Resources of material and energy Flashcards
How is efficiency calculated?
Useful output energy transfer / total input energy transfer
What method is used to extract metals from their ores?
It depends on reactivity.
What happens to the energy that is not usefully transferred in a system?
Dissipated
Which metals are extracted by electrolysis?
Above carbon in the reactivity series.
Which metals are extracted by reduction?
Below carbon in the reactivity series.
Which method uses bacteria to produce leachate solutions?
Bioloeaching
Which method uses plants to absorb metal compounds?
Phytomining
What are the stages in a life cycle assessment?
a) extracting and processing raw materials b) manufacturing and packaging c) use and operation during its lifetime d) disposal at the end of its useful life
Which substance is used to extract metals from their ores by reduction?
Carbon
Which type of heat transfer does double glazing reduce?
Conduction
Which type of heat transfer does loft insulation reduce?
Convection
In terms of oxygen, what is oxidation?
Addition of oxygen
In terms of oxygen, what is reduction?
Removal of oxygen
What is the purpose of a life cycle assessment?
Compares different products to see which cause least damage to the environment, over their whole lifetime.
