Question 1

Which of the following statements concerning isotopes is true?

Accepted Answer

A)  All isotopes of a given element are radioactive. 
B)  Various isotopes of the same element exhibit very different chemical reactivity. 
C)  Various isotopes of the same element have the same number of protons. 
D)  Every element has 3 isotopes. 
E)  Various isotopes of the same element have the same mass. 
A)  All isotopes of a given element are radioactive. 
B)  Various isotopes of the same element exhibit very different chemical reactivity. 
C)  Various isotopes of the same element have the same number of protons. 
D)  Every element has 3 isotopes. 
E)  Various isotopes of the same element have the same mass.

Question 2

Which of the following statements is not true?

Accepted Answer

A)    contains 53 neutrons. 
B)    has an atomic number of 23. 
C)    has the same number of protons, neutrons and electrons. 
D)    has the same number of electrons and protons. 
E)    has the same number of neutrons and protons. 
A)    contains 53 neutrons. 
B)    has an atomic number of 23. 
C)    has the same number of protons, neutrons and electrons. 
D)    has the same number of electrons and protons. 
E)    has the same number of neutrons and protons.

Question 3

An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310). Calculate the atomic weight of the element.

Accepted Answer

A)  28.09 amu 
B)  66.94 amu 
C)  86.93 amu 
D)  28.98 amu 
E)  83.93 amu 
A)  28.09 amu 
B)  66.94 amu 
C)  86.93 amu 
D)  28.98 amu 
E)  83.93 amu

Question 4

Give an example of an isotope symbol and describe what the features of the symbol specify.

Accepted Answer

@#IMG-DLM& This isotope symbol is for the atom Sul

Question 5

What is the proper answer and number of significant figures for the following calculation: 0.421 + 7.70/12.245?

Accepted Answer

A)  0.663 
B)  0.6632 
C)  1.0498 
D)  1.05 
E)  1.050 
A)  0.663 
B)  0.6632 
C)  1.0498 
D)  1.05 
E)  1.050

Question 6

Which element can be classified as a halogen?

Accepted Answer

A)  He 
B)  H 
C)  O 
D)  Cl 
E)  La 
A)  He 
B)  H 
C)  O 
D)  Cl 
E)  La

Which of the following statements concerning isotopes is true?

Which of the following statements is not true?

An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310). Calculate the atomic weight of the element.

Give an example of an isotope symbol and describe what the features of the symbol specify.

What is the proper answer and number of significant figures for the following calculation: 0.421 + 7.70/12.245?

Which element can be classified as a halogen?

The Nature of Chemistry

Chemical Compounds

Quantities of Reactants and Products

Chemical Reactions

Energy and Chemical Reactions

Electron Configurations and the Periodic Table

Covalent Bonding

Molecular Structure

Gases and the Atmosphere

Liquids, Solids, and Materials

Chemical Kinetics: Rates of Reactions

Chemical Equilibrium

The Chemistry of Solutes and Solutions

Acids and Bases

Additional Aqueous Equilibria

Thermodynamics: Directionality of Chemical Reactions

Electrochemistry and Its Applications

Nuclear Chemistry

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Exam 2: Atoms and Elements

Which of the following statements concerning isotopes is true?

Which of the following statements is not true?

An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310). Calculate the atomic weight of the element.

Give an example of an isotope symbol and describe what the features of the symbol specify.

What is the proper answer and number of significant figures for the following calculation: 0.421 + 7.70/12.245?

Which element can be classified as a halogen?

The Nature of Chemistry

Chemical Compounds

Quantities of Reactants and Products

Chemical Reactions

Energy and Chemical Reactions

Electron Configurations and the Periodic Table

Covalent Bonding

Molecular Structure

Gases and the Atmosphere

Liquids, Solids, and Materials

Chemical Kinetics: Rates of Reactions

Chemical Equilibrium

The Chemistry of Solutes and Solutions

Acids and Bases

Additional Aqueous Equilibria

Thermodynamics: Directionality of Chemical Reactions

Electrochemistry and Its Applications

Nuclear Chemistry

Filters