quiz 4&5

Question 1

Define the term “chemical reaction rate”

Answer 1

The change in concentration of a chemical over the time it takes for the change to occur

Question 2

Describe what “zero-order reaction rate” means

Answer 2

In a zero-order reaction the rate of the reaction doesn’t depend on the concentration

Question 3

What is a half-life of a chemical compound?

Answer 3

Half-life is the time required for the concentration to decay to half its original value

Question 4

What is true about logistic growth?

Answer 4

The logistic growth model does not assume infinite recourses

Question 5

Which natural process is responsible for the uptake of CO2 and conversion into organic matter?

Answer 5

Photosynthesis

Question 6

Which natural process is responsible for the decomposition of organic compounds to CO2 and H2O?

Answer 6

Aerobic degradation

Question 7

What is produced during anaerobic degradation?

Answer 7

methane

Question 8

How is N2 converted to biological available forms in the environment?

Answer 8

by bacteria

Question 9

Which contaminant contributes to acid rain formation?

Answer 9

sulfur dioxide and nitrogen oxide

Question 10

Which factors mostly affect eutrophication to the greatest extent

Answer 10

concentration of nutrients and availability of sunlight

Question 11

List examples of waterborne bacteria that can cause human infections

Answer 11

Salmonella, Helicobacter

Question 12

List examples of inorganic pollutants that may be found in water

Answer 12

Heavy Metals

Question 13

Which is an example of a chlorinated toxic chemical

Answer 13

DDT

Question 14

Name two nutrients that are considered pollutants when they are in excess.

Answer 14

Nitrogen, Phosphorus

Question 15

What is true about PAHs

Answer 15

they are formed during incomplete combustion

Question 16

What is measured by BOD?

Answer 16

The amount of oxygen required by bacteria to break down organic substances

Question 17

What does COD stand for?

Answer 17

Chemical Oxygen Demand

Question 18

What does the ratio of BOD to COD indicate?

Answer 18

The biodegradability of the waste

Question 19

When determining the dissolved oxygen DO sag curve in a river, the rate of increase of DO deficit is expressed a
function of which two rates?

Answer 19

rate of de-oxygenation, rate of re-aeration

Question 20

What is the critical point in the DO sag curve

Answer 20

The point where DO is minimum