Question 1

The atomic mass interval for carbon is given as [ 12.0096;12.0116 ].Which of the below statements is correct regarding this atomic mass interval?

Accepted Answer

A) 12.0106 represents the most likely value of the atomic mass of carbon 
B) 0.00207 represents the uncertainty in the value of atomic mass of carbon 
C) The upper and lower bound of the atomic weight interval are based on the periodic table 
D) This interval indicates that the atomic mass of carbon would not be lower than 12.0096 and it would not be higher than 12.0116 
A) 12.0106 represents the most likely value of the atomic mass of carbon 
B) 0.00207 represents the uncertainty in the value of atomic mass of carbon 
C) The upper and lower bound of the atomic weight interval are based on the periodic table 
D) This interval indicates that the atomic mass of carbon would not be lower than 12.0096 and it would not be higher than 12.0116

Question 2

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 3

Calculate the percent abundance of the two isotopes of a fictional element,georgium,if it has an average atomic mass of  
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 4

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 5

The following ratios of masses were obtained with a mass spectrometer:
 
What is the mass of a  Cl atom in atomic mass units?

Accepted Answer

A) 35.45 u 
B) 36.36 u 
C) 13.95 u 
D) 35.00 u 
E) 34.97 u 
A) 35.45 u 
B) 36.36 u 
C) 13.95 u 
D) 35.00 u 
E) 34.97 u

Question 6

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 7

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 g/cm3 
B) 169 g/cm3 
C) 3.28 g/cm3 
D) 0.0142 g/cm3 
E) 7.29 g/cm3 
A) 0.00729 g/cm3 
B) 169 g/cm3 
C) 3.28 g/cm3 
D) 0.0142 g/cm3 
E) 7.29 g/cm3

Question 8

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

Accepted Answer

A) 0.0107 cm3 
B) 0.253 cm3 
C) 1.07 cm3 
D) 0.330 cm3 
E) 12.1 cm3 
A) 0.0107 cm3 
B) 0.253 cm3 
C) 1.07 cm3 
D) 0.330 cm3 
E) 12.1 cm3

Question 9

Which of the following statements is true concerning the masses of individual Cl atoms?

Accepted Answer

A) All atoms have a mass of 35.45 u. 
B) Most of the atoms have a mass of 35.45 u. 
C) Some of the atoms have a mass of 35.45 u. 
D) None of the atoms have a mass of 35.45 u. 
E) All atoms have a mass of 17 u. 
A) All atoms have a mass of 35.45 u. 
B) Most of the atoms have a mass of 35.45 u. 
C) Some of the atoms have a mass of 35.45 u. 
D) None of the atoms have a mass of 35.45 u. 
E) All atoms have a mass of 17 u.

Question 10

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

Accepted Answer

A) S1- 
B) S2-  
C) S1+  
D) S2+  
E) requires experimental data 
A) S1- 
B) S2-  
C) S1+  
D) S2+  
E) requires experimental data

Question 11

Rubidium possesses two stable forms and has an average mass of 85.5.85Rb has a mass of 84.9 and a percent abundance of 72.2%.What is the mass of the other form of Rb?

Accepted Answer

A) 86.1 u 
B) 85.7 u 
C) 88.3 u 
D) 87.1 u 
E) 89.4 u 
A) 86.1 u 
B) 85.7 u 
C) 88.3 u 
D) 87.1 u 
E) 89.4 u

Question 12

Which of the following is a correct feature of the nuclear atom proposed by Rutherford?

Accepted Answer

A) All atoms of an element have the same mass. 
B) The atom is mostly empty space. 
C) The number of neutrons and electrons in the atom are equal. 
D) The majority of alpha particles to strike the foil "bounced back." 
E) It is like the "plum pudding" model. 
A) All atoms of an element have the same mass. 
B) The atom is mostly empty space. 
C) The number of neutrons and electrons in the atom are equal. 
D) The majority of alpha particles to strike the foil "bounced back." 
E) It is like the "plum pudding" model.

Question 13

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 14

The total number of neutrons in an  
Is ________.

Accepted Answer

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

Question 15

What is the thickness in mm of the sheet  
Formed by  
Atoms of lead? The density of lead is 11.35 g/cm3.

Accepted Answer

A) 9.10 mm 
B) 0.0910 mm 
C) 1.88 × 104 mm 
D) 0.273 mm 
E) 2.73 mm 
A) 9.10 mm 
B) 0.0910 mm 
C) 1.88 × 104 mm 
D) 0.273 mm 
E) 2.73 mm

Question 16

Sodium is a member of the family called ________.

Accepted Answer

A) alkali metals 
B) earth alkali metals 
C) metalloids 
D) actinide metals 
E) transition metals 
A) alkali metals 
B) earth alkali metals 
C) metalloids 
D) actinide metals 
E) transition metals

Question 17

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

Question 18

Magnesium has 3 stable isotopes with masses of 23.98504,24.98584,and 25.98259 respectively.Mg-25 is 10.13%.What are the percentages of the other two isotopes?

Accepted Answer

A) 78.8% and 10.9% 
B) 50% and 50% 
C) 44.9% and 44.9% 
D) 83.6% and 16.4% 
E) 78.9% and 21.1% 
A) 78.8% and 10.9% 
B) 50% and 50% 
C) 44.9% and 44.9% 
D) 83.6% and 16.4% 
E) 78.9% and 21.1%

Question 19

All matter is composed of atoms.

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 2: Atoms and the Atomic Theory

The atomic mass interval for carbon is given as [ 12.0096;12.0116 ].Which of the below statements is correct regarding this atomic mass interval?

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

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

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.

The following ratios of masses were obtained with a mass spectrometer: What is the mass of a Cl atom in atomic mass units?

Choose the correct statement.

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

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

Which of the following statements is true concerning the masses of individual Cl atoms?

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

Rubidium possesses two stable forms and has an average mass of 85.5.85Rb has a mass of 84.9 and a percent abundance of 72.2%.What is the mass of the other form of Rb?

Which of the following is a correct feature of the nuclear atom proposed by Rutherford?

Choose the INCORRECT statement.

The total number of neutrons in an Is ________.

What is the thickness in mm of the sheet Formed by Atoms of lead? The density of lead is 11.35 g/cm3.

Sodium is a member of the family called ________.

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.

Magnesium has 3 stable isotopes with masses of 23.98504,24.98584,and 25.98259 respectively.Mg-25 is 10.13%.What are the percentages of the other two isotopes?

All matter is composed of atoms.

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?

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: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

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.

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

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

Rubidium possesses two stable forms and has an average mass of 85.5.⁸⁵Rb has a mass of 84.9 and a percent abundance of 72.2%.What is the mass of the other form of Rb?

What is the thickness in mm of the sheet Formed by Atoms of lead? The density of lead is 11.35 g/cm³.

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.

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?