Question 1

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

Question 2

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

Question 3

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

Question 4

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 
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 5

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 
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 6

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 
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 7

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

Accepted Answer

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

Question 8

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. 
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 9

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. 
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.

Question 10

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 
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 11

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)    
A)    
B)    
C)    
D)    
E)

Question 12

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

Question 13

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

Question 14

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

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 15

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

Question 16

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. 
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 17

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

Question 18

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

Question 19

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 
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 20

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

Accepted Answer

A) True 
 B)False

Exam 2: Atoms and the Atomic Theory

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?

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

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?

Groups, or families, on the periodic table are:

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

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

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

Choose the INCORRECT statement.

Choose the correct statement.

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

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

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.

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

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

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

Which of the following statements is FALSE?

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?

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.

Beta particles:

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

Matter - Its Properties and Measurement

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

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?

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

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

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