Question

Identify type of reaction:

$\mathrm{Cu}\left(\mathrm{s}\right)+\mathrm{S}\left(\mathrm{s}\right)\stackrel{\mathrm{heat}}{\to }\mathrm{CuS}\left(\mathrm{s}\right)$

Answer 1

1. Type of reaction

Combination reaction: Reaction in which two or more reactants combine to form a single product. $\mathrm{A}+\mathrm{B}\to \mathrm{C}$

Decomposition reaction: Reaction in which reactant is broken down into two or more products in the presence of heat, light or electricity. $\mathrm{A}\to \mathrm{B}+\mathrm{C}$

Displacement reaction: Reaction in which one of the higher reactive element displaces a less reactive element from its solution. $\mathrm{A}+\mathrm{BC}\to \mathrm{AC}+\mathrm{B}$ ( Here A is more reactive than B)

Double displacement reaction: Reaction in which ions of both the reactants interchange their place and form new compounds. $\mathrm{AB}+\mathrm{CD}\to \mathrm{AD}+\mathrm{CB}$

2. Reaction:

$\mathrm{Cu}\left(\mathrm{s}\right)+\mathrm{S}\left(\mathrm{s}\right)\stackrel{\mathrm{heat}}{\to }\mathrm{CuS}\left(\mathrm{s}\right)$

Copper Sulphur Copper sulphide

Here copper and sulphur are combined and form copper sulphide.

That means it is a combination reaction because two reactants are combining and forming a single product.