ACS CP ACS CP Industrial & Process Chemistry 2

Question 1

In chemical engineering, 'selectivity' in a reactor refers to:

Accepted Answer

The fraction of converted reactant that forms the desired product relative to all products

Answer

Selectivity is the fraction of converted starting material that yields the desired product versus all products formed, distinguishing it from yield (which also accounts for conversion).

Question 2

Process safety management (PSM) under OSHA 29 CFR 1910.119 applies to facilities that:

Accepted Answer

Handle highly hazardous chemicals above specified threshold quantities

Answer

OSHA PSM applies to processes involving highly hazardous chemicals at or above specified threshold quantities listed in Appendix A of 29 CFR 1910.119.

Question 3

Which type of reactor achieves uniform concentration and temperature throughout its volume at steady state?

Accepted Answer

Continuous stirred tank reactor (CSTR)

Answer

The CSTR (also called a backmix reactor) operates with perfect mixing, resulting in uniform composition and temperature equal to the exit stream conditions throughout the vessel.

Question 4

In the chlor-alkali process, which products are co-produced at the anode and cathode respectively?

Accepted Answer

Chlorine at anode; sodium hydroxide and hydrogen at cathode

Answer

Electrolysis of brine (NaCl solution) produces Cl2 gas at the anode (oxidation of Cl⁻) and NaOH + H2 at the cathode (reduction of water).

Question 5

The Lower Explosive Limit (LEL) and Upper Explosive Limit (UEL) define:

Accepted Answer

The concentration range of a flammable gas/vapor in air that can sustain combustion

Answer

LEL and UEL define the flammable range — the concentration limits (% by volume in air) within which a fuel-air mixture can ignite and propagate a flame.

(ACS CP) American Chemical Society (ACS) Certified Professional Practice Test

(ACS CP) American Chemical Society (ACS) Certified Professional Practice Test

ACS CP ACS CP Industrial & Process Chemistry 2