C12 Flashcards
What doe we rely on to make use new products and provide us with energy
The earths natural resources
What will run out eventually if we continue to exploit them
Fossil fuels and natural resources
Wht can be replaced as we use them up
Renewable resources like crop which are use to make biofuels
How is water made fit to drink?
By passing through filter beds to remove solids and adding chlorine to reduce microorganisms
How can water be purified
By distilation
Why may distilation be bad
It needs alot of energy which costs alot of money
How does reverse osmosis make water drinkable
Uses membranes to seperate dissolved salts from salty water
What does sewage treatment involve?
The removal of organic matter and harmful microorganisms
How id the sewage sludge seperated
B anaerobic digestion and is then dried
What can sewage sludge provide us with
Fertiliser and a source of renewable energy
How is most copper extracted
Smelting(roasting)
How els can coppeer be extracted from solutions of copper compounds
By electrolysis or by displacment using scrap iron
