1 Which of the following statements correctly describe the normal boiling point of a liquid?

1. It is the same temperature everywhere on the Earth
2. It depends on the attractive forces between the particles (molecules, ions or atoms) of which the substance is composed.
3. It is the temperature at which the vapor pressure of the liquid equals 1 atm
4. No molecule ( or ion or atom) of liquid becomes gaseous until the liquid boils.

2. At 20°C and 1 atm, in which state do the particles making up a sample occupy the smallest percent of the total volume?

3. In which is the average kinetic energy of the particles proportional to the Kelvin temperature?

4. At 20°C and 1.0 atm, in which state would you expect to find calcium chloride?

5. Which substance melts at - 91C?

6. How many are solids at room temperature (20°C)?

7. The specific heat of silver is 0.238 J/g°C. How much energy is needed to raise the temperature of 1.5 g silver from 22°C to 91°C?

8. The postulates of the kinetic molecular theory for gases are:

1. Molecules have no effective volume.
2. There are no attractive forces between molecules.
3. All collisions between molecules are elastic.
4. Molecules are in constant, straight-line motion.
5. The average kinetic energy of the molecules is proportional to the Kelvin temperature of the sample.

Which of these postulates are true of a molecular liquid?

9. The normal boiling point of benzene is 80.1°C. At 0.85 atm, benzene will boil at a temperature:

10. Energy is added to 100 g water at -5 C unitl the temperature of the sample is 200°C. The physical constants of water involved in this change are:

Specific heat (solid) = 2.05 J/g°C
Specifc heat(liquid) = 4.18 J/g°C
Specific heat(gas) = 2.01 J/g°C
Molar heat of fusion = 6.02 kJ/mol
Molar heat of vaporization = 40.7 kJ/mol

Which of the following steps will require the largest amount of energy?