Which of the following is at the highest energy during an endothermic chemical reaction?
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Correct Answer: D. activated complex
During a chemical reaction, enough energy must be absorbed for the reaction to take place. This is termed the activation energy. At the height of the activation energy is the activated complex, which is an intermediate between the reactant and the product. This forms when the reactants have gained enough energy and have collided with the right orientation to start the reaction. It is this activated complex that has the highest energy of the answer options given.
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