Which energy change occurs during an endothermic chemical reaction?

• A. Energy is converted entirely into work.
• B. Energy is absorbed from the surroundings.
• C. Energy is released to the surroundings.
• D. No energy change occurs.

Answer: (B)

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 gains energy, which means energy flows into the system rather than being released.
3. Recognize that the energy absorbed is not converted entirely into work; instead, it increases the internal energy of the system.
4. Compare this with exothermic reactions, where energy is released to the surroundings, which is the opposite of what happens in endothermic reactions.
5. Conclude that the correct energy change during an endothermic reaction is that energy is absorbed from the surroundings.