What occurs during a chemical reaction?

During a chemical reaction, energy is often involved, and it can manifest in various forms, such as heat or light. The requirement for energy input, particularly from heat or light, is a key aspect of many chemical reactions. For example, in endothermic reactions, energy is absorbed from the surroundings, leading to a net input of energy to drive the reaction. This is why stating that a reaction requires energy is accurate and reflects a fundamental principle in chemistry.

In certain reactions, especially those that are endothermic, heat energy is absorbed, while others might require light energy, like photosynthesis in plants. Thus, the correct answer captures the essential role of energy dynamics in facilitating chemical transformations. Understanding this context is crucial for grasping the principles behind various chemical processes and their applications in fields like nail technology, where certain products and treatments rely on specific chemical reactions.