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Sustainability and recyling of materials — Free MYP5 Chemistry Practice Questions
1QuestionConcept of sustainability and resource managementConcept Practice
2 marks~3 minCriterion A
A recycling facility uses a conveyor belt to carry mixed waste past two separators: a magnetic separator and an eddy current separator. The magnetic separator contains a powerful electromagnet. The eddy current separator spins a rapidly rotating drum of alternating magnetic poles, inducing currents in nearby metals.
a
Identify which separator is used to remove ferrous metals such as iron and steel from the mixed waste. [1]
b
Explain why the eddy current separator cannot be used to separate ferrous metals in the same way it separates non-ferrous metals such as aluminium. [1]
Solutions
2QuestionEnvironmental impact of waste and landfillAssessment Practice
2 marks~3 minCriterion D
A local council treats landfill leachate containing dissolved and ions by adding lime (), which causes the heavy metals to precipitate as insoluble hydroxides such as and .
a
Identify one industry or sector, other than landfill management, where chemical precipitation with lime is used to remove heavy metal ions from wastewater. [1]
b
Explain one limitation of using lime precipitation as the sole treatment method for landfill leachate. [1]
Solutions
3QuestionTypes of recyclable materials (plastics, metals, glass)Concept Practice
4 marks~6 minCriterion A
Three common household items are shown: a plastic bottle made from PET (polyethylene terephthalate), an aluminium can, and a glass jar.
a
State the full chemical name of the material used to make the plastic bottle. [1]
b
For two of the three items, identify the material and state one property that makes each material recyclable. [2]
c
Explain why aluminium is considered more economically valuable to recycle than glass, despite both being infinitely recyclable. [1]
Solutions
4QuestionReduce, Reuse, Recycle (3Rs) strategiesAssessment Practice
5 marks~8 minCriterion C
The diagram shows simplified molecular structures of two polymers: polyethene and poly(lactic acid) (PLA).
Polyethene consists of long hydrocarbon chains with only and bonds. PLA contains repeating ester linkages () in its backbone, derived from lactic acid monomers.
Polyethene consists of long hydrocarbon chains with only and bonds. PLA contains repeating ester linkages () in its backbone, derived from lactic acid monomers.
a
Explain why polyethene is resistant to breakdown by microorganisms in landfill. [2]
b
Explain why PLA is broken down more readily than polyethene by microorganisms. [2]
c
A landfill operator claims that increasing temperature and moisture content will significantly accelerate PLA degradation, but will have negligible effect on polyethene degradation. Evaluate this claim. [1]
Solutions
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