give one example of each of displacement, decomposition and combination reaction with explanations
Answers
in this copper sulphate is added to iron and ironing displaces copper because it is more reactive.
2.I am not very clear about decomposition.
3. combination reaction: Na+Cl>sodium chloride.
In combination reaction, two simple substance are combined to form compound.
1. Combination Reaction :
A chemical reaction in which two or more substances combine to form a single product is called a combination reaction or synthesis.
When iron and sulphur are heated together, they combine to form a single product, iron sulphide.
2Fe(s) + S(s) → FeS (s)
Iron Sulphur Iron sulphide
2. Decomposition Reaction :
A chemical reaction in which a single compound splits into two or more simple substances is called a decomposition reaction.
When mercuric oxide is heated in a crucible, the orange-red powder begins to darken and a silver mirror begins to deposit on the cooler parts of the crucible. This is mercury. If we hold a glowing splint near the crucible, it can relight. This shows that the gas evolved during the reaction is oxygen.
2HgO(s) 2Hg(s) + O2 ↑
Mercuric oxide Mercury Oxygen
3.Displacement Reaction:
Reactions in which the more reactive element displaces the less reactive element from its compound are called displacement reactions.
Zinc displaces copper in copper sulphate to form zinc sulphate.
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
Zinc Copper sulphate Zinc sulphate