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 12
Describe how heavy metals can affect aquatic ecosystems.
Describe one way in which heavy metals can enter the human body through the food chain.
Describe the role of pH in the mobility of heavy metals in soil.
Describe two major sources of mercury contamination in the environment.
Explain the difference between bioaccumulation and biomagnification in the context of heavy metal contamination.
A soil sample contains 0.5 mg/kg of lead. If the safe limit is 0.1 mg/kg, by what factor does the sample exceed the safe limit?
A groundwater sample contains 0.08 mg/L of cadmium. If the World Health Organization's guideline value for cadmium in drinking water is 0.003 mg/L, by what factor does the sample exceed the guideline?
A river near an industrial area shows elevated levels of both lead and cadmium. Discuss the possible chemical interactions between these two heavy metals in the aquatic environment and how these interactions might affect their toxicity and mobility.
Which of the following health effects is most commonly associated with lead exposure?
(1) Kidney failure
(2) Neurological damage
(3) Skin cancer
(4) Asthma
Which of the following heavy metals is commonly used in the production of paints and can cause poisoning if ingested?
(1) Lead
(2) Zinc
(3) Iron
(4) Nickel
Which of the following heavy metals is essential in trace amounts for human health but toxic at higher concentrations?
(1) Lead
(2) Chromium
(3) Mercury
(4) Arsenic
Which of the following heavy metals is most likely to be found in contaminated rice due to irrigation with polluted water?
(1) Lead
(2) Cadmium
(3) Mercury
(4) Chromium
Fill in the blank: The chemical symbol for cadmium is __________.
Fill in the blank: The maximum contaminant level (MCL) for lead in drinking water, as recommended by the World Health Organization, is __________ micrograms per liter.
Fill in the blank: The process by which heavy metals increase in concentration as they move up the food chain is called __________.
Fill in the blank: The process of using plants to remove heavy metals from contaminated soil is called __________.
True or False: All heavy metals are toxic to humans at any concentration.
True or False: Arsenic contamination in groundwater is a major problem in some regions of the world.
True or False: Chromium(VI) is more toxic than Chromium(III).
True or False: Heavy metals can be completely destroyed by incineration.
