Metals

Question 1

What is corrosion?

Answer 1

when oxygen and water react with metal and gives us another way of describing oxidation and reduction

Question 2

What is special about this equation?:

Ca(s) + Cl2(g) —-> CaCl2(s)

Answer 2

• The chlorine has been reduced by the calcium, therefore the calcium is a reducing agent
• The calcium has been oxidised by the chlorine, therefore the chlorine is the oxidising agent.
• a reaction that uses both reduction and oxidation is called a radox reaction

Question 3

what is a radox reaction?

Answer 3

a reaction that uses both reduction and oxidation

Question 4

where are metals found?

Answer 4

in rocks

Question 5

what is an alloy?

Answer 5

There are when different metals are bonded together - this stops them from being able to slide

Question 6

name some characteristics for copper

Answer 6

• electrical wires
• malleable
• conducts electricity
• ductile

Question 7

name some characteristics for aluminium

Answer 7

• aeroplanes
• low density
• malleable

Question 8

name some characteristics for iron (steel)

Answer 8

• car panels
• strong
• malleable
• cheap

Question 9

what is the perfect condition for rusting?

Answer 9

water and oxygen

Question 10

paint is a ……. method

Answer 10

barrier - protective coating

Question 11

galvanising is a ……. method

Answer 11

reactivity - water will react with he zinc coating not the iron underneath

Question 12

sacrificial protection is a ……. method

Answer 12

reactivity - more reactive metal fixed to the one you want to protect.