Which of these processes is spontaneous? a. the combustion...

Which of these processes is spontaneous?

a. the combustion of natural gas

b. the extraction of iron metal from iron ore

c. a hot drink cooling to room temperature

d. drawing heat energy from the ocean's surface to power a ship

Key Concepts

Spontaneous Process

A spontaneous process is one that occurs naturally without the need for continual external energy once initiated. It is determined by thermodynamic factors such as energy changes and entropy variations, and even though a spontaneous process may require an activation energy to overcome initial barriers, it ultimately proceeds on its own without sustained energy input.

Gibbs Free Energy

Gibbs free energy (?G) is a thermodynamic quantity that combines enthalpy and entropy to predict the spontaneity of a process at constant temperature and pressure. A negative ?G indicates that the process is energetically favorable and will occur spontaneously, while a positive ?G signifies that the process is non-spontaneous under those conditions.

Second Law of Thermodynamics

The second law of thermodynamics states that in any spontaneous process, the total entropy of the universe increases. This concept explains why processes that lead to a greater disorder or dispersal of energy are favored, providing a fundamental basis for understanding why certain processes occur naturally.

Activation Energy

Activation energy is the minimum energy required to initiate a chemical reaction or physical process. Even if a process is spontaneous overall, it may still require this energy input to overcome an energy barrier and reach the transition state, after which the process proceeds without additional energy.

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