Using Resources Flashcards
What is phytomining?
A method to absorb copper using plants.
How does phytomining work?
As the plants grow they absorb and store copper. The plants are then burned and the ash produced contains copper in relatively high quantities.
What is bioleaching?
A method to extract metals from low-grade ores using bacteria.
How does bioleaching work?
A solution containing bacteria is mixed with a low-grade ore and the bacteria convert the copper into a solution from which copper can be easily extracted.
What does potable water mean?
Water than is good quality and safe to drink.
What is sustainable development?
Development that meets the needs of the current generations and leaves resources for future generations.
Give examples of renewable resources.
Timber, wind/air, solar rays.
Give examples of non-renewable resources.
Fossil fuels, metal ores.
What causes the corrosion of metal?
When it reacts with oxygen and water.
What is meant by the term rusting?
The corrosion of iron objects or objects containing iron.
What is the word equation for rust?
iron+water+oxygen (goes to) hydrated iron oxide
What is a composite material?
A material that consists of two materials with different properties.
What is a life cycle assessment used to assess?
The environmental impacts a product has over its whole lifetime.
What is the Haber process?
A continuous process used to manufacture ammonia.
What is ammonia used for?
To produce nitrogen-based fertilisers.
What materials are used for manufacturing ammonia?
Purified nitrogen (from air), and hydrogen (from steam).
What are the required conditions for manufacturing ammonia?
moderate temperatures of 450°C and high pressure of 200 atmosphere and an iron catalyst.
Is the reaction between nitrogen and hydrogen exothermic or endothermic?
Exothermic.
What does NPK stand for in NPK fertilisers?
nitrogen (N), phosphorus (P), and potassium (K).
What are fertilisers used for?
To replace the essential elements in soil that are used up by plants as they grow.
In the Haber process, how is ammonia removed from the mixture?
When cooling, ammonia liquifies and is removed from the mixture.
