Resources Flashcards
(23 cards)
What process is needed to make sea water potable and what does it entail?
Desalination which involves reverse osmosis or distillation
Describe the steps of waste water treatment
- Screening and grit removal
- Sedimentation to produce sludge and effluent
- Sludge has anaerobic bacteria treatment and effluent has aerobic bacteria treatment
What are the stages of a life cycle of a product
Raw materials, manufacture, use, disposal
Really magical useful dogs
What is galvanising
Coating a metal with zinc
What is bronze an alloy of
Copper and tin
What is brass an alloy of
Copper and zinc
What is gold usually alloyed with
Copper and zinc
What are the properties of high carbon steel
Hard and brittle, used to make cutting tools
What does stainless steel contain
Iron, carbon, chromium, nickel
I Can’t Completely kNow
What are the properties of aluminium alloys
Low density - often used in aircraft
What is soda lime glass made out of
Sand, sodium carbonate and limestone
Why are the uses of soda lime glass limited
It has a relatively low melting point
What is borosilicate glass made out of
Boron trioxide and sand
Give the equation for the haber process
N2 + 3H2 <-> 2NH3
What catalyst is needed for the haber process
Iron
How to obtain materials for the haber process
Nitrogen is extracted from the air
Hydrogen is produced by reacting methane and steam
What does phosphoric rock and nitric acid produce
Phosphoric acid and calcium nitrate
What has to happen to phosphoric acid before it’s added to plants
Neutralised with ammonia to produce ammonium phosphate
What does phosphoric rock and Sulfuric acid make
Calcium phosphate and calcium sulfate aka single superphosphate
What is triple superphosphate
Phosphate rock with phosphoric acid
What is the difference between reacting ammonia and nitric acid in school vs industry
Dilute solutions are used which are more safe in schools, only a small amount of product is produced. In industry the ammonia is a gas and the nitric acid is concentrated
Describe the steps of waste water treatment
Screening, sedimentation to produce effluent and sludge. Sludge is digested by anaerobic bacteria. Air is bubbled through the effluent to allow aerobic bacteria to multiply and digest harmful organic material
How are the products from anaerobic sludge treatment used
Biogas produced can be burned for fuel and the leftover sludge is used for fertiliser
