Test1

Chapter 10

100

1. What is “vapor pressure”

   1. The pressure exerted by a solid in equilibrium with its liquid at a given temperature 

   2. The pressure exerted by a gas in equilibrium with its liquid phase at a given temperature

   3. The pressure exerted by a liquid in equilibrium with its solid phase at a given temperature 

   4. The pressure of water vapor at any temperature 

The pressure exerted by a gas in equilibrium with its liquid phase at a given temperature

200

1. How does the vapor pressure of a substance change with temperature

   1. When the temperature increases, the vapor pressure increases

   2. When the temperature increases, the vapor pressure decreases

   3. When the temperature increases, the vapor pressure stays the same 

When the temperature increases, the vapor pressure increases

300

1. On a phase diagram, what is the “triple point”?

   1. The temperature and pressure at which the liquid and gas phases have the same density 

   2. The temperature at which three different liquids will boil 

   3. The temperature and pressure where all three phases exist in equilibrium 

   4. The pressure at which 3 L of liquid exerts 3 atm of pressure 

The temperature and pressure where all three phases exist in equilibrium 

400

The vapor pressure of a substance is 21 torr at 300K. Calculate the vapor pressure (in torr) at 310K if the enthalpy of vaporization is 24kj/mol. 

29 torr

500

Oxygen gas (O2) has a partial pressure in the atmosphere of 0.210atm. If the solubility of O2 in water is 2.73x 10-4 M. Calculate the henrys law constant of O2 in water. 

kH=1.30×10−3M/atm

Chapter 11

100

What is the freezing point of water when 24.0 g of glucose (180.0 g/mol) is dissolved in 300.0 g of water? Kf=1.86 C 

-0.83 C

200

What is the freezing point of water when 15.0 g of NaCl (58.44 g/mol) is dissolved in 250.0 g of water?
Assume complete dissociation. Kf=1.86 C

-3.83 C

300

Pure water boils at 100.00°C.
What is the boiling point after dissolving 30.0 g of glucose (180.0 g/mol) in 600.0 g of water?
 Kb=0.512 C

100.14 C

400

Calculate the osmotic pressure of a 0.15 M glucose solution at 25°C.

3.67 atm

500

Calculate the vapor pressure of water at 25°C after dissolving 60.0 g of glucose (180.0 g/mol) in 300.0 g of water.
Pwater=23.8 mmHg

23.3 mmHg

Chapter 13

400

For the reaction:

4NO₂→2N₂O₅+O₂

a) Write the rate expression relating all species.
b) If O₂ is produced at 0.25 M/s, what is the rate of disappearance of NO₂?

Rate NO₂= 1.00 M/s

500

For the reaction:

3A+B→2C

a) Write the rate expression relating the disappearance of A and B to the formation of C.
b) If the rate of formation of C is 0.40 M/s, what is the rate of disappearance of A and B?

Rate A= 0.60 M/s

Rate B=0.20 M/s