sc11 reactivity of metals

Question 1

if something is oxidised what happens to it

Answer 1

it gains oxygen and loses electrons

Question 2

if a metal is more reactive does it mean it is more or less resistant to oxidation

Answer 2

less resistant

Question 3

which metals are extracted using electrolysis

Answer 3

potassium, sodium, calcium, magnesium and aluminium because they are more reactive

Question 4

which metals are extracted by reduction using carbon

Answer 4

zinc iron, tin, copper and silver because carbon can only take the oxygen away from metals which are less reactive than carbon itself

Question 4

which metals are found uncombined in the earths crust

Answer 4

silver and gold

Question 5

what is bioleaching

Answer 5

using bacteria to separate the metals from the ores, the bacteria get energy from the bonds between the atoms in the ore, separating out the metal from the ore in the process, the solution produced can have metal ions extracted by electrolysis or displacement

Question 6

what is phytoextraction

Answer 6

growing plants in soil that contain metal compounds, the metal then builds up in the leaves which can then be burned to ash that can have the metal ions extracted by electrolysis or displacement

Question 7

what are the four stages of the life cycle assesment

Answer 7

choice of mineral- different minerals cause different amounts of pollution to be mined and extracted
manufacture- causes lots of pollution from waste material
product use- can damage the environment e.g paint gives off toxic fumes
disposal- landfill