Chemistry

Which of the following familiar processes is/are spontaneous? Select all that apply. Multiple select question. A) Water boiling at 0°C and 1 atm. B) Water decomposing to H2 and O2 at 25oC C) A teaspoon of table salt dissolving in 1 L of boiling water D) A ball rolling down a hill

C) A teaspoon of table salt dissolving in 1 L of boiling water D) A ball rolling down a hill

Which of the following must be known in order to assess the spontaneity of a chemical reaction or physical process at a particular set of conditions? Select all that apply. Multiple select question. A) The sign of ΔH only B) Reaction yield C) Change in enthalpy D) Change in entropy

C) Change in enthalpy D) Change in entropy

True or false: If a process occurs spontaneously in one direction under a certain set of conditions, it does not occur spontaneously in the opposite direction under the same conditions.

True: Reason: If a process occurs spontaneously in one direction under a certain set of conditions, it is not possible for the process to also occur spontaneously in the opposite direction under the same set of conditions.

In order to assess the spontaneity of a chemical reaction or physical process both the change in _____________ and ________-associated with the reaction or process must be known.

enthalpy and entropy

Which of the following statements correctly reflect the relationship between the spontaneity of a reaction and the sign of ΔH? Select all that apply. Multiple select question. A)The sign of ΔH alone is not sufficient evidence to determine the spontaneity of a process. B)The spontaneity of a process is easily determined from the sign of ΔH for the reaction. C)A negative value of ΔH favors spontaneity. D)All endothermic processes are nonspontaneous.

A) The sign of ΔH alone is not sufficient evidence to determine the spontaneity of a process. C) A negative value of ΔH favors spontaneity.

The ______- of a system is a measure of the ways in which the energy of the system can be dispersed.

entropy