Editing Answers To 2021 Questions For IMF And Physical Properties

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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, Solute particles go into Empty space between Solvent particles. 
 
9) Base particles of solute occupy 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) Metal/ionic, polar molecule, non-polar molecule. 
 
12) Octane (C8H18) has higher IMF since it has more electron thereby having more Instantaneous dipoles. Since octane has a higher IMF, it will require more energy for particles to overcome their IMF and go in gas phase (called boiling). So, hexane will "boil first". 
 
13) For your knowledge, NH3 will have a higher IMF since it has 3 hydrogen bonds per molecule. (In reality, it is H2O even though it only has two hydrogen bonds, H - O polar bond exert more IMF than H - N). 
 
14) Yes (note: for most substance there are other IMF that are stronger so LDS do not play a major role. Of course, major exception is non-polar molecules).

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