12 Questions
What is the definition of a pollutant?
A substance in the environment that produces a condition that is harmful to living things
What is the term for the increase in concentration of a substance as it moves up the food chain/web?
Biological magnification
What is the unit of measurement for LD50?
No unit, it's a ratio
What is the concentration of a substance in parts per million (ppm) equivalent to?
1 part substance in 1 000 000 parts of H2O
What is the purpose of LD50?
To compare the effects of different toxins
How would you calculate the concentration in ppm if you add 0.1 mL of DDT to 2000 mL of water?
Divide 0.1 by 2000 and multiply by 1 000 000
What is the equivalent ratio set up for parts per million?
1 mL out of 1 million mL
What is the disadvantage of the dump method of waste disposal?
Substances can leach into surrounding soil and groundwater
What is the purpose of a septic tank?
To break down organic materials using bacteria
What is leaching in the context of waste disposal?
The removal of materials by dissolving them away from solids
What is an advantage of the landfill method of waste disposal?
It prevents leaching
What is the purpose of a sewage treatment plant?
To treat wastewater with several steps including filtration and chemical treatment
Learn about the effects of pollution and toxins on the environment and human health. Understand how chemicals can be introduced into the environment through various human activities.
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