Chemistry- The behaviour of metals

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  • Created by: Kitsune
  • Created on: 15-08-16 13:38
What is meant by 'reactive'?
Strong drive to give up electrons and form ions
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What is the reactivity series?
Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, tin, lead, hydrogen, copper, silver, gold, platinum
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What does a metal more reactive than hydrogen do to it?
Displaces it
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What does carbon do to an oxide of a less reactive metal?
Reduce it. A metal will form
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What will a more reactive metal do to an oxide of the other?
Reduce it (exothermic reaction)
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What will a more reactive metal do to a solution of another one?
Displace it and form ions instead of it
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The more reactive the metal...
The more stable its compound
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Which metals are harder to extract from ores?
The more reactive ones
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What is thermal decomposition?
Breaking down a compound by heating it
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What compounds break easier when heated?
Compounds of less reactive metals
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What happens during thermal decomposition to carbonates, nitrates and hydroxides?
Carbonate = CO2 + oxide, nitrate = oxide + NO2 + oxygen, hydroxide = oxide + water
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Talk about the Thermite process.
Used to repair tram and rail lines. Powdered aluminium and iron oxide are placed in a container and lit. Iron is reduced. It runs into cracks and hardens.
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How to make a simple cell?
The difference in reactivity causes a redox reaction. Two different metals are placed in an electrolyte. Electrons flow from a more reactive metal, so it is called the negative pole. The further apart in reactivity the higher the voltage.
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Describe the sacrificial protection of iron.
Iron rusts to form an oxide. To prevent that from happening a more reactive metals such as zinc is placed. Zinc will be oxidised instead of iron.
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Describe galvanising
Another way zinc protects iron. This basically means coating with zinc by electrolysis, which keeps air and moisture away. Even if the coating is damaged sacrificial protection will occur. Used for car bodies and roofing
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Why doesn't aluminium corrode?
It protects itself by reacting with oxygen to form a coat of aluminium oxide which makes it unreactive
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Other cards in this set

Card 2

Front

What is the reactivity series?

Back

Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, tin, lead, hydrogen, copper, silver, gold, platinum

Card 3

Front

What does a metal more reactive than hydrogen do to it?

Back

Preview of the front of card 3

Card 4

Front

What does carbon do to an oxide of a less reactive metal?

Back

Preview of the front of card 4

Card 5

Front

What will a more reactive metal do to an oxide of the other?

Back

Preview of the front of card 5
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