Unit 3 Part 2 LM Questions

What is the main cause of non-ideality in gases?

•   Attractions between gas molecules.

•   The individual volumes of each gas molecule.

•   High temperatures that rip electrons from atoms.

•   Gases are ideal.

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LM 43

Both intra- and intermolecular forces are considered what kind of attraction?

• Gravitational

•   Coulombic

•   Nuclear

•   None of these answers

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LM 43

Which of the following is considered an intramolecular bond?

•   Hydrogen bond

•   Polar covalent bond

•   Dipole-dipole bond

•   Van der Waal's forces

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LM 43

Which of the following is true regarding the origin of dipole forces between molecules?

•   They result from interactions between highly electronegative atoms like nitrogen, oxygen, and fluorine attached to hydrogen.

•   They result from the attraction of the permanent positive and negative ends of separate polar molecules.

•   The result from the attraction of temporary regions of positive and negative charges that arise in the molecules.

•   They result from the attraction between positive and negative ions.

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LM 43

The strength of dipole interactions are mostly determined by what?

•   The difference in electronegativity between the two bonded atoms.

•   The difference in sizes between the two bonded atoms.

•   The difference in the phase the bonded molecule is in.

•   Highly electronegative atoms like nitrogen, oxygen, and fluorine directly bonded to hydrogen.

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LM 43

Which of the following energies would be comparable to the energy contained in a hydrogen bond?

•   22 kJ/mol

•   2 kJ/mol

•   150 kJ/mol

•   600 kJ/mol

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LM 43

Why is ionic bonding considered both inter- and intramolecular bonding?

•   Once a salt is dissolved in water, the individual cations and anions can form IMFs with surrounding molecules.

•   Ionic solids form directly from gases one atom at a time.

•   Ionic bonds are strictly intermolecular forces.

•   Ionic bonds are strictly intramolecular bonds. Each lattice is a single large molecule of some substance.

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LM 43

All of the following are intermolecular forces exist in different types of molecular compounds. Which of the following exists in all molecules?

•   Dispersion forces

•   Dipole-dipole

•   Ion-dipole

•   Hydrogen bonding

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LM 43

What is the approximate energy contained in a dipole-dipole intermolecular interaction?

•   15 kJ/mol

•   1 kJ/mol

•   200 kJ/mol

•   1500 kJ/mol

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LM 44

Which of the following has a permanent dipole?

BF₃, CF₄, PF₃

•   BF₃

• PF₃

•   CF₄

•   All of these have permanent dipoles.

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LM 44