Substitution reactions can require a catalyst to be feasible. The reaction represented by the
following equation is heated to maximize the percent yield.
CH.(8) + Cl2(g) + energy CH. CI(I) + HCI(8)

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

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.