True or false: All chemical reactions involve energy transfer.

True. All chemical reactions involve the transfer of energy. Energy can be absorbed or released during a chemical reaction. Endothermic reactions absorb energy from the surrounding environment, whereas exothermic reactions release energy to the surrounding environment.

In the realm of chemistry, energy is a key player in the making and breaking of chemical bonds. Chemical reactions involve the rearrangement of atoms and, in the process, the chemical bonds between these atoms can either absorb or release energy. In the case of exothermic reactions, such as combustion, the reaction releases more energy than is required to start it, often in the form of heat or light. On the other hand, endothermic reactions, such as photosynthesis, require an input of energy to proceed. Additionally, the Law of Conservation of Energy states that energy is neither created nor destroyed in a chemical reaction, rather it is transferred or transformed from one form to another, which aligns with the concept that all chemical reactions involve energy transfer. The study of these energy changes in chemical reactions is known as chemical thermodynamics, which provides insight into the feasibility and spontaneity of reactions. Understanding the energy changes that occur during a reaction is crucial for a range of applications, from industrial synthesis to biological processes.