Unit10- Using Resources Flashcards
What do humans rely on the earth🌏 for ?
🔥🏠🍔🚗
Warmth
Shelter
Food
Transport
Where do the Earths resources come from⛰🌊☁️
Earths crust
Ocean
Atmosphere
What does finite mean
Non renewable resources like metals
Sustainable developing meets the needs of the current generation without compromising who
The future generations
What must water be low in in order for in to be safe for humans
Salt and microorganisms
Which type of water is safe to drink
Potable water
How is potable water produced in the UK?
4 steps 🏞🚬💨😁
- Fresh water is collected from lake or river
- Passed through a filter bed to remove particles
- Chlorine gas is added to kill microorganisms
- Fluoride is added to reduce tooth decay
Ozone and ultraviolet can also be used to ?
Sterilise water
To improve the taste and quality👌🏼of tap water🚰, more dissolved substances can be removed❌by passing the water through a filter🚬containing ?
Carbon
Silver
Ion exchange resins
What can be done to sea water to create pure water
Desalinate it
How can desalination be done and what is a negative of it
Distillation or reverse osmosis
Uses loads of energy = Expensive
During distillation, the water is boiled to produce steam, the steam is then ?
Condensed to produce pure liquid water
What are the 2 tests that can be done to see if a colourless liquid is water
Cobalt chloride paper
Anhydrous copper sulphate
How do you test whether water is pure
Boil it and see if it boils at 100C
Pure water contains no?
Dissolved substances
What are 4 sewage treatments?
🎥🗻❌✅🏃🏼♀️
- Screening and grit removal 🎥
- Sedimentation to produce sewage sludge and effluent 🗻
- Anaerobic digestion of sewage sludge🏃🏼♀️❌
- Aerobic biological treatment of effluent✅
What are the 3 reasons copper is a useful metal🔥🔌🚰💧
- Good conductor of electricity and heat🔥🔌
- Malleable, yet hard enough to make water pipes and tanks🚰
- Does not react with water so last longer💧
What is smelting (terms of copper)
When copper is extracted from its ore by being heated in a furnace with carbon
After being smelted, copper can then be purified by what?
Electrolysis
What are 2 other methods to obtaining copper (excluding smelting)
- From solutions of copper salts by electrolysis
2. By displacement using scrap iron
During electrolysis of copper, the positive copper ions move towards the ? Electrode to form ?
Negative
Pure copper
Due to the extensive mining of copper in the past, there is now little copper-rich ores.
What 2 new methods have been introduced that extract from ores with less copper?🌱🐲
- Phytomining 🌱
2. Bioleaching 🐲
What is phytomining?🌱
- As the plants grow…
- The plants are then burned…
A method that uses plants to absorb copper
- 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 solution containing…
- The bacteria convert…
The use of bacteria to extract metals from low-grade ores:
- A solution containing bacteria🐲 is mixed with a low-grade ore.
- The bacteria convert the copper into a solution ( known as leachate solution), from which copper can be easily extracted.
