucleus are also positively charged 
C) he had a very optimistic outlook on life 
D) Two of the above are reasonable answers

Question 17

If you remove two protons and two electrons from a sulfur atom (S), what new element is formed?

Accepted Answer

A) Si 
B) Si+2 
C) Al+2 
D) Al 
E) Ar-2 
A) Si 
B) Si+2 
C) Al+2 
D) Al 
E) Ar-2

Question 18

Rank the following by the relative amounts of energy, from most energetic to least:

Accepted Answer

A) gamma rays, blue light, red light, radio waves 
B) gamma rays, radio waves, blue light, red light 
C) radio waves, gamma rays, blue light, red light 
D) blue light, red light, radio waves, gamma rays 
E) red light, radio waves, blue light, gamma rays 
A) gamma rays, blue light, red light, radio waves 
B) gamma rays, radio waves, blue light, red light 
C) radio waves, gamma rays, blue light, red light 
D) blue light, red light, radio waves, gamma rays 
E) red light, radio waves, blue light, gamma rays

Question 19

Does a shell have to contain electrons in order to exist?

Accepted Answer

A) A shell is a form of energy that requires electrons in order to exist. 
B) A shell is just a region of space which may or may not contain electrons. 
C) A shell is just a conceptual model, hence, it doesn't really exist with or without the electron. 
D) Two of the above are reasonable answers. 
A) A shell is a form of energy that requires electrons in order to exist. 
B) A shell is just a region of space which may or may not contain electrons. 
C) A shell is just a conceptual model, hence, it doesn't really exist with or without the electron. 
D) Two of the above are reasonable answers.

Question 20

How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values?

Accepted Answer

A) Electrons are only able to vibrate at particular frequencies. 
B) When an electron wave is confined, it is reinforced only at particular frequencies. 
C) The energy values of an electron only occur where its wave properties and probability clouds are mutually reinforcing. 
D) The wave model accounts for the types of orbitals an electron may occupy, not it's energy levels. 
A) Electrons are only able to vibrate at particular frequencies. 
B) When an electron wave is confined, it is reinforced only at particular frequencies. 
C) The energy values of an electron only occur where its wave properties and probability clouds are mutually reinforcing. 
D) The wave model accounts for the types of orbitals an electron may occupy, not it's energy levels.

Which of the following best explains what is happening when an atom emits light?

What is the main difference between a conceptual model and a physical model?

Which of the above has the highest frequency?

Which of the following atoms is the largest?

The following statement describes which subatomic particle best? It does not have an electrical charge.

An electron in the outermost shell of which group 1 element experiences the greatest effective nuclear charge?

Which of the following is not a property of an electron?

If an element has 18 protons and 20 neutrons and 18 electrons, which expression correctly identifies the element?

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.

What does the following element description actually mean? O

How can a hydrogen atom, which has only one electron, have so many spectral lines?

Which of the following is said to be quantized?

How is the term photon related to the term quantum?

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

If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?

Rutherford assumed that the atomic nucleus was positively charged because ________.

If you remove two protons and two electrons from a sulfur atom (S), what new element is formed?

Rank the following by the relative amounts of energy, from most energetic to least:

Does a shell have to contain electrons in order to exist?

How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values?

About Science

Particles of Matter

Elements of Chemistry

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

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Exam 4: Subatomic Particles

Which of the following best explains what is happening when an atom emits light?

What is the main difference between a conceptual model and a physical model?

Which of the above has the highest frequency?

Which of the following atoms is the largest?

The following statement describes which subatomic particle best? It does not have an electrical charge.

An electron in the outermost shell of which group 1 element experiences the greatest effective nuclear charge?

Which of the following is not a property of an electron?

If an element has 18 protons and 20 neutrons and 18 electrons, which expression correctly identifies the element?

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.

What does the following element description actually mean? O

How can a hydrogen atom, which has only one electron, have so many spectral lines?

Which of the following is said to be quantized?

How is the term photon related to the term quantum?

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

If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?

Rutherford assumed that the atomic nucleus was positively charged because ________.

If you remove two protons and two electrons from a sulfur atom (S), what new element is formed?

Rank the following by the relative amounts of energy, from most energetic to least:

Does a shell have to contain electrons in order to exist?

How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values?

About Science

Particles of Matter

Elements of Chemistry

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters