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Activity Discussion Science & Technology What are exothermic and endothermic reactions ? Reply To: What are exothermic and endothermic reactions ?

  • Rhona

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    June 18, 2024 at 3:45 pm
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    Exothermic and endothermic reactions are two types of chemical reactions classified based on the transfer of energy between the system and its surroundings.

    1. Exothermic Reactions:

      • Exothermic reactions are chemical reactions in which the system (reactants) releases energy to the surroundings in the form of heat.
      • In other words, the products of an exothermic reaction have less energy than the reactants, and the excess energy is released to the surroundings as heat.
      • Exothermic reactions are often described as “heat-releasing” reactions.
      • Examples of exothermic reactions include combustion reactions (e.g., burning of wood or gas), neutralization reactions (e.g., mixing an acid and a base), and certain chemical reactions in living organisms (e.g., cellular respiration).
    2. Endothermic Reactions:

      • Endothermic reactions are chemical reactions in which the system (reactants) absorbs energy from the surroundings in the form of heat.
      • In other words, the products of an endothermic reaction have more energy than the reactants, and the system must absorb energy from the surroundings to drive the reaction.
      • Endothermic reactions are often described as “heat-absorbing” reactions.
      • Examples of endothermic reactions include photosynthesis (where plants use light energy to convert carbon dioxide and water into glucose and oxygen), the decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2), and the melting of ice.

    The distinction between exothermic and endothermic reactions is important in understanding the energy changes that occur during chemical processes and their practical applications in various fields, such as chemistry, biology, and engineering.

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