Exam 3 (3)

Question 1

The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin    in 0.250 L of water at 25°C is ________ atm.            

1. 1.14 × 10-3
2. 1.38
3. 0.0136
4. 13.6
5. 2.45

Question 2

Calculate the freezing point of a solution of 500.0 g of ethylene glycol (C 2H 6O 2) dissolved in 500.0 g of water. K f = 1.86°C/m and K b = 0.512°C/m.        

1. 70.2°C
2. 30.0°C
3. -8.32°C
4. -30.0°C
5. 8.32°C

Question 3

The scattering of light by a collodial dispersion is known as            

1. Brownian motion.
2. micelle repulsion.
3. Tyndall effect.
4. an emulsion
5. an aerosol.

Question 4

Which of the following statements is TRUE?  

1.  In general, the solubility of a solid in water decreases with increasing temperature.
2. The solubility of a gas in water usually increases with decreasing pressure.
3. In general, the solubility of a gas in water decreases with increasing temperature.
4. The solubility of an ionic solid in water decreases with increasing temperature.
5. None of the above statements are true.

Question 5 

Identify the type of solid for AgCl.        

1. networking atomic solid
2. molecular solid
3. metallic atomic solid
4. ionic solid
5. nonbonding atomic solid

Question 6

Identify the type of solid for gold.      

1.  networking atomic solid
2. molecular solid
3. nonbonding atomic solid
4. ionic solid
5. metallic atomic solid

Question 7

Determine ΔH vap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.            

1. 79 kJ/mol
2. 13 kJ/mol
3. 24 kJ/mol
4. 34 kJ/mol
5. 41 kJ/mol

Question 8

Which of the following is a Lewis acid?            

1. CHCl3
2. BCl3
3. CH4
4. NH3
5. None of the above are Lewis acids.

Question 9 

When dissolved in water, which compound is generally considered to be an Arrhenius acid?            

1. NaOH
2. CH3CH2OH
3. CH3CO2H
4. Na2CO3

Question 10 

Determine the [OH  ] concentration in a 0.169 M Ca(OH) 2 solution.            

1. 2.96 × 10-14 M
2. 0.338 M
3. 5.92 × 10-14 M
4. 0.169 M
5. 0.298 M