Environmental Engineering Exam #1 – Study Guide, Review & Practice Questions
ppm - ANS ✔✔mg/L ; unit of concentration
ppm(v) - ANS ✔✔concentrations in air, use ideal gas law
ThOD - ANS ✔✔stoichiometric oxygen requirement for oxidation (mg/L)
conserved system - ANS ✔✔no rxn
steady state system - ANS ✔✔no accum
zero order - ANS ✔✔r(C)=k; k=mass/(volume*time)
first order - ANS ✔✔r(C)=kC; k=1/time
second order - ANS ✔✔r(C)=kC^2; k=volume/(mass*time)
Dissociation Constant (Ka) - ANS ✔✔partitioning between ions dissociated in solution; pure
water cancels out of equilibrium equation
Solubility Product (Ksp) - ANS ✔✔partitioning between soil and liquid phase; pure solids cancel
out of equilibrium equation
Henry's Constant (Kh) - ANS ✔✔partial pressure is proportional to volume of the gas in air; K=
mol*atm/L
ppm - ANS ✔✔mg/L ; unit of concentration
ppm(v) - ANS ✔✔concentrations in air, use ideal gas law
ThOD - ANS ✔✔stoichiometric oxygen requirement for oxidation (mg/L)
conserved system - ANS ✔✔no rxn
steady state system - ANS ✔✔no accum
zero order - ANS ✔✔r(C)=k; k=mass/(volume*time)
first order - ANS ✔✔r(C)=kC; k=1/time
second order - ANS ✔✔r(C)=kC^2; k=volume/(mass*time)
Dissociation Constant (Ka) - ANS ✔✔partitioning between ions dissociated in solution; pure
water cancels out of equilibrium equation
Solubility Product (Ksp) - ANS ✔✔partitioning between soil and liquid phase; pure solids cancel
out of equilibrium equation
Henry's Constant (Kh) - ANS ✔✔partial pressure is proportional to volume of the gas in air; K=
mol*atm/L