WAEC Chemistry 2011 Objective — Question 26

Question 26 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Consider the following energy profile diagram: X represents

• A. A. activated complex
• B. B. activation energyCorrect
• C. C. enthalpy change
• D. D. energy of reactant

Explanation

X represents the activation energy - the minimum amount of energy required for a reaction to occur, shown as the energy 'hump' between reactants and products on the diagram.

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