Practice Exams ChE - 2

1. The first step in precipitation is the formulation of _________.
a. nuclei
b. ???
c. ???
d. ???

2. Cr(NH3)5SO4Cl represent ________ atoms.
a. 27 c.
b. 12
c. ???
d. ???

3. The mass contribution of an electron in an atom is
a. 1/1,837 that of the proton
b. equal to that of a proton
c. equal to that of the neutron
d. ???

4. An atom is __________
a. Electrically positive spherical species with a neutral center and negatively charged electron.
b. An electrically positive spherical species with a positive center and negatively charged electron
c. An electrically neutral spherical species with a neutral center and negatively charged electron.
d. An electrically negative spherical species with a positively charged center and negatively charged elections.

5. Along a row in the periodic table elements have the same
a. energy
b. configuration
c. size
d. ???

6. The electrons of metals are free to move in a solid. This explains why
a. metals are unstable
b. metals can be easily molded
c. metals have high reflectivity
d. metals have high conductivity

7. A 4.256 grams compound is dissolved in 100 grams toluene. What is the molecular weight (MW) of the compound if the vapor pressure of the solution in 28.209? The vapor pressure of toluene at the working temperature is 28.829 mmHg. Assume that the compound is a nonvolatile, non-dissociating solute.

8. A flue gas is analyzed to contain (dry basis): 11.6% CO2, 6.8% O2, 0.5% CO and leaves the boiler at 5380K. The inlet air is at 2870K and the fuel contains 29.4% C. What is the amount of heat carried by the flue gas per kg of fuel burnt? The mean heat capacity of the flue gas is 1.005 kJ/kg 0K.

9. Which of the following represents reduction?
a. ethanol ---> ethanaldehyde
b. acetylene ---> ethylene
c. ???
d. ???

10. What are the products of destructive distillation?
a. coal tar, coal gas, ammonia
b. coal gas, ammonia, graphite
c. ???
d. ???


Post a Comment

  © Blogger template The Professional Template by 2008

Back to TOP