1. Place the following substances in order of decreasing boiling point. (3 %) Ne

Question

1. Place the following substances in order of decreasing boiling point. (3 %)

Ne                       Cl2                O2                                          

Place the following compounds in order of decreasing strength of intermolecular forces. (4 %)

CH4                 NH3                 CH3CH2CH3                           CH3CH3

Place the following substances in order of decreasing vapor pressure at a given temperature. (3 %)

BeF2                CH3OH            CH4                                        

Assign appropriate phase transitions for each arrow (4 %)

Explanation / Answer

1. Ne (-246°C) < O2 (-183°C) < Cl (-34°C) Boiling point increases with increasing mol wt or atomic mass.

2. CH4 < CH3CH3 < CH3CH2CH3 < NH3 for CH4 < CH3CH3 < CH3CH2CH3 intermolecular forces decreases with decreasing mol wt.

3. CH4 > CH3OH > BeF2     vapor pressure decreases as boiling point increases

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