November IL,0 Name In the solid state, cohesive forces are a. roughly of the sam
ID: 558289 • Letter: N
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November IL,0 Name In the solid state, cohesive forces are a. roughly of the same magnitude as disruptive forces b. very weak compared to disruptive forces c. dominant over disruptive forces d. None of These 1. 2. In the liquid state, cohesive forces are a. roughly of the same magnitude as disruptive forces b. very weak compared to disruptive forces c. dominant over disruptive forces d. None of These 3. Describe the relationship between boiling point and the following a. Strength of Intermolecular Forces b. Elevation 4. In which of the following liquids would London forces be the predominant intermolecular force? a. H2O b. H2S c. cCl4d. None of These 5. In which of the following liquids would Hydrogen Bonding be the predominant intermolecular force a. HCN b. HCI c. HBr d. None of These A non-volatile liquid would a. have weak attractive forces between molecules c. have a high vapor pressure at room temperature In which of the following pairs of molecules would the first listed member of the pair have a hi boiling point than the second listed member of the pair? a. HBr and HF 6. b. evaporate"quickly" at room Temp d. None of These 7. b. HCl and H2O Cc. H20 and BrC d. No correct response 8. Complete the following Table Change of State Gas to Solid Name Endothermic or Ex Gas to Liquicd Between the compounds CIF and IF, state which one would have the higher boiling point. Expl for your choice. 9.Explanation / Answer
(1)
In solid state, cohesive forces are dominant over disruptive forces, this is why the atoms remain very close to each other.
(2)
In liquid state, cohesive forces are roughly of same magnitude as disruptive forces, this is why the atoms remain close, but not so close as in case of solids, this is why the shape of a liquid can be changed according to the vessel in which it is poured in.
(3)
If the strength of intermolecular forces is very high in a liquid, then the boiling point is also very high because it will take more heat energy to vaporise the molecules and tear them apart in the gas state.
As the elevation increases, the atmospheric pressure decreases, due to which the liquid will start boiling soon, hence the boiling point will also be less. So greater the elevation, lower is the boiling point.
(4)
The London forces would not be dominant forces in any of the given molecules, because in H2O, H2S as well as CCl4, the dominant forces are the dipole interactions.
Hope this helps !
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