Question 1

How many atoms of sulfur are in 280 g of a 50% by mass H2SO4 solution?

Accepted Answer

A)  8.6 × 1025 atoms 
B)  8.6 × 1023 atoms 
C)  8.0 × 1025 atoms 
D)  8.0 × 1023 atoms 
E)  2.8 × 1029 atoms 
A)  8.6 × 1025 atoms 
B)  8.6 × 1023 atoms 
C)  8.0 × 1025 atoms 
D)  8.0 × 1023 atoms 
E)  2.8 × 1029 atoms B

Question 2

Which is the more abundant isotope, Cl-35 or Cl-37?

Accepted Answer

A)  The two isotopes are equal in abundance. 
B)  Cl-37 
C)  Cl-35 
D)  A third unstable isotope is more abundant. 
E)  Cl-17 
A)  The two isotopes are equal in abundance. 
B)  Cl-37 
C)  Cl-35 
D)  A third unstable isotope is more abundant. 
E)  Cl-17 C

Question 3

The number of protons and neutrons in the nucleus of a given atom is called the atomic number.

Accepted Answer

A) True 
 B)False  False

Question 4

A 25 g sample of sugar is found to contain 51.4% oxygen by mass. Another 250 g sample of the same sugar is also 51.4% oxygen by mass. This is consistent with the:

Accepted Answer

A)  law of conservation of mass 
B)  law of constant composition 
C)  law of multiple proportions 
D)  first assumption of Dalton's atomic theory 
E)  second assumption of Dalton's theory 
A)  law of conservation of mass 
B)  law of constant composition 
C)  law of multiple proportions 
D)  first assumption of Dalton's atomic theory 
E)  second assumption of Dalton's theory

Question 5

How many atoms of silicon are contained in 8.50 × 10-5 grams?

Accepted Answer

A)  1.44 × 1023 atoms 
B)  1.82 × 1018 atoms 
C)  5.02 × 1030 atoms 
D)  5.02 × 1018 atoms 
E)  1.82 × 1020 atoms 
A)  1.44 × 1023 atoms 
B)  1.82 × 1018 atoms 
C)  5.02 × 1030 atoms 
D)  5.02 × 1018 atoms 
E)  1.82 × 1020 atoms

Question 6

Iodine is a member of the family called ________.

Accepted Answer

A)  metals 
B)  metalloids 
C)  noble gasses 
D)  halogens 
E)  actinides 
A)  metals 
B)  metalloids 
C)  noble gasses 
D)  halogens 
E)  actinides

Question 7

The atomic weight of chlorine is very close to 35.5. This means that:

Accepted Answer

A)  chlorine occurs with a variable number of protons 
B)  a variable number of electrons gives the fractional weight 
C)  on the average, an atom of chlorine weighs almost 3 times as much as carbon 
D)  the actual weight of a chlorine atom is not known very precisely 
E)  chlorine atoms contain half of a proton 
A)  chlorine occurs with a variable number of protons 
B)  a variable number of electrons gives the fractional weight 
C)  on the average, an atom of chlorine weighs almost 3 times as much as carbon 
D)  the actual weight of a chlorine atom is not known very precisely 
E)  chlorine atoms contain half of a proton

Question 8

The total numbers of neutrons, protons, and electrons in 35Cl- are ________.

Accepted Answer

A)  17 neutrons, 35 protons, 36 electrons 
B)  35 neutrons, 17 protons, 18 electrons 
C)  18 neutrons, 17 protons, 16 electrons 
D)  18 neutrons, 17 protons, 18 electrons 
E)  17 neutrons, 17 protons, 17 electrons 
A)  17 neutrons, 35 protons, 36 electrons 
B)  35 neutrons, 17 protons, 18 electrons 
C)  18 neutrons, 17 protons, 16 electrons 
D)  18 neutrons, 17 protons, 18 electrons 
E)  17 neutrons, 17 protons, 17 electrons

Question 9

What is the average mass in kilograms of one atom of arsenic?

Accepted Answer

A)  74.922 kg 
B)  0.074922 kg 
C)  5.48 × 10-23 kg 
D)  1.24 × 10-25 kg 
E)  1.24 × 10-22 kg 
A)  74.922 kg 
B)  0.074922 kg 
C)  5.48 × 10-23 kg 
D)  1.24 × 10-25 kg 
E)  1.24 × 10-22 kg

Question 10

With mass spectral data the ratio of the mass of 14N/12C was found to be 1.167. What is the mass of the 14N atom?

Accepted Answer

A)  14.017 u 
B)  10.292 u 
C)  14.004 u 
D)  17.000 u 
E)  14.007 u 
A)  14.017 u 
B)  10.292 u 
C)  14.004 u 
D)  17.000 u 
E)  14.007 u

Question 11

How many atoms of lead are required to cover a 33.0 cm by 45.0 cm area with a sheet of lead that is 0.140 mm thick? The density of lead is 11.35 g/cm3.

Accepted Answer

A)  6.86 × 1023 
B)  2.29 × 1026 
C)  2.29 × 1025 
D)  6.86 × 1022 
E)  1.42 × 1026 
A)  6.86 × 1023 
B)  2.29 × 1026 
C)  2.29 × 1025 
D)  6.86 × 1022 
E)  1.42 × 1026

Question 12

Different ratios of atoms produce different compounds.

Accepted Answer

A) True 
 B)False

Question 13

The three naturally occurring isotopes of magnesium are 24Mg (23.985042 u, 78.99%), 25Mg (24.985837, 10.00%), and 26Mg. What is the atomic mass of 26Mg?

Accepted Answer

A)  25.98 u 
B)  48.67 u 
C)  23.94 u 
D)  26.43 u 
E)  24.31 u 
A)  25.98 u 
B)  48.67 u 
C)  23.94 u 
D)  26.43 u 
E)  24.31 u

Question 14

The vertical columns in the periodic table of the elements are called groups.

Accepted Answer

A) True 
 B)False

Question 15

Atoms retain their identity during a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 16

Write the symbol for the most common ion formed by sulfur.

Accepted Answer

A)  S-1 
B)  S-2 
C)  S+1 
D)  S+2 
E)  requires experimental data 
A)  S-1 
B)  S-2 
C)  S+1 
D)  S+2 
E)  requires experimental data

Question 17

Lead-206 has a relative abundance of 23.6%. What size block of lead (in cubic centimeters) will contain 8.34 × 1021 atoms of lead-206? The density of lead is 11.35 g/cm3.

Accepted Answer

A)  0.0107 
B)  0.253 
C)  1.07 
D)  0.330 
E)  12.1 
A)  0.0107 
B)  0.253 
C)  1.07 
D)  0.330 
E)  12.1

Question 18

31.0 grams of the element phosphorus contain:

Accepted Answer

A)  6.02 × 1023 P4 molecules 
B)  31.0 × (6.02 × 1023) P atoms 
C)  6.02 × 1023 P atoms 
D)  31.0 P atoms 
E)  31.0 moles of P 
A)  6.02 × 1023 P4 molecules 
B)  31.0 × (6.02 × 1023) P atoms 
C)  6.02 × 1023 P atoms 
D)  31.0 P atoms 
E)  31.0 moles of P

Question 19

24.9 g of Mn is equivalent to how many moles of Mn?

Accepted Answer

A)  2.21 moles 
B)  0.453 moles 
C)  0.461 moles 
D)  0.996 moles 
E)  1.00 mole 
A)  2.21 moles 
B)  0.453 moles 
C)  0.461 moles 
D)  0.996 moles 
E)  1.00 mole

Question 20

What is the mass in grams of 1 atom of sulfur (atomic mass = 32.066)?

Accepted Answer

A)  1.661 × 10-24 g 
B)  1.931 × 10-25 g 
C)  5.325 × 10-23 g 
D)  5.179 × 10-26 g 
E)  5.989 × 10-23 g 
A)  1.661 × 10-24 g 
B)  1.931 × 10-25 g 
C)  5.325 × 10-23 g 
D)  5.179 × 10-26 g 
E)  5.989 × 10-23 g

Exam 2: Atoms and the Atomic Theory

How many atoms of sulfur are in 280 g of a 50% by mass H2SO4 solution?

Which is the more abundant isotope, Cl-35 or Cl-37?

The number of protons and neutrons in the nucleus of a given atom is called the atomic number.

A 25 g sample of sugar is found to contain 51.4% oxygen by mass. Another 250 g sample of the same sugar is also 51.4% oxygen by mass. This is consistent with the:

How many atoms of silicon are contained in 8.50 × 10-5 grams?

Iodine is a member of the family called ________.

The atomic weight of chlorine is very close to 35.5. This means that:

The total numbers of neutrons, protons, and electrons in 35Cl- are ________.

What is the average mass in kilograms of one atom of arsenic?

With mass spectral data the ratio of the mass of 14N/12C was found to be 1.167. What is the mass of the 14N atom?

How many atoms of lead are required to cover a 33.0 cm by 45.0 cm area with a sheet of lead that is 0.140 mm thick? The density of lead is 11.35 g/cm3.

Different ratios of atoms produce different compounds.

The three naturally occurring isotopes of magnesium are 24Mg (23.985042 u, 78.99%), 25Mg (24.985837, 10.00%), and 26Mg. What is the atomic mass of 26Mg?

The vertical columns in the periodic table of the elements are called groups.

Atoms retain their identity during a chemical reaction.

Write the symbol for the most common ion formed by sulfur.

Lead-206 has a relative abundance of 23.6%. What size block of lead (in cubic centimeters) will contain 8.34 × 1021 atoms of lead-206? The density of lead is 11.35 g/cm3.

31.0 grams of the element phosphorus contain:

24.9 g of Mn is equivalent to how many moles of Mn?

What is the mass in grams of 1 atom of sulfur (atomic mass = 32.066)?

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

How many atoms of sulfur are in 280 g of a 50% by mass H₂SO₄ solution?

How many atoms of silicon are contained in 8.50 × 10^-5 grams?

Lead-206 has a relative abundance of 23.6%. What size block of lead (in cubic centimeters) will contain 8.34 × 10²¹ atoms of lead-206? The density of lead is 11.35 g/cm3.