Physical Chemistry

Question 1

The vapor pressure of a liquid

A. Always increases with temperature
B. Always decreases with temperature
C. Is independent with temperature
D. None of these

Answer 1

A. Always increases with temperature

Question 2

For a chemical reaction in a state of equilibrium, a decrease in temperature will

A. Favor the reaction that is exothermic
B. Favor the reaction that is endothermic
C. Have no effect on the system
D. Increase the equilibrium constant of the system

Answer 2

A. Favor the reaction that is exothermic

Question 3

When gaseous ammonia is dissolved in water, the resulting solution does not obey Henry’s Law. Which of the following best explains why this solution does not obey Henry’s Law?

A. All of the NH3 that initially dissolves in water rapidly escapes from the solution because NH3 is a gas at a room temperature
B. NH3 reacts with the solvent to produce ammonium and hydroxide ions
C. NH3 is not soluble in water because it is a non-polar molecule
D. The hydrogen bonding between ammonia molecules is so strong that NH3 cannot be dissolved in water.

Answer 3

B. NH3 reacts with the solvent to produce ammonium and hydroxide ions

Question 4

The law relating the solubility of the gas to its pressure is called

A. Raoult’s Law
B. Distribution Law
C. Henry’s Law
D. Arrhenius’ Law

Answer 4

C. Henry’s Law

Question 5

Which of the following exists as a gas at room temperature?

A. Br2
B. Ga
C. I2
D. None of these

Answer 5

A. Br2

Question 6

Which of the following exists as a liquid at room temperature?

A. Br2
B. Ga
C. I2
D. None of these

Answer 6

C. I2

Question 7

If a given gas has a compressibility factor, Z > 1, this means that ____ exists between the molecules of gases.

A. Attractive forces
B. Repulsive forces
C. Negligible forces of attraction
D. Negligible repulsive

Answer 7

B. Repulsive forces

Question 8

What happens to the molecules in a liquid when the liquid is heated and vapor starts to form?

A. The intramolecular forces between liquid molecules are disrupted
B. The intermolecular forces between liquid molecules are disrupted
C. Kinetic energy is removed from the system
D. London forces becomes stronger

Answer 8

B. The intermolecular forces between liquid molecules are disrupted

Question 9

All the half-cell potential (E°) use the ___ as the reference

A. Hydrogen electrode
B. Oxygen half-cell
C. Carbon half-cell
D. Arbitrary net zero point

Answer 9

A. Hydrogen electrode

Question 10

The freezing point depression of aqueous solutions A, B, and C are -2.3, -1.2, and -4.1, respectively. Predict the boiling point elevation for these solutions, from lowest to highest.

A. A B C
B. C B A
C. B A C
D. C A B

Answer 10

C. B A C

Question 11

A Daniel cell like all simple cells have no ____.

A. Gas electrode
B. Junction
C. Electrolytes
D. Lead plates

Answer 11

B. Junction

Question 12

Dielectric constant is another term for ____.

A. Resistivity
B. Capacitance
C. Relative permittivity
D. Permeability

Answer 12

C. Relative permittivity

Question 13

____ are cells that are not based on aqueous chemistry but are commonly found nowadays.

A. Alkali cells
B. Lithium cells
C. Fuel cells
D. Nickel cadmium cells

Answer 13

B. Lithium cells

Question 14

Fluuds whose viscosity increases with time at constant shear rate

A. Inviscid
B. Rheopectic
C. Thixotropic
D. Pascalian

Answer 14

B. Rheopectic

Question 15

An electrochemical cell in which chemical reaction is force to occur by application of an outside source of energy is

A. Galvanic
B. Electrolytic
C. Electrical
D. Chemical

Answer 15

B. Electrolytic