5. Which product is least likely to happen in a decomposition reaction?
a. two or more elements and compounds
b. one

c. a single product
d. a single compound

a. two or more elements and compounds.

Explanation:

a decomposition reaction occurs when one reactant breaks down into two or more products. this can be represented by the general equation : ab - a + b. examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

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.