Reactants have high energy than products in:
Correct answer: A. Exothermic reactions
- A. Exothermic reactions
- B. Endothermic reactions
- C. Photochemical reactions
- D. Non-spontaneous reactions
Explanation
In exothermic reactions, the energy of the reactants is higher than that of the products. This results in the release of energy, usually as heat, making the products more stable and lower in energy. This is why exothermic reactions are often exergonic, releasing energy to the surroundings. Endothermic reactions, on the other hand, absorb energy, leading to products with higher energy than the reactants. Photochemical reactions involve light energy to drive the reaction and can vary in their energetic nature. Non-spontaneous reactions require external energy to proceed and do not inherently relate to the energy levels of reactants and products as described.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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