Question 1

Identify the characteristics of a liquid.

Accepted Answer

A)   definite volume and definite shape
B)   definite volume and no definite shape
C)   no definite shape and definite volume
D)   no definite shape and no definite volumeE) B) and C)
F) A) and C)

Question 2

An atom of 17O contains ________ protons.

Accepted Answer

A)   8
B)   25
C)   9
D)   11
E)   17F) None of the above
G) B) and D)

Question 3

Two or more substances in variable proportions,where the composition is constant throughout are

Accepted Answer

A)   a compound.
B)   an element.
C)   a heterogeneous mixture.
D)   a homogeneous mixture.
E)   a crystalline solid.F) D) and E)
G) B) and D)

Question 4

Choose the pure substance from the list below.

Accepted Answer

A)   sea water
B)   diamond
C)   air
D)   coffee
E)   milkF) B) and D)
G) None of the above

Question 5

Calculate the atomic mass of element "X," if it has 2 naturally occurring isotopes with the following masses and natural abundances. X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%

Accepted Answer

A)   46.26 amu
B)   45.91 amu
C)   46.34 amu
D)   46.84 amu
E)   44.99 amuF) A) and B)
G) A) and D)

Question 6

How are gases different from solids and liquids?

Accepted Answer

A)   Gases can only be made up of atoms.
B)   The particles in a gas attract each other much more strongly than in solids and liquids.
C)   Gases are compressible.
D)   Only gases can take the shape of their container.
E)   Gases are colorless.F) All of the above
G) A) and D)

Question 7

Calculate the atomic mass of magnesium if magnesium has 3 naturally occurring stable isotopes with the following masses and natural abundances. Mg-24 23.9996 amu 78.99%
Mg-25 24.9858 amu 10.00%
Mg-26 25.9826 amu 11.01%

Accepted Answer

A)   22.53 amu
B)   24.32 amu
C)   24.86 amu
D)   25.41 amu
E)   23.92 amuF) A) and B)
G) A) and E)

Question 8

Identify the element that has an atomic number of 20.

Accepted Answer

A)   boron
B)   neon
C)   calcium
D)   zincE) A) and B)
F) A) and C)

Question 9

Identify the characteristics of a solid.

Accepted Answer

A)   definite volume and definite shape
B)   definite volume and no definite shape
C)   no definite shape and definite volume
D)   no definite shape and no definite volumeE) B) and C)
F) A) and D)

Question 10

Gallium has an atomic mass of 69.723 amu.The Ga-69 (68.926 amu) is 60.111%.What is the amu of the other isotope?

Accepted Answer

A)   70.924 amu
B)   70.932 amu
C)   70.928 amu
D)   70.920 amuE) A) and B)
F) All of the above

Question 11

The atomic number for iron is

Accepted Answer

A)   192.22
B)   77
C)   55.85
D)   26E) B) and C)
F) None of the above

Question 12

Calculate the mass (in kg) of 4.87 × 1025 atoms of Zn.

Accepted Answer

A)   5.29 kg
B)   1.89 kg
C)   8.09 kg
D)   1.24 kg
E)   1.09 kgF) C) and E)
G) A) and C)

Question 13

All statements about scientific theories are true EXCEPT

Accepted Answer

A)   they explain why nature behaves the way it does.
B)   they must have the ability to make predictions on future behavior.
C)   they should use observations to test the theory.
D)   they are derived from hypothesis.
E)   they are speculation.F) A) and E)
G) B) and E)

Question 14

Give the composition of hydrogen peroxide.

Accepted Answer

A)   two hydrogen atoms and two oxygen atoms
B)   one hydrogen atom and one oxygen atom
C)   two hydrogen atoms and one oxygen atom
D)   one hydrogen atom and two oxygen atomsE) A) and C)
F) All of the above

Question 15

What does "X" represent in the following symbol?  X

Accepted Answer

A)   selenium
B)   krypton
C)   sulfur
D)   bromine
E)   chlorineF) A) and C)
G) B) and C)

Question 16

Which of the following statements about subatomic particles is TRUE?

Accepted Answer

A)   A neutral atom contains the same number of protons and electrons.
B)   Protons have about the same mass as electrons.
C)   Electrons make up most of the mass of an atom.
D)   Protons and neutrons have opposite, but equal in magnitude, charges.
E)   Neutrons and electrons are found in the nucleus of an atom.F) All of the above
G) B) and C)

Question 17

What element is defined by the following information?
P+ = 11 n° = 12 e- = 11

Accepted Answer

A)   sodium
B)   vanadium
C)   magnesium
D)   titaniumE) A) and B)
F) All of the above

Exam 2: Atoms

Two or more substances in variable proportions,where the composition is constant throughout are

Correct Answer
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What does "X" represent in the following symbol? X

Correct Answer
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Calculate the mass (in kg) of 4.87 × 10²⁵ atoms of Zn.

Correct Answer
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All statements about scientific theories are true EXCEPT

Correct Answer
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How are gases different from solids and liquids?

Correct Answer
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Identify the characteristics of a liquid.

Correct Answer
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What element is defined by the following information? P⁺ = 11 n° = 12 e^- = 11

Correct Answer
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Calculate the atomic mass of element "X," if it has 2 naturally occurring isotopes with the following masses and natural abundances. X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

Correct Answer
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Identify the element that has an atomic number of 20.

Correct Answer
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The atomic number for iron is

Correct Answer
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Calculate the atomic mass of magnesium if magnesium has 3 naturally occurring stable isotopes with the following masses and natural abundances. Mg-24 23.9996 amu 78.99% Mg-25 24.9858 amu 10.00% Mg-26 25.9826 amu 11.01%

Correct Answer
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Choose the pure substance from the list below.

Correct Answer
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An atom of ¹⁷O contains ________ protons.

Correct Answer
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Gallium has an atomic mass of 69.723 amu.The Ga-69 (68.926 amu) is 60.111%.What is the amu of the other isotope?

Correct Answer
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Which of the following statements about subatomic particles is TRUE?

Correct Answer
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Identify the characteristics of a solid.

Correct Answer
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Give the composition of hydrogen peroxide.

Correct Answer
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Exam 2: Atoms

Two or more substances in variable proportions,where the composition is constant throughout are

Correct AnswerverifiedShow Answer

What does "X" represent in the following symbol? X

Correct AnswerverifiedShow Answer

Calculate the mass (in kg) of 4.87 × 1025 atoms of Zn.

Correct AnswerverifiedShow Answer

All statements about scientific theories are true EXCEPT

Correct AnswerverifiedShow Answer

How are gases different from solids and liquids?

Correct AnswerverifiedShow Answer

Identify the characteristics of a liquid.

Correct AnswerverifiedShow Answer

What element is defined by the following information? P+ = 11 n° = 12 e- = 11

Correct AnswerverifiedShow Answer

Calculate the atomic mass of element "X," if it has 2 naturally occurring isotopes with the following masses and natural abundances. X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

Correct AnswerverifiedShow Answer

Identify the element that has an atomic number of 20.

Correct AnswerverifiedShow Answer

The atomic number for iron is

Correct AnswerverifiedShow Answer

Calculate the atomic mass of magnesium if magnesium has 3 naturally occurring stable isotopes with the following masses and natural abundances. Mg-24 23.9996 amu 78.99% Mg-25 24.9858 amu 10.00% Mg-26 25.9826 amu 11.01%

Correct AnswerverifiedShow Answer

Choose the pure substance from the list below.

Correct AnswerverifiedShow Answer

An atom of 17O contains ________ protons.

Correct AnswerverifiedShow Answer

Gallium has an atomic mass of 69.723 amu.The Ga-69 (68.926 amu) is 60.111%.What is the amu of the other isotope?

Correct AnswerverifiedShow Answer

Which of the following statements about subatomic particles is TRUE?

Correct AnswerverifiedShow Answer

Identify the characteristics of a solid.

Correct AnswerverifiedShow Answer

Give the composition of hydrogen peroxide.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Calculate the mass (in kg) of 4.87 × 10²⁵ atoms of Zn.

Correct Answer
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Correct Answer
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What element is defined by the following information? P⁺ = 11 n° = 12 e^- = 11

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An atom of ¹⁷O contains ________ protons.

Correct Answer
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