In an endothermic reaction, where does the energy required for the reaction come from?

• A. It is released by the reactants.
• B. It is generated internally within the system.
• C. It is absorbed from the surroundings.
• D. It is produced by the products.

Answer: (C)

Verified step by step guidance

1. Understand the definition of an endothermic reaction: it is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.
2. Recall that in an endothermic process, the system (the reacting substances) requires energy input to proceed because the bonds being broken require more energy than the bonds being formed.
3. Recognize that this energy cannot be generated internally by the reactants or products; instead, it must come from an external source.
4. Identify that the surroundings provide this energy, which is absorbed by the reactants to drive the reaction forward.
5. Conclude that the correct statement is: the energy required for an endothermic reaction is absorbed from the surroundings.