What is true of a reaction that has reached equilibrium? The reaction rate is zero.

The reaction rates of the forward and reverse reactions are equal.

The rate of the forward reaction is greater than the rate of the reverse reaction.

The rate of the forward reaction is less than the rate of the reverse reaction.

just did the assignment and the answer was #1 +2 n

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.