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The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?


A) Ca2+(s) + 2F¯(g) →\rightarrow CaF2(g)
B) CaF2(g) →\rightarrow CaF2(s)
C) Ca(g) + 2F(g) →\rightarrow CaF2(s)
D) CaF2(aq) →\rightarrow CaF2(s)
E) None of these choices is correct.

F) A) and B)
G) None of the above

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


A) lattice energy.
B) network attractions.
C) ionic bonding.
D) covalent bonding.
E) metallic bonding.

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

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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

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

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Arrange aluminum, nitrogen, phosphorus and indium in order of increasing electronegativity.


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

F) B) and C)
G) A) and C)

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Electronegativity is a measure of


A) the energy needed to remove an electron from an atom.
B) the energy released when an electron is added to an atom.
C) the magnitude of the negative charge on an electron.
D) the attraction by an atom for electrons in a chemical bond.
E) the magnitude of the negative charge on a molecule.

F) A) and C)
G) A) and B)

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Give a clear and concise definition of the term "electronegativity"; i.e., what does it measure?

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Electronegativity measures an ...

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The diameter of a chloride ion is 362 pm, and the diameter of a potassium ion is 276 pm. What is the distance between the nuclei of adjacent chloride and potassium ions in solid potassium chloride?


A) 1276 pm
B) 638 pm
C) 319 pm
D) 181 pm
E) 138 pm

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

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The lattice energy is the energy released when separated ions in the gas phase combine to form ionic molecules in the gas phase.

A) True
B) False

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When one mole of each of the following liquids is burned, which will produce the most heat energy?


A) C6H14
B) C5H12
C) C6H14O
D) C6H12O
E) C6H10O3

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

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Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because


A) fats contain more bonds to oxygen than carbohydrates.
B) fats contain fewer bonds to oxygen than carbohydrates.
C) the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the carbon-oxygen and oxygen-hydrogen bonds in the reaction products (carbon dioxide and water) .
D) the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the bonds in carbohydrates.
E) fats have higher molar masses than carbohydrates.

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

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

A) True
B) False

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Bond energy increases as bond order increases, for bonding between a given pair of atoms.

A) True
B) False

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A single covalent bond consists of a single delocalized electron pair.

A) True
B) False

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Select the correct formula for a compound formed from barium and nitrogen.


A) BaN
B) BaN2
C) Ba2N3
D) Ba2N
E) Ba3N2

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

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Select the strongest bond in the following group.


A) C Select the strongest bond in the following group. A) C S B) C O C) C C D) C N E) C F S
B) C Select the strongest bond in the following group. A) C S B) C O C) C C D) C N E) C F O
C) C Select the strongest bond in the following group. A) C S B) C O C) C C D) C N E) C F C
D) C Select the strongest bond in the following group. A) C S B) C O C) C C D) C N E) C F N
E) C Select the strongest bond in the following group. A) C S B) C O C) C C D) C N E) C F F

F) A) and E)
G) A) and B)

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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?H °\degree for the reaction written below, using the bond energies given. Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?H \degree for the reaction written below, using the bond energies given. A) -969 kJ B) -204 kJ C) -105 kJ D) 204 kJ E) 595 kJ Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?H \degree for the reaction written below, using the bond energies given. A) -969 kJ B) -204 kJ C) -105 kJ D) 204 kJ E) 595 kJ


A) -969 kJ
B) -204 kJ
C) -105 kJ
D) 204 kJ
E) 595 kJ

F) A) and B)
G) B) and D)

Correct Answer

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Using the bond energies provided below, calculate ?H °\degree for the reaction Using the bond energies provided below, calculate ?H \degree for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol A) 1422 kJ B) 440 kJ C) 110 kJ D) -110 kJ E) -440 kJ Bond energies: C Using the bond energies provided below, calculate ?H \degree for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol A) 1422 kJ B) 440 kJ C) 110 kJ D) -110 kJ E) -440 kJ H = 413 kJ/mol, Cl Using the bond energies provided below, calculate ?H \degree for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol A) 1422 kJ B) 440 kJ C) 110 kJ D) -110 kJ E) -440 kJ Cl = 243 kJ/mol, C Using the bond energies provided below, calculate ?H \degree for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol A) 1422 kJ B) 440 kJ C) 110 kJ D) -110 kJ E) -440 kJ Cl = 339 kJ/mol, H Using the bond energies provided below, calculate ?H \degree for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol A) 1422 kJ B) 440 kJ C) 110 kJ D) -110 kJ E) -440 kJ Cl = 427 kJ/mol


A) 1422 kJ
B) 440 kJ
C) 110 kJ
D) -110 kJ
E) -440 kJ

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

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When an atom is represented in a Lewis electron dot symbol, the element symbol represents the ______________ and the dots represent the ______________.

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nucleus an...

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In not more than three sentences, describe the electron arrangement responsible for bonding in solid SrCl2.

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This is an example of ionic bonding in w...

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No real bonds are 100% ionic in character.

A) True
B) False

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