extracting metals

Alternative methods to extract metals can use

• lower grade ores

• higher grade ores

• electrolysis

• reduction

Alternative methods to extract metals use

• reduction

• electrolysis

• living organisms

The method for extraction where bacteria break down low-grade ores to produce an acidic solution containing copper ions

• Electrolysis

• Reduction

• Phytomining

• Bioleaching

Which shows the steps of Phytomining in the correct order?

• plants grown on ore, harvested and burnt, absorb ions, ash contains metal compounds

• plants grown on ore, absorb ions, harvested and burnt, ash contains metal compounds

• plants absorb ions, harvested and burnt, grown on ore, ash contains metal compounds

• plants absorb ions, harvested and burnt, ash contains metal compounds, grown on ore

A problem with mining is that it

• Conserves limited supplies of high-grade ores

• Reduces the amount of rock waste that needs to be disposed of

• Only uses low-grade ores

• Damages habitats, creates noise, dust and traffic

The solution produced from bioleaching is called the

• leachate

• effluent

• solvent

• sludge

An advantage of bioleaching is that it

• does not need high temperatures

• produces toxic substances

• produces sulfuric acid which can damage the environment

• creates noise, dust and traffic

To extract copper from the metal compounds obtained from bioleaching you could

• Displace it with iron

• Add sulfuric acid

• Mine it

Why is iron used to produce copper from the leachate?

• Copper is cheaper than iron

• Iron is cheaper than copper

• Copper is more reactive than iron

• Iron is less reactive than copper

Which of these do bioleaching and phytomining have in common?

• Done by bacteria
• Done by plants
• Involves burning
• Slow process
• Done on contaminated land