quiz 2

Question 1

What are units of concentration of contaminants in liquids?

Answer 1

mg/L, ppb, mol/L

Question 2

What are units of concentration of contaminants in solids/sludges?

Answer 2

mg/kg, % weight

Question 3

What are units of concentration of contaminants in air?

Answer 3

mg/m^3, ppm by volume, ug/m^3

Question 4

What is the definition of specific gravity of sludge?

Answer 4

Specific gravity of sludge = density of sludge / density of water

Question 5

How does ppm relate with mg/L in dilute solutions?

Answer 5

ppm = mg/L for dilute solutions

Question 6

What does 1% by volume for a contaminant mean

Answer 6

1 part of contaminant per 100 parts of air

Question 7

State the Law of Conservation of Mass

Answer 7

Mass can neither be created nor destroyed

Question 8

Write the general equation for a mass (material) balance of a non-steady-state, non- conservative system

Answer 8

Input rate – output rate – decay rate = accumulation rate

Question 9

For a non-conservative system with a first order decay how is the decay rate expressed

Answer 9

KCV

Question 10

Write the general equation for a mass balance for a steady-state, conservative system

Answer 10

Input rate = output rate