phytomining and bioleaching and polymers and other materials.

Question 1

describe the process of phytomining.

Answer 1

grow plants in soil containing copper compounds- plant absorbs copper compound
plants are burnt
the ashes contain extracted copper
leaching or bioleaching- making solution of metal using bacteria
solution containing copper compounds in solution- displacement with scrap iron/ electrolysis
copper metal

Question 2

what is this process with low grades ores?

Answer 2

leaching or bioleaching
solution containing copper compounds
displacement with scrap iron/ electrolysis
copper metal

Question 3

Properties of borosilicate glass?

Answer 3

melts at higher temp
greater resistance to heat

Question 4

property of clay ceramics.

Answer 4

hard, unreactive, resistant to heat

Question 5

what are composites?

Answer 5

made from 2 or more materials has reinforcement and (fibres/ fragments)

Question 6

carbon fibre composites what is matrix, reinforcement, uses?

Answer 6

polymer
fibres/ nanotubes
tennis rackets

Question 7

what is a thermosoftening plastic?

Answer 7

melts/ soften on heating

Question 8

what is the structure of thermosoftening plastic?

Answer 8

layers move over each other
weak forces between chains
no bonds

Question 9

what are themosetting plastics?

Answer 9

don’t melt/ soften on heating

Question 10

what is the structure if thermosetting plastic?

Answer 10

covalent bonds between chains
cross links between chains

Question 11

what are the factors that affect the polymer formed?

Answer 11

different monomer
density