Examples of single displacement reactions

Zn + CuCl₂  → ZnCl₂ + Cu

Br₂ + 2KI  →  2KBr + I₂

Explanation:

Single replacement:

It is the reaction in which one elements replace the other element in compound.

General reaction:

AB + C → AC + B

Example:

Zn + CuCl₂  → ZnCl₂ + Cu

Zinc is more reactive than copper. It displaces the copper from chloride and itself react with chlorine and form ZnCl₂.

Br₂ + 2KI  →  2KBr + I₂

Bromine is more reactive than iodine. It displaces the iodine from potassium and get react with potassium and form potassium bromide.

what is the question?

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.