Chemistry of Pesticides and Fertilizers in the Environment
Chemistry ⇒ Environmental Chemistry
Chemistry of Pesticides and Fertilizers in the Environment starts at 11 and continues till grade 12.
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See sample questions for grade 12
A farmer applies 200 kg of a fertilizer containing 20% phosphorus pentoxide (P2O5). Calculate the mass of P2O5 applied.
Calculate the mass of nitrogen supplied by 100 kg of ammonium nitrate fertilizer (NH4NO3). (Atomic masses: N=14, H=1, O=16)
Describe how the use of pesticides can affect pollinator populations.
Describe how the use of pesticides can lead to the development of resistant pest populations.
Describe how the use of slow-release fertilizers can benefit the environment.
Describe the environmental impact of using excessive phosphate fertilizers.
Describe the role of chelating agents in micronutrient fertilizers.
Describe two ways in which fertilizers can contaminate groundwater.
Explain the difference between persistent and non-persistent pesticides.
Explain the environmental consequences of using chlorinated hydrocarbon pesticides.
Explain the term 'bioaccumulation' in the context of pesticides.
Explain the term 'integrated pest management' (IPM).
Explain why nitrate contamination in drinking water is a health concern.
Explain why the overuse of fertilizers can lead to soil salinization.
Name the process by which excess nutrients from fertilizers lead to the overgrowth of algae in water bodies.
