sc13

Question 1

what are the typical properties of transition metals?

Answer 1

• high melting point
• high density
• forms coloured compounds
• catalytic activity

Question 2

what does the oxidation of metals result in?

Answer 2

corrosion

Question 3

how can oxygen and water be excluded to prevent rusting?

Answer 3

• painting
• coating with plastic
• using oil

Question 4

how can sacrificial protection be used?

Answer 4

a more reactive metal is used which will rust first and prevent water and oxygen reacting with layer underneath

Question 5

why are alloys stronger than a pure metal?

Answer 5

• ions of different metals and sizes
• prevents ions from sliding easily leaving a stronger metal
• less malleable

Question 6

what is the properties and uses of magnalium?

Answer 6

properties :
- low density
- stronger than aluminium

use:
- aircraft parts

Question 7

what is the use and properties of brass (copper + zinc)?

Answer 7

properties :
- better conductor than zinc
- resistant to corrosion

use :
- electrical plug pins

Question 8

what are the properties and uses of gold?

Answer 8

properties :
- resistant to corrosion
- malleable
- doesn’t react easily

use :
- jewellery

Question 9

what are the properties and uses of copper?

Answer 9

properties :
- malleable
- good conductor of electricity

use :
- electrical cables

Question 10

what are the properties and uses of aluminium?

Answer 10

properties :
- malleable
- good conductor

uses:
- cooking foil

Question 11

what is electroplating?

Answer 11

• when corrosion resistant metal coating added
• more reactive metal corrodes when exposed instead of other metal
• pure metal object stays shiny