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reactivity of metals - Coggle Diagram
reactivity of metals
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reactions with steam
zn
powedred form glows to form a yellow solid, which changes to white on cooling
heat is released
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fe
powdered form glows at red heat, forming a black solid
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al
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no reaction in foil form, unless the protective layer of aluminium oxide is removed
powdered form burns to form a white solid
heat is released
mg
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the heated ribbon burns with a bright, white light
forms a white solid
heat is released
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aluminium
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aluminium is reasonably reactive, but the protective aluminium oxide layer means that it can be used for sauce pans without reacting with food
a piece of aluminium foil does not react with air, water or stream because of the protective oxide layer
solids
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the reactions are carried out with both the metal oxide and the metal in powder form to increase the contact between solids
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if a mixture of magnesium powder and copper oxide is heated strongly in a crucible, the crucible explodes. powdered metals can be highly flammable
reaction with water
na
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floats on the surface
moves about the surface
melts and forms a silvery ball
fizzes, giving off a gas
heat is released
eventually disappears
forms a colourless solution
ca
fizzes, giving off a gas
sinks, then rises
heat is released
eventually disappears
forms a colourless/milky solution
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k
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floats on the surface
moves around the surface
burns with a lilac flame
fizzes, giving off a gas
heat is released
small explosions/crackles
eventually disappears
forms a colourless a solution
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solutions
the release of heat because displacement reactions are exothermic- the bigger the difference in the reactivity of the metals, the more heat will be released
appearance of the solid metal that is being displaced from - remember to state its colour and the fact that a solid is produced
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any colour changes in the solution- copper 2 sulfate solution is frequently used because it gives a definite colour change
displacement reactions
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a displacement reaction is a reaction in which a more reactive metal takes the place of a less reactive metal in a compound
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