using resources Flashcards
(17 cards)
explain photomyning
grow plants near metal ore
harvest and burn the plants
ash contains the metal compound
process ash by electrolysis or displacement with scrap metal
explain bioleaching
grow bacteria near the metal ore
bacteria produce leachate solutions that contain metal compound
process leachate by electrolysis or displacement with scrap metal
what is corrosion
when a material reacts with substances in the environment and eventually wears away.
where does plastic usually come from
fossil fuels - non renewable
what are some ways corrosion can be prevented
physical barriers - grease, paint, electroplating or sacrificial protection - a more reactive substance
what is bronze a composition of, its properties and uses
copper and tin. resistant to corrosion. statues, decorative items, ship propellers
what is brass and properties and uses
copper and zinc.
hard but workable
door fittings, taps, musical instruments
what is gold alloys and properties and uses
gold, copper silver and zinc added. attractive, corrosion resistant.
jewelerry
high carbon steel - uses etc
iron with 1-2% carbon - strong but brittle - cutting tools, metal presses
low carbon steel
iron with less than 1% carbon - soft and easy to shape - machinery, ships, containers
stainless steel
iron with chromium and nickel
resistant to corrosion and hard
cultery, plumbing
aluminium alloys
over 300 alloys avaialble - low density aircraft, military uses
soda lime glass
heat a mixture of sand, sodium carbonate, lime stone - transparent, brittle
borosilicate glass
heat sand and boron trioxide - higher melting point than the otherglass - oven glassware, lab glassware
clay ceramics
shape wet clay then shape on furnace - hard, brittle, easy to shape, crockery, constructions
what are composites
fragments of one material are surrounded by a matrix material that holds the fragments together
what is an NPK ferteliser
a formulation containing soluble compounds of nitrogen, phosphorus and potassium
