Question 1

What is the density (g/cm3)  of tin if 4.56 × 1020 atoms make a cube 2.31 mm on each side?

Accepted Answer

A)   0.00729
B)   169
C)   3.28
D)   0.0142
E)   7.29

Question 2

How many moles of lead are present in a piece of lead with a volume of 0.600 cm3? The density of Pb is 11.34 g/cm3.

Accepted Answer

A)   6.80
B)   0.0328
C)   11.0
D)   0.547
E)   0.0912

Question 3

Beta particles:

Accepted Answer

A)   have a mass of 4 and a charge of +2
B)   are like X-rays
C)   are repelled by a positively charged plate
D)   are electrons
E)   have the same mass as a neutron

Question 4

Which of the following statements is FALSE?

Accepted Answer

A)   Michael Faraday discovered cathode rays.
B)   J .J. Thomson suggested the "plum pudding" model of the atom.
C)   Robert Millikan determined the charge on an electron.
D)   J. J. Thomson determined the charge-to-mass ratio for electrons.
E)   Michael Faraday determined that cathode rays were the fundamental negatively charged particles and called them electrons.

Question 5

A lead cube that is 3.00 cm on each side contains 8.91 × 1023 atoms. What is the density of this cube in g/cm3?

Accepted Answer

A)   34.1
B)   11.4
C)   0.0550
D)   0.990
E)   26.7

Question 6

Choose the INCORRECT statement.

Accepted Answer

A)   Gamma rays are bent by magnetic fields as a ray of positive charges.
B)   Protons and neutrons are found in the nucleus.
C)   Protons and neutrons are close to the same mass.
D)   The atomic number is the proton number.
E)   The mass number is the number of protons plus neutrons.

Question 7

There are two stable isotopes of supposium (Su) . Su-191 = 190.9609 u (27.30%)  Su-194 = 193.9633 u (72.70%) 
Compute the atomic mass of supposium.

Accepted Answer

A)   190.9 u
B)   194.0 u
C)   191.8 u
D)   192.5 u
E)   193.1 u

Question 8

How many moles are represented by 2.5 × 1015 Na atoms?

Accepted Answer

A)   3.8 × 10-10 mol
B)   1.8 × 10-10 mol
C)   1.5 × 1039 mol
D)   4.2 × 10-9 mol
E)   1.1 × 1014 mol

Question 9

The total numbers of neutrons, protons, and electrons in 31P3- are:

Accepted Answer

A)   15 neutrons, 31 protons, 15 electrons
B)   16 neutrons, 15 protons, 18 electrons
C)   31 neutrons, 15 protons, 18 electrons
D)   15 neutrons, 16 protons, 12 electrons
E)   16 neutrons, 16 protons, 18 electrons

Question 10

Calculate the percent abundance of the two isotopes of a fictional element, georgium, if it has an average atomic mass of 291.23 u. Go-290 289.86 u
Go-292 292.07 u

Accepted Answer

A)   Go-290, 38% and Go-292, 62%
B)   Go-290, 62% and Go-292, 38%
C)   Go-290, 42% and Go-292, 58%
D)   Go-290, 58% and Go-292, 42%
E)   cannot be determined

Question 11

A hypothetical element, E, has two stable isotopes. E-38 = 38.012 u 75.68%
E-46 = 45.981 u 24.32%
The element's atomic mass would be closest to which of the elements?

Accepted Answer

A)   K
B)   Ar
C)   Ca
D)   Sc
E)   Cl

Question 12

What is the atomic weight of an element if 4.00 grams of it contain 2.98 × 1022 atoms?

Accepted Answer

A)   20.2 u
B)   80.8 u
C)   19.7 u
D)   8.08 u
E)   2.02 u

Question 13

A certain mass of nickel reacts with sulphur to produce 2.83 g of NiS. The same mass of nickel reacts completely with 0.5 g of oxygen to produce 2.33 g of NiO. How many grams of sulfur reacted in the first reaction?

Accepted Answer

A)   0.5 g
B)   1 g
C)   1.5 g
D)   10-1 g
E)   1.25 g

Question 14

Isotopes have different atomic number (Z) but the same mass number (A).

Accepted Answer

A) True 
 B)False

Question 15

Write the appropriate symbol for the species containing 18 neutrons, 17 protons, and 16 electrons.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 16

What is the mass of a sample containing 1.2 moles of Ni?

Accepted Answer

A)   49 g
B)   59 g
C)   34 g
D)   61 g
E)   70 g

Question 17

The total number of neutrons in an 192Ir2+ cation is ________.

Accepted Answer

A)   115
B)   77
C)   192
D)   75
E)   269

Question 18

An anion has 45 neutrons and 36 electrons. If it has a -1 charge, what is its correct symbol?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 19

Groups, or families, on the periodic table are:

Accepted Answer

A)   vertical columns of elements with similar properties
B)   horizontal rows of elements with increasing atomic numbers
C)   named for the first elements in the series; such as "actinides"
D)   extremely reactive with each other
E)   elements that all occur naturally in the same state

Question 20

Choose the correct statement.

Accepted Answer

A)   Neutrons have no charge and no mass.
B)   An electron has 1/1837 the mass of a proton.
C)   The atomic number is the total number of protons and neutrons in the nucleus.
D)   The charge of a proton is 1837 times the charge of an electron.
E)   Electrons and protons have about the same mass.

Exam 2: Atoms and the Atomic Theory

Choose the correct statement.

Correct AnswerverifiedShow Answer

What is the density (g/cm3) of tin if 4.56 × 1020 atoms make a cube 2.31 mm on each side?

Correct AnswerverifiedShow Answer

What is the mass of a sample containing 1.2 moles of Ni?

Correct AnswerverifiedShow Answer

The total number of neutrons in an 192Ir2+ cation is ________.

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

A certain mass of nickel reacts with sulphur to produce 2.83 g of NiS. The same mass of nickel reacts completely with 0.5 g of oxygen to produce 2.33 g of NiO. How many grams of sulfur reacted in the first reaction?

Correct AnswerverifiedShow Answer

A hypothetical element, E, has two stable isotopes. E-38 = 38.012 u 75.68% E-46 = 45.981 u 24.32% The element's atomic mass would be closest to which of the elements?

Correct AnswerverifiedShow Answer

There are two stable isotopes of supposium (Su) . Su-191 = 190.9609 u (27.30%) Su-194 = 193.9633 u (72.70%) Compute the atomic mass of supposium.

Correct AnswerverifiedShow Answer

Groups, or families, on the periodic table are:

Correct AnswerverifiedShow Answer

The total numbers of neutrons, protons, and electrons in 31P3- are:

Correct AnswerverifiedShow Answer

Beta particles:

Correct AnswerverifiedShow Answer

Calculate the percent abundance of the two isotopes of a fictional element, georgium, if it has an average atomic mass of 291.23 u. Go-290 289.86 u Go-292 292.07 u

Correct AnswerverifiedShow Answer

How many moles of lead are present in a piece of lead with a volume of 0.600 cm3? The density of Pb is 11.34 g/cm3.

Correct AnswerverifiedShow Answer

Write the appropriate symbol for the species containing 18 neutrons, 17 protons, and 16 electrons.

Correct AnswerverifiedShow Answer

How many moles are represented by 2.5 × 1015 Na atoms?

Correct AnswerverifiedShow Answer

Choose the INCORRECT statement.

Correct AnswerverifiedShow Answer

What is the atomic weight of an element if 4.00 grams of it contain 2.98 × 1022 atoms?

Correct AnswerverifiedShow Answer

An anion has 45 neutrons and 36 electrons. If it has a -1 charge, what is its correct symbol?

Correct AnswerverifiedShow Answer

A lead cube that is 3.00 cm on each side contains 8.91 × 1023 atoms. What is the density of this cube in g/cm3?

Correct AnswerverifiedShow Answer

Isotopes have different atomic number (Z) but the same mass number (A).

Correct AnswerverifiedShow Answer

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What is the density (g/cm3) of tin if 4.56 × 10²⁰ atoms make a cube 2.31 mm on each side?

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How many moles are represented by 2.5 × 10¹⁵ Na atoms?

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What is the atomic weight of an element if 4.00 grams of it contain 2.98 × 10²² atoms?

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A lead cube that is 3.00 cm on each side contains 8.91 × 10²³atoms. What is the density of this cube in g/cm3?

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