Heavy Metal Contamination
Chemistry ⇒ Environmental Chemistry
Heavy Metal Contamination starts at 10 and continues till grade 12.
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See sample questions for grade 10
A factory discharges wastewater containing 0.5 mg/L of cadmium into a river. If the safe limit is 0.01 mg/L, by what factor does the factory exceed the safe limit?
Describe one environmental impact of heavy metal contamination in rivers.
Describe one health effect of arsenic contamination in drinking water.
Describe one way governments can help prevent heavy metal contamination.
Explain how heavy metals can enter the food chain.
Explain the difference between bioaccumulation and biomagnification.
Explain the term 'biomagnification' in the context of heavy metal contamination.
Explain why fish at the top of the food chain often have higher concentrations of mercury than those at the bottom.
Explain why heavy metals are considered persistent pollutants.
List two ways heavy metals can enter the human body.
List two ways to reduce exposure to heavy metals in daily life.
Name two common sources of heavy metal contamination in the environment.
State one reason why children are more vulnerable to heavy metal poisoning than adults.
A river downstream from a mining site is tested for zinc and found to have a concentration of 3.5 mg/L. If the safe drinking water limit for zinc is 2.0 mg/L, calculate the percentage by which the river water exceeds the safe limit.
A soil sample from a playground is found to contain 120 mg/kg of lead. The international safety guideline for lead in soil is 50 mg/kg. By how many mg/kg does the sample exceed the safety guideline?
Describe how the improper disposal of electronic waste can contribute to heavy metal contamination in the environment.
Explain the role of chelating agents in the treatment of heavy metal poisoning.
Explain why heavy metals such as mercury and cadmium are more dangerous when present in their ionic forms in water compared to their elemental forms.
