Name a pair of elements that would likely combine to form a salt and write the formula.

Cl and Na combine to form NaCl.

Explanation:

In neutralization reactions, an acid and a base combine to produce a salt and water. The salt forms from an anion from the acid and the cation from the base. For example:

HCl (aq) + Na(OH) (aq) -> NaCl (aq) + H2O (l)

acid            base                 salt             water

where (aq) means in aqueous medium and (l) means liquid.

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.