Question

what type of energy change is represented by this diagram?

• endothermic
• kinetic
• exothermic
• nuclear

Explanation:

Compare reactant and product energy levels

$$ E_{\text{reactants}} > E_{\text{products}} $$

Determine the sign of enthalpy change

$$ \Delta H = E_{\text{products}} - E_{\text{reactants}} < 0 $$

Classify the energy change

Since energy is released, the reaction is exothermic.

Answer:

• endothermic
• exothermic (Correct answer)
• kinetic
• nuclear