Question 1

In a neutral atom, the number of protons must equal the number of neutrons.

Accepted Answer

A) True 
 B)False

Question 2

A naturally occurring element consists of three isotopes. The data for the isotopes are:
Isotope 1: 146.9672 u, 64.792%
Isotope 2: 148.9638 u, 26.117%
Isotope 3: 149.9592 u, 9.0910% What is the average atomic mass of this naturally occurring element?

Accepted Answer

A)  49.254 u
B)  147.76 u
C)  148.63 u
D)  148.67 u
E)  147.88 uF) D) and E)
G) C) and D)

Question 3

The atomic force microscope that is used with electrically nonconducting samples makes it possible to obtain an image of individual atoms.

Accepted Answer

A) True 
 B)False

Question 4

Which answer below best describes all atoms of a particular element?

Accepted Answer

A)  They possess the same number of electrons, the same atomic number, and the same mass, but have nothing else in common.
B)  They possess the same mass and the same chemical properties but have nothing else in common.
C)  They possess the same number of electrons and the same atomic number but may differ in mass.
D)  They possess the same number of electrons, chemical properties, and mass but have nothing else in common.
E)  They possess the same atomic number and the same mass but have nothing else in common.F) A) and D)
G) A) and B)

Question 5

When positive ions are formed in a mass spectrometer, they are attracted to a positively charged metal plate that has a small hole in its center.

Accepted Answer

A) True 
 B)False

Question 6

Which of these scientists developed the atomic theory?

Accepted Answer

A)  John Dalton
B)  J. J. Thomson
C)  Robert Millikan
D)  Henry Moseley
E)  Ernest RutherfordF) All of the above
G) C) and D)

Question 7

Which one of the following contributes to the charge of an atom, but does NOT contribute significantly to the mass of an atom?

Accepted Answer

A)  electrons
B)  nuclei
C)  photons
D)  neutrons
E)  protonsF) A) and D)
G) B) and E)

Question 8

What two factors determine the final chemical makeup of a planet?

Accepted Answer

The composition of: 1)chemical...

Question 9

A compound is made of nitrogen and hydrogen in a ratio of 22.6 grams nitrogen to 4.88 grams of hydrogen. There are ________ grams of hydrogen in a sample of the compound containing 12.6 grams of nitrogen. Hint: Consider the ratio of the masses to determine the mass of hydrogen.

Accepted Answer

The answer of A compound is made of nitrogen and...

Question 10

In a mass spectrometer, a beam of ions is sorted by the magnet into a number of beams based on the same charges that they have.

Accepted Answer

A) True 
 B)False

Question 11

The atomic mass of naturally occurring nickel, which is a mixture of isotopes, is listed as 58.6934 u. This means that the average mass of nickel is

Accepted Answer

A)  58.6934 times as great as that of a 12C atom.
B)  58.6934 times as great as that of a 1H atom.
C)  58.6934/1.0079 times as great as that of a 1H atom.
D)  58.6934/12.000 times as great as that of a 12C atom.
E)  58.6934/12.011 times as great as that of a 12C atom.F) A) and C)
G) A) and B)

Question 12

Which description below fits the   atom?Hint: Remember how charge alters the number of electrons.

Accepted Answer

A)  29 protons, 65 neutrons, 29 electrons
B)  29 protons, 36 neutrons, 65 electrons
C)  29 protons, 36 neutrons, 31 electrons
D)  29 protons, 36 neutrons, 27 electrons
E)  31 protons, 34 neutrons, 29 electronsF) B) and D)
G) A) and D)

Question 13

Consider the atoms of 65Cu and 65Zn. Both of these atoms have the same

Accepted Answer

A)  number of electrons.
B)  atomic mass.
C)  number of neutrons.
D)  mass number.
E)  number of protons.F) A) and E)
G) All of the above

Question 14

The hydrogen atom minus an electron is known as the proton.

Accepted Answer

A) True 
 B)False

Question 15

In a mass spectrometer, a beam of ions emerge from between the poles of the magnet after being sorted into an array of beams based on their masses.

Accepted Answer

A) True 
 B)False

Question 16

How many nucleons are in an atom of 40K?

Accepted Answer

Question 17

An ion of the isotope chlorine-35 has an ionic charge of 1-. How many protons, neutrons, and electrons does it contain? (p = proton, n = neutron, e = electron) Hint: Consider how changes in the number of electrons versus the number of protons affects the ionic charge of an ion.

Accepted Answer

A)  17 p, 35 n, 17 e
B)  17 p, 17 n, 35 e
C)  18 p, 17 n, 18 e
D)  17 p, 18 n, 18 e
E)  35 p, 17 n, 18 eF) A) and B)
G) A) and C)

Question 18

Planets are formed after supernovas from ________ left over from the formation of a new star.

Accepted Answer

The answer of Planets are formed after supernovas from ________...

Question 19

Which of the following statements is/are NOT consistent with Dalton's atomic theory?
I. The atoms in a given sample of an element do not share any common properties.
II. Matter consists of tiny particles called molecular substances.
III. In chemical reactions, atoms merely rearrange and do not disintegrate.

Accepted Answer

A)  III only
B)  II only
C)  I only
D)  II and III
E)  I and IIF) A) and B)
G) C) and E)

Question 20

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Accepted Answer

A)  There were not enough neutrons and protons to produce large elements.
B)  The density of protons and neutrons was not large enough.
C)  The electrons were not present yet to form protons and neutrons to a large scale.
D)  Temperatures were still too great for a large number of protons and neutrons to stabilize into one atom.
E)  There were not enough neutrons to produce large elements.F) All of the above
G) A) and B)

Exam 1: A Very Brief History of Chemistry

Correct Answer
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A compound is made of nitrogen and hydrogen in a ratio of 22.6 grams nitrogen to 4.88 grams of hydrogen. There are ________ grams of hydrogen in a sample of the compound containing 12.6 grams of nitrogen. Hint: Consider the ratio of the masses to determine the mass of hydrogen.

Correct Answer
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The hydrogen atom minus an electron is known as the proton.

Correct Answer
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Which of these scientists developed the atomic theory?

Correct Answer
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In a mass spectrometer, a beam of ions emerge from between the poles of the magnet after being sorted into an array of beams based on their masses.

Correct Answer
verified

Planets are formed after supernovas from ________ left over from the formation of a new star.

Correct Answer
verified

What two factors determine the final chemical makeup of a planet?

Correct Answer
verified
The composition of: 1)chemical...
View Answer

Consider the atoms of ⁶⁵Cu and ⁶⁵Zn. Both of these atoms have the same

Correct Answer
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Which one of the following contributes to the charge of an atom, but does NOT contribute significantly to the mass of an atom?

Correct Answer
verified

Which description below fits the atom?Hint: Remember how charge alters the number of electrons.

Correct Answer
verified

Which answer below best describes all atoms of a particular element?

Correct Answer
verified

The atomic force microscope that is used with electrically nonconducting samples makes it possible to obtain an image of individual atoms.

Correct Answer
verified

The atomic mass of naturally occurring nickel, which is a mixture of isotopes, is listed as 58.6934 u. This means that the average mass of nickel is

Correct Answer
verified

How many nucleons are in an atom of ⁴⁰K?

Correct Answer
verified

A naturally occurring element consists of three isotopes. The data for the isotopes are: Isotope 1: 146.9672 u, 64.792% Isotope 2: 148.9638 u, 26.117% Isotope 3: 149.9592 u, 9.0910% What is the average atomic mass of this naturally occurring element?

Correct Answer
verified

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Correct Answer
verified

In a neutral atom, the number of protons must equal the number of neutrons.

Correct Answer
verified

An ion of the isotope chlorine-35 has an ionic charge of 1-. How many protons, neutrons, and electrons does it contain? (p = proton, n = neutron, e = electron) Hint: Consider how changes in the number of electrons versus the number of protons affects the ionic charge of an ion.

Correct Answer
verified

In a mass spectrometer, a beam of ions is sorted by the magnet into a number of beams based on the same charges that they have.

Correct Answer
verified

When positive ions are formed in a mass spectrometer, they are attracted to a positively charged metal plate that has a small hole in its center.

Correct Answer
verified

Exam 1: A Very Brief History of Chemistry

Correct AnswerverifiedShow Answer

A compound is made of nitrogen and hydrogen in a ratio of 22.6 grams nitrogen to 4.88 grams of hydrogen. There are ________ grams of hydrogen in a sample of the compound containing 12.6 grams of nitrogen. Hint: Consider the ratio of the masses to determine the mass of hydrogen.

Correct AnswerverifiedShow Answer

The hydrogen atom minus an electron is known as the proton.

Correct AnswerverifiedShow Answer

Which of these scientists developed the atomic theory?

Correct AnswerverifiedShow Answer

In a mass spectrometer, a beam of ions emerge from between the poles of the magnet after being sorted into an array of beams based on their masses.

Correct AnswerverifiedShow Answer

Planets are formed after supernovas from ________ left over from the formation of a new star.

Correct AnswerverifiedShow Answer

What two factors determine the final chemical makeup of a planet?

Correct AnswerverifiedThe composition of: 1)chemical...View AnswerShow Answer

Consider the atoms of 65Cu and 65Zn. Both of these atoms have the same

Correct AnswerverifiedShow Answer

Which one of the following contributes to the charge of an atom, but does NOT contribute significantly to the mass of an atom?

Correct AnswerverifiedShow Answer

Which description below fits the atom?Hint: Remember how charge alters the number of electrons.

Correct AnswerverifiedShow Answer

Which answer below best describes all atoms of a particular element?

Correct AnswerverifiedShow Answer

The atomic force microscope that is used with electrically nonconducting samples makes it possible to obtain an image of individual atoms.

Correct AnswerverifiedShow Answer

The atomic mass of naturally occurring nickel, which is a mixture of isotopes, is listed as 58.6934 u. This means that the average mass of nickel is

Correct AnswerverifiedShow Answer

How many nucleons are in an atom of 40K?

Correct AnswerverifiedShow Answer

A naturally occurring element consists of three isotopes. The data for the isotopes are: Isotope 1: 146.9672 u, 64.792% Isotope 2: 148.9638 u, 26.117% Isotope 3: 149.9592 u, 9.0910% What is the average atomic mass of this naturally occurring element?

Correct AnswerverifiedShow Answer

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Correct AnswerverifiedShow Answer

In a neutral atom, the number of protons must equal the number of neutrons.

Correct AnswerverifiedShow Answer

An ion of the isotope chlorine-35 has an ionic charge of 1-. How many protons, neutrons, and electrons does it contain? (p = proton, n = neutron, e = electron) Hint: Consider how changes in the number of electrons versus the number of protons affects the ionic charge of an ion.

Correct AnswerverifiedShow Answer

In a mass spectrometer, a beam of ions is sorted by the magnet into a number of beams based on the same charges that they have.

Correct AnswerverifiedShow Answer

When positive ions are formed in a mass spectrometer, they are attracted to a positively charged metal plate that has a small hole in its center.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
The composition of: 1)chemical...
View Answer

Consider the atoms of ⁶⁵Cu and ⁶⁵Zn. Both of these atoms have the same

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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How many nucleons are in an atom of ⁴⁰K?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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