The energy available to perform work.Group of answer choicesthermal energyactivation energyentropychemical energyfree energyNext

The question seems to be asking about a concept in thermodynamics or chemistry related to the form of energy that can be used to perform work. The correct answer from the provided options is free energy.

Explanation:

1. Thermal Energy: This refers to the energy that comes from the temperature of a substance. It is often not available to do work in many contexts.

2. Activation Energy: This is the minimum amount of energy required to start a chemical reaction, but it is not specifically categorized as energy available for work.

3. Entropy: This is a measure of disorder or randomness in a system, and while it relates to energy dispersal, it does not represent energy available to perform work.

4. Chemical Energy: This is stored in the bonds of chemical compounds but may not be directly translating to the capacity to do work unless it is released in a process.

5. Free Energy: This is the amount of energy in a system that can be utilized to perform work. It is defined by the equation $G = H - TS$, where $G$ is the Gibbs free energy, $H$ is enthalpy, $T$ is temperature, and $S$ is entropy.

Final Answer

The energy available to perform work is free energy.