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Gases such as oxygen and nitrogen, O_2 and N_2, can be liquefied at low temperatures and high pressure as a result of _____. A) Ion-dipole forces B) Dipole-dipole forces C) Dipole-induced dipole forces D) Hydrogen-bonding E) London Dispersion forces What type of intermolecular forces exist between the molecules shown below: A) London-dispersion force B) Dipole-dipole force D) Ion-dipole force E) Ionic bonding Which of the following physical properties of a liquid depend on the magnitude (size) of its intermolecular force? A) Surface tension B) Capillarity C) Viscosity D) Vapor pressure E) All of these Assume a closed system contains water at constant temperature. Over time we would expect the system _____. A) to do absolutely nothing B) to expand or contract C) to reach a state of dynamic equilibrium D) to be comprised of water in the liquid state only E) to be comprised of water in the gaseous state only
Expert Answer
5. Option E) London dispersion forces is correct
(N2 and O2 both are nonpolar molecules, so there are no dipole- dipole interactions. These molecules don’t count with hydrogen in their structure, so there is no hydrogen bond. London dispersion forces which occur between them are responsible for it.)
6) Option A) London dispersion forces is correct
(Molecule is Benzene .The only London dispersion forces occur between molecules of benzene, because it is a non-polar molecule.
7. Option A) surface tension
The magnitude of the force that controls the shape of the liquid is called the surface tension. The stronger the bonds between the molecules in the liquid, the larger the surface tension will be. )
8. Option A) to do absolutely nothing is correct
(A closed system always contains the same matter; there is no transfer of matter across its boundary. Temperature is constant, so in a closed system no reactants or products can escape.)
