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Exam 9: Models of Chemical Bonding

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Question 21

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Arrange aluminum, boron, nitrogen, and phosphorous in order of increasing electronegativity.

A) Al<B<P<N
B) B<Al<N<P
C) Al<N<P<B
D) N<P<B<Al
E) None of these choices are correct.

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Question 22

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Which one of the following properties is least characteristic of typical metals?

A) moderately high melting point
B) high boiling point
C) brittleness
D) good electrical conductor when solid
E) good electrical conductor when molten

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Question 23

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Quartz (SiO₂) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

When two atoms form a covalently-bonded diatomic molecule, the distance between the nuclei at which the potential energy is at a minimum is called

Analysis of an unknown substance showed that it has a moderate melting point and is a good conductor of heat and electricity in the solid phase. Which of the following substances would have those characteristics?

Analysis of an unknown substance showed that it has a high boiling point and is brittle. It is an insulator as a solid but conducts electricity when melted. Which of the following substances would have those characteristics?

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Which of the following contains ionic bonding?

Covalently bonded substances do not necessarily exist as separate molecules.

Based on electronegativity trends in the periodic table, predict which of the following compounds will have the greatest % ionic character in its bonds.

Select the compound with the highest lattice energy.

Which of the following is an ionic compound?

Select the most polar bond amongst the following.

No real bonds are 100% ionic in character.

Arrange oxygen, sulfur, calcium, rubidium, and potassium in order of decreasing electronegativity.

In which of the following processes does the enthalpy change (ΔH) directly represent the magnitude of the lattice energy of KCl(s) ?

The electrostatic energy of two charged particles is inversely proportional to the distance between them.

The lattice energy of MgCl² is the energy change for which one of the following processes?

Which of the following is a covalent compound?

Electronegativities on Pauling's scale are calculated from ionization energies and electron affinities.