Ways of Reducing Use of Resources Flashcards
What is the life-cycle assessment?
The ‘__________________’ analysis of the ________________________________ on the environment.
cradle to grave
impact of a manufactured product
The stages of the life-cycle assessment:
1.Extracting and processing the _______________ needed.
- __________________ the product and its packaging.
- Use of the product during its _____________.
- _______________ of the product at the end of its useful life.
raw materials
Manufacturing
lifetime
Disposal
What are 5 advantages of recycling:
- Fewer quarries needed to _____________________.
- Less ___________ needed to be extract to make plastic.
- Less __________ needed to make new products.
- Less emissions of ______________________.
- Less waste disposed in ______________.
extract finite metals
crude oil
energy
greenhouse gases
landfills
What is 1 disadvantage of recycling metals?
It can be difficult to sort different metals from one another.
What is phytoextraction?
The use of plants to absorb metal compounds from the ground through their roots.
After metal compounds are absorbed through the roots during phytoextraction, what is the next stage?
The plants are then burned to produce an ash containing a high concentration of the metal compounds.
The steps of phytoextraction:
Plants are grown on a _______________.
The plants absorb metal ions through their roots and ________________________________.
The plants are _______________________.
The ______ left behind contains ___________________.
low-grade ore
concentrate the ions in their cells
harvested and burnt
ash
metal compounds
What is one disadvantage of phytoextraction?
It is slow.
What is bioleaching?
The use of bacteria to extract metals from their ores.
What does bioleaching produce?
An acidic solution containing copper ions.
What is the solution used in bioleaching called?
Leachate.
What is the solution used in bioleaching called?
Leachate.
What is 1 disadvantage of bioleaching?
Produces toxic substances such as sulfuric acid, which damage the environment.
Iron is used to displace copper from the leachate because iron is more reactive than copper.
Alternatively, in bioleaching the copper compounds can be _______________ and the solution (leachate) ________________ to produce copper metal.
dissolved
electrolysed
