Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place?

The correct option for above statement is

a.from a gas to a liquid

Explanation:

A liquid will be regenerate to a gas by heating. A gas will be regenerate into a liquid by increasing the pressure of a gas sample. A liquid will be regenerate to a gas by cooling. A gas will be regenerate into a liquid by cooling.

Explanation:

In vapor state of water, molecules are far apart from each other as they have high kinetic energy. Hence, they move rapidly from one place to another. Therefore, the molecules are far apart from each other.

Whereas when the speed of molecules slow down then gaseous (or vapor) state of water changes into liquid state. As decrease in kinetic energy of molecules will bring them closer to each other.

Hence, we can conclude that change of state that has most likely taken place is liquid state.

screening

explanation:

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.