Select all that apply to the property of hardness. Hardness is indicative of the strength of chemical bonds between elements.
Hardness is determined through a complicated process that requires expensive instruments.
Hardness is a physical property Diamond can scratch quartz. Friedrich Mohs developed the standard hardness scale.

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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.