Practice Exams ChE - 6

1. A colorless aluminum salt, soluble in water which is used in paper industry, tanning and water purification.

2. As water boils, the temperature
a. increases
b. remains constant at 100°C until all is changed to vapor
c. ???
d. ???

3. Saltwater boils at
a. slightly higher than 100°C
b. 100°C
c. slightly lower than 100°C
d. ???

4. Steps in the formation of PVC
a. calcium carbide -- vinyl chloride -- PVC
b. calcium carbide -- acetylene -- vinyl chloride -- PVC
c. ???
d. ???

5. Buffer solution resists changes in acidity. If an acid is added to a buffer solution, the ______ remains the same
a. pH
b. concentration
c. ???
d. ???

Refer to handbook for nos. 6-8
6. specific volume of compressed air at 150 bars and 160°K

7. viscosity of compressed air at 125 bars and 200°K
8. the temperature of compressed air with a specific enthalpy of 50.05 kJ/kg and 70 bars
a. 150°K
b. nearly 160°K

9. An ideal gas in a piston at 5,000 psia expands isothermally against a resisting pressure of 500 psia until its volume is doubled. Find the work done.

10. Jellies and paints are examples of
a. gel
b. emulsion
c. sol
d. ???