Which type of chemical reaction absorbs energy from its surroundings and requires energy input for the reaction to proceed?

• A. Redox reaction
• B. Combustion reaction
• C. Exothermic reaction
• D. Endothermic reaction

Answer: (D)

Verified step by step guidance

1. Understand the difference between exothermic and endothermic reactions: Exothermic reactions release energy to the surroundings, while endothermic reactions absorb energy from the surroundings.
2. Recall that a reaction that requires energy input to proceed must absorb heat or energy, meaning it takes in energy rather than releasing it.
3. Identify that redox reactions involve electron transfer but do not necessarily specify energy absorption or release; similarly, combustion reactions are typically exothermic, releasing energy.
4. Recognize that the term 'endothermic reaction' specifically describes reactions that absorb energy from their surroundings, requiring energy input for the reaction to occur.
5. Conclude that the correct classification for a reaction that absorbs energy and requires energy input is an endothermic reaction.