Unit 3 topic 4

Question 1

what are materials that are pollutants

Answer 1

garbage, plastic, pesticides, fertilizers and hydro carbons.

Question 2

what is the term Mrs. Chen stand for

Answer 2

Mechanical 
Radiant 
Sound 
. 
Chemical 
Heat 
Electrical 
Nuclear

Question 3

What are 3 forms of energy that can be pollutants?

Answer 3

Nuclear, Heat and chemical

Question 4

what are the three alterations of the environment that are pollutants?

Answer 4

human development farming, and garbage dumps

Question 5

can living thing be pollutants?

Answer 5

farm Animals and introduced species yes because they will alter a environment

Question 6

how can you determine somethings toxicity

Answer 6

the amount (dose) of a chemical determines its toxicity

Question 7

How do we determine how much a chemical is in our water, air, soil or food?

Answer 7

we use parts per million (ppm)

Question 8

what does Ppm tell us?

Answer 8

tells us the #mg of toxin per 1kg of material or #mL per 1 000 000 mL of water
so 10 Ppm means 10 mg/kg or 1mL/1 000 000 mL of water

Question 9

what is toxicity

Answer 9

the ability of a chemical to cause harm to an organism.

Question 10

what is acute toxicity

Answer 10

when serious symptoms occur after only one exposure to the chemical.

Question 11

what is chronic toxicity

Answer 11

when symptoms occur only after a chemical accumulates to a specific level after many exposures over time.

Question 12

what is lethal dose 50

Answer 12

the dose of a chemical that will kill 50% of the population to which it is applied.