concept 2

Question 1

what is an acid?

Answer 1

a compound that dissolves in water to form a pH lower than 7

Question 2

what is acute toxicity?

Answer 2

reaction to a harmful substance after a single exposure

Question 3

what is chronic toxicity?

Answer 3

reaction after many repeated exposures

Question 4

what is a base?

Answer 4

a compound that dissolves in water to form a pH higher than 7

Question 5

what are heavy metals?

Answer 5

metals that have a density of five or higher. are one type of substance monitored to determine water quality

Question 6

what is an indicator?

Answer 6

living things in the environment

Question 7

what are invertebrates?

Answer 7

animals without any backbones

Question 8

what is LD50?

Answer 8

the amount of a substance that can kill 50% of a group of organisms (mainly test animals receiving the same amount of that substance at the same time)

Question 9

what is monitoring?

Answer 9

keeping track of something for a specific purpose

Question 10

what does “neutral” mean?

Answer 10

a substance that is neither an acid or a base

Question 11

what is neutralization?

Answer 11

a reaction between an acid and a base that produces water and a solid compound called salt

Question 12

what is “pH”?

Answer 12

power of hydrogen. the number of hydrogen ions in a solution

Question 13

what does “parts per million” mean?

Answer 13

measuring how something has one part of solute for a million parts of a solution

Question 14

what does “toxic” mean?

Answer 14

something is poisonous or polluted

Question 15

what is toxicity?

Answer 15

how poisonous a substance is

Question 16

what provincial and federal governments classify water quality as? (5)

Answer 16

human drinking water, livestock drinking water, recreation, irrigation, protection of aquatic life

Question 17

what was DDT?

Answer 17

an insecticide that was used to kill off harmful organisms, especially mosquitos

Question 18

why is dissolved oxygen important?

Answer 18

it’s essential for the health of the aquatic life

Question 19

what does the level of dissolved oxygen in an environment depend on? (4)

Answer 19

temperature, turbulence, the amount of photosynthesis, the number of organisms using up the oxygen

Question 20

what is “spring acid shock”?

Answer 20

when acid builds up in snow and ice in the winter, then, in the spring, the snow and ice will melt into aquatic systems

Question 21

what happens when phosphorus and nitrogen content get into aquatic systems?

Answer 21

they die and become food for bacteria > bacteria numbers increase > use of dissolved oxygen > when the dissolved oxygen content decreases, many fish/aquatic insects cannot survive

Question 22

what happens when a blue litmus is placed into a substance?

Answer 22

it will turn red if the substance is acidic, and it will stay blue if the substance is basic

Question 23

what happens when a red litmus is placed into a substance?

Answer 23

it will stay red if the substance is acidic, and it will turn blue if the substance is basic