cc4 Flashcards
give the reactivity series most to least reactive
potassium, sodium, calcium, magnesium, aluminium, carbon zinc, iron, hydrogen, copper silver gold
where are the most metals extracted from ores found
the earth crust
where and how are unreactive metals found
in the earths crust as the uncombined elements
what happens to ores when metals are extracted from them.
they are reduced
give two methods of extracting metals from their ores
heating with carbon and electrolysis
which two factors affect which method is chosen to extract metal
The position of the metals on the reactivity series and the cost of the extraction process
name to biological methods of metal extraction
bacterial and phytoeextraction
do you have three advantages of recycling metals?
economic implications, preservation of both environments and the supply of valuable raw materials
what are the four stages that are considered when doing a lifetime assessment of the product
consideration of the fact of the environment of obtaining the raw materials manufacturing the product is in the product and disposing of the product when it’s no longer useful
how can the direction of some irreversible reactions be altered?
by changing the reaction of conditions
what are the conditions for the hanger process
temperature 450° pressure, 200 atmospheres iron catalyst
what is made in the haber process?
ammonia
what reacts to form anomia?
nitrogen and hydrogen
what is hydrogen obtained from?
natural gas
what is nitrogen extracted from?
the air
