Science, asked by raginivishw04, 5 months ago

Give two examples of displacement
reaction.

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can anyone?.....bcoz this ans is too big

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Answered by Aayanjalees
2

Answer:

zinc displacing iron ions from iron(II) sulfate solution.

nickel displacing copper from copper(II) nitrate solution.

Answered by PayalSil20
2

Answer:

more reactive metal will displace a less reactive metal from a compound. The thermite reaction is a good example of this. It is used to produce white hot molten (liquid) iron in remote locations for welding. A lot of heat is needed to start the reaction, but then it releases an incredible amount of heat, enough to melt the iron.

aluminium + iron(III) oxide → iron + aluminium oxide

2Al + Fe2O3 → 2Fe + Al2O3

Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. The aluminium removes oxygen from the iron(III) oxide:

iron is reduced

aluminium is oxidised

Reactions between metals and metal oxides allow us to put a selection of metals into a reactivity series. Using metals A, B and C:

A oxide

XDisplaces ADisplaces A

B oxide

No reactionXNo reaction

C oxide

No reactionDisplaces CX

Metal A cannot displace either B or C - so it must be the least reactive and be at the bottom of this reactivity series.

Metal B displaces both A and C - so it must be the most reactive and be at the top of this reactivity series.

Metal C displaces A but cannot displace B - so it must be more reactive than A but less reactive than B, and be in between them in this reactivity series.

In general, the greater the difference in reactivity between two metals in a displacement reaction, the greater the amount of energy released.

Aluminium is much higher than iron in the reactivity series, so the thermite reaction releases a lot of energy. Magnesium is very high in the reactivity series, and copper is very low - so the reaction between magnesium and copper oxide is more violent.

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