Environmental Chemistry: Going Further

Concentration, pH and how a substance moves through a food chain.

9 questions, free, marked as you go with a worked explanation on every one.

What this covers

A lake contains 0.6 mg of a pollutant in every litre of water. Express that concentration in parts per million, given that 1 mg per litre is 1 ppm.
A pollutant measured at 0.5 ppm in lake water is found at 25 ppm in the fish that live there. What explains the difference?
A solution has a pH of 4. Another has a pH of 6. How do they compare?
Which of these are true of acid deposition in Alberta? Select all that apply.
A 250 mL sample of water contains 5 mg of nitrate. What is the concentration in milligrams per litre?
A factory discharges warm water into a river. Fish downstream begin to struggle. What is the most likely reason?
Which is the strongest reason to prefer a biodegradable pesticide over a persistent one?
A student adds a base to an acidic solution until the pH reads 7. What has happened?
Use the table. How many times more concentrated is the pollutant in the large fish than in the water?