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The majority of elements are good electrical conductors when in solid form.

A) True
B) False

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The more C The more C O and O H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned. O and O The more C O and O H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned. H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

A) True
B) False

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

A) True
B) False

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Which of the following elements is the most electronegative?


A) S
B) Ru
C) Si
D) Te
E) Cs

F) C) and D)
G) A) and E)

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Select the most polar bond amongst the following.


A) C Select the most polar bond amongst the following. A) C O B) Si F C) Cl F D) C F E) C I O
B) Si Select the most polar bond amongst the following. A) C O B) Si F C) Cl F D) C F E) C I F
C) Cl Select the most polar bond amongst the following. A) C O B) Si F C) Cl F D) C F E) C I F
D) C Select the most polar bond amongst the following. A) C O B) Si F C) Cl F D) C F E) C I F
E) C Select the most polar bond amongst the following. A) C O B) Si F C) Cl F D) C F E) C I I

F) None of the above
G) C) and D)

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Select the element whose Lewis symbol is correct.


A) Select the element whose Lewis symbol is correct. A) B) C) D) E)
B) Select the element whose Lewis symbol is correct. A) B) C) D) E)
C) Select the element whose Lewis symbol is correct. A) B) C) D) E)
D) Select the element whose Lewis symbol is correct. A) B) C) D) E)
E) Select the element whose Lewis symbol is correct. A) B) C) D) E)

F) A) and E)
G) C) and D)

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A hypothetical ionic substance will not form merely because it has a high lattice energy. Explain why, using energy-based arguments.

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In order for an ionic substance to form,...

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As a measure of the strength of metallic bonding, the boiling point of a metal is a better indicator than its melting point.

A) True
B) False

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Using appropriate, real examples to illustrate your answer, describe the correlation between bond energy and bond length for a series of varying bond order.

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Carbon and oxygen form single, double an...

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Describe, with appropriate explanations, the key factors which affect the magnitude of the lattice energy of an ionic substance.

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By Coulomb's law, the energy of two elec...

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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?


A) NaCl
B) Si
C) CCl4
D) I2
E) Ga

F) B) and C)
G) D) and E)

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Select the compound with the highest (i.e., most negative) lattice energy.


A) CaS(s)
B) BaO(s)
C) NaI(s)
D) LiBr(s)
E) MgO(s)

F) D) and E)
G) A) and C)

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Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules?


A) low melting point
B) low boiling point
C) weak bonds
D) poor electrical conductor when solid
E) poor electrical conductor when molten

F) A) and C)
G) D) and E)

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The melting points of metals are only moderately high because


A) metallic bonding is weak.
B) metals have fewer bonding electrons than non-metals.
C) metals also have relatively low boiling points.
D) the melting process does not break the metallic bonds.
E) metals prefer to be bonded to non-metals.

F) A) and D)
G) A) and E)

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Which of the following elements is the least electronegative?


A) Si
B) Se
C) S
D) Sc
E) Sr

F) B) and E)
G) C) and D)

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Which of the following contains covalent bonds?


A) BaO
B) IBr
C) Mg
D) LiBr
E) Cu

F) C) and E)
G) C) and D)

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Covalently bonded substances do not necessarily exist as separate molecules.

A) True
B) False

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


A) Mg(s) + Cl2(g) →\rightarrow MgCl2(s)
B) Mg(g) + 2Cl(g) →\rightarrow MgCl2(s)
C) Mg2+(s) + 2Cl¯(g) →\rightarrow MgCl2(g)
D) Mg2+(g) + 2Cl¯(g) →\rightarrow MgCl2(s)
E) MgCl2(aq) →\rightarrow MgCl2(s)

F) D) and E)
G) A) and E)

Correct Answer

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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


A) the bond energy.
B) the bond length.
C) the molecular diameter.
D) the covalent radius.
E) the covalent diameter.

F) A) and D)
G) A) and C)

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The lattice energy of rubidium chloride is the energy change accompanying the process Rb+(g) + Cl-(g) →\rightarrow RbCl(s) Calculate the lattice energy of RbCl using the following data: The lattice energy of rubidium chloride is the energy change accompanying the process Rb<sup>+</sup>(g) + Cl<sup>-</sup>(g) \rightarrow RbCl(s) Calculate the lattice energy of RbCl using the following data:

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Lattice en...

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