INTERMOLECULAR FORCES Answer each of the following questions by ind the appropri

Question

INTERMOLECULAR FORCES Answer each of the following questions by ind the appropriate intermolecular force. (a) One exampie of a hydrated salt is CuSO, 5H What kind of force is responsible for bindine bmdin g water molecuies to the copper ions of the co fate? (b) What type of intermoiecular forces-must be oy come to: (1) melt ice; (2) melt solid I,: (3) dissoive NaCl in water, or (4) convert NH, from liquid to vapor? Rank the following in order of increasing strength of intermolecular forces in the pure substances. and in- dicate which ones are most likely to exist as gases at 25°C and 1 atm: KI. Ne. CH.. CO. MgSO.. To melt an ionic solid. energy must be suppiied to disrupt the forces between the ions so that the reguiar array of ions collapses. loses order. and becomes a iquid. If the distance between anion and cation in a crystalline solid is decreased (and the ion charges remain the same). is the melhting point expected to increase or decrease? Why? 20. Considering intermolecuiar forces. which compound in the folilowing pairs of ionic.compounds should have the higher melting point: (a) NaCl or RbCl: (b) Ba0 or MgO: (c) NaCI or MgCl.? 21. Which of the following compounds would be expected to form hydrogen bonds with water: (a) CH,-O-CH (b) CH., (c) HF, (d) HCOOH, (e) I2, (f) CH,OH? proportions. Draw molecular structures showing how water and alcohol interact. What type of intermolec- ular force is involved?

Explanation / Answer

19.

Ne < CH4 < CO < KI < MgSO4

Ne, CH4 and CO are gases.

20.

(a) RbCl

(b) BaO

(c) MgCl2

21.

(a) CH3OCH3

(c) HF

(d) HCOOH

(f) CH3OH

22.

Intermolecular hydrogen bonding can be formed in between ethyl alcohol and water molecules.

H2O ------ H-CH2OH

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