Exam 3 (5)

Question 1

Which of the following statements is TRUE?            

1. Hydrogen bonds are stronger than covalent bonds.
2. Dispersion forces are generally stronger than dipole-dipole forces.
3. Intermolecular forces hold the atoms in molecules together.
4. Vapor pressure increases with temperature.
5. None of the above are true.

Question 2 

Identify the type of solid for AgCl.

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

Question 3

Which of the following statements is FALSE?            

1. Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces.
2. The rate of vaporization increases with increasing surface area.
3. The rate of vaporization increases with decreasing strength of intermolecular forces.
4. The rate of vaporization increases with increasing temperature.
5. None of the above are false.

Question 4 

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

Question 5

A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution. Which statement below is TRUE?            

1. The solution is considered unsaturated.
2. The solution would be considered unsaturated if it were cooled a bit to increase the solubility of the solid.
3. The solution is considered supersaturated.
4. The solution is considered saturated.
5. None of the above are true.

Question 6 

At 20°C, an aqueous solution that is 24.0% by mass in ammonium chloride has a density of    What is the molarity of ammonium chloride in the solution? The formula weight of NH 4Cl is              

1. 5.90
2. 0.479
3. 4.79
4. 0.0445
5. 22.5

Question 7 

The scattering of light by a collodial dispersion is known as        

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

Question 8

Which of the following is TRUE?            

1.  A neutral solution contains [H2O] = [H3O ]
2. An acidic solution has [H3O ] > [OH ]
3. An neutral solution does not contain any H3O+ or OH-
4. A basic solution does not contain H3O+
5. None of the above are true.

Question 9

Which of the following is a Br  nsted-Lowry acid?        

1. NH2-
2. NH3 
3. NH4+ 
4. Br2
5. CH4 

 Question 10

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

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