Making Resources A Flashcards
What is corrosion?
The destruction of a material through reactions with environmental substances
What physical barriers can protect against corrosion?
Grease, paint, a thin layer of metal
What is sacrificial protection?
Adding a more reactive metal to the surface of a material
How is rust formed?
Reaction between iron, water and oxygen
What are two allows of copper?
Brass, bronze
What are gold alloys (in jewellery) made from?
Gold with copper, zinc and silver
What are steel alloys made from?
Iron, carbon and other metals
What is a property of aluminium alloys?
Generally have low density
What is the difference between soda-lime and borosilicate glass?
Borosilicate glass has a much higher melting point
Give two example of clay ceramics.
Pottery, bricks
What two things do the properties of polymers depend on?
Monomers, conditions under which they are formed
What is the difference between thermosetting and thermosoftening polymers?
Thermosetting: do not soften when heated
Thermosoftening: soften when heated
What is a composite?
A mixture of a matrix and reinforcements
Name two composites.
Plywood and reinforced concrete
What is the balanced symbol equation for the Haber process?
N₂ (g) + 2H₂ (g) ⇌ 2NH₃
What is ammonia used for?
Fertilisers
Haber process: what happens if you increase the temperature? (effect on yield, rate, cost)
Rate, cost increase
Yield decreases
Haber process: what happens if you increase the pressure? (effect on yield, rate, cost)
Yield, cost, rate all increase
What catalyst is used in the Haber process?
Iron
What is the temperature used in the Haber process?
450°C
What is the pressure used in the Haber process?
200 atm
What is the catalyst used in the Haber process?
Iron
What is an NPK fertiliser?
A formulation
Contains: soluble compounds of nitrogen, phosphorus, potassium
