Question

give one example each of displacement, decomposition, and combination reaction with short explanation​

Answer 1

Answer:

called a combination reaction or a synthesis reaction) produces a single substance from multiple reactants. A single substance as a product is the key characteristic of the composition reaction. There may be a coefficient other than one for the substance, but if the reaction has only a single substance as a product, it can be called a composition reaction. In the reaction

2 H2(g) + O2(g) → 2 H2O(ℓ)

water is produced from hydrogen and oxygen. Although there are two molecules of water being produced, there is only one substance—water—as a product. So this is a composition reaction.

A decomposition reaction starts from a single substance and produces more than one substance; that is, it decomposes. One substance as a reactant and more than one substance as the products is the key characteristic of a decomposition reaction. For example, in the decomposition of sodium hydrogen carbonate (also known as sodium bicarbonate),

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(ℓ)

sodium carbonate, carbon dioxide, and water are produced from the single substance sodium hydrogen carbonate.

Composition and decomposition reactions are difficult to predict; however, they should be easy to recognize.

Answer 2

Answer:

displacement reactions are those in which a more reactive element displaces a less reactive element from its salt solution.

Fe+CuSO4= FeSO4+cu

decomposition reactions are those in which a substance breaks down to form two substances

2h2O= h2 + O2

combination reactions are those in which two substances are combined to form one substance.

h2+O2=2H2O

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