Question 1

If two different isotopes have the same atomic number,it must mean that

Accepted Answer

A)  they have the same atomic mass. 
B)  they have the same mass number. 
C)  they have the same number of protons. 
D)  they have the same number of electrons. 
E)  they have the same number of neutrons. 
A)  they have the same atomic mass. 
B)  they have the same mass number. 
C)  they have the same number of protons. 
D)  they have the same number of electrons. 
E)  they have the same number of neutrons.

Question 2

The fully hydrated form of sodium sulfate is the decahydrate, Na2SO4. 10H2O.This compound dehydrates (loses some waters of hydration)when heated.A sample of partially dehydrated sodium sulfate was found to have a molar mass of 232.1 g/mol.How many water molecules are found $\underline{\text{  per formula unit }}$  in in this sample? (i.e.determine n in Na2SO4.nH2O).

Accepted Answer

A)  5 waters. 
B)  6 waters. 
C)  7 waters. 
D)  8 waters. 
E)  3 waters. 
A)  5 waters. 
B)  6 waters. 
C)  7 waters. 
D)  8 waters. 
E)  3 waters.

Question 3

What is the molar mass of calcium chloride hexahydrate?

Accepted Answer

A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol 
A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol

Question 4

What is the atomic symbol for an element with 16 protons and 17 neutrons?

Accepted Answer

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

Question 5

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u.The atomic weight of silver is 107.868 u.What is the percent abundance of each isotope?

Accepted Answer

A)  50.0% Ag-107 and 50.0% Ag-109 
B)  51.8% Ag-107 and 48.2% Ag-109 
C)  55.4% Ag-107 and 44.6% Ag-109 
D)  48.2% Ag-107 and 51.8% Ag-109 
E)  44.6% Ag-107 and 55.4% Ag-109 
A)  50.0% Ag-107 and 50.0% Ag-109 
B)  51.8% Ag-107 and 48.2% Ag-109 
C)  55.4% Ag-107 and 44.6% Ag-109 
D)  48.2% Ag-107 and 51.8% Ag-109 
E)  44.6% Ag-107 and 55.4% Ag-109

If two different isotopes have the same atomic number,it must mean that

What is the molar mass of calcium chloride hexahydrate?

What is the atomic symbol for an element with 16 protons and 17 neutrons?

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u.The atomic weight of silver is 107.868 u.What is the percent abundance of each isotope?

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

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Exam 3: Atoms, molecules, and Ions

If two different isotopes have the same atomic number,it must mean that

What is the molar mass of calcium chloride hexahydrate?

What is the atomic symbol for an element with 16 protons and 17 neutrons?

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u.The atomic weight of silver is 107.868 u.What is the percent abundance of each isotope?

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters