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Here are the answers to the 2021 Questions for IMF and Physical Properties.
1) London Dispersion Forces (LDS) - Note: every substance including atoms exert LDS but most also exert other IMF that are so strong that LDS contribution is insignificant.
2) Miscible (or immiscible)
3) Vapor
4) Dipole-Dipole (DD) and Hydrogen Bonding (HB)
5) Gas phase
6) Like dissolve likes. Polar/ionic substance will dissolve polar/ionic substance. Non-polar molecules can only dissolve non-polar molecules.
7) Carbon monoxide is a polar molecule and methane is a non-polar molecules so they will not dissolve in each other.
8) No, Basic particles of the solute go in the empty space between the base particle of the solvent particle until there is no more empty space.
9) Base partoccupy empty space between base particle of the solvent.
10) No, the IMF of the substance is the same. What is different is the amount of energy the particles have to "push against" the IMF.
11)