What does it mean, when a reaction is exothermic?
Correct answer: C. Heat is transferred from the system to the surrounding
- A. Energy content of product is more
- B. Energy content of reactant is less
- C. Heat is transferred from the system to the surrounding
- D. Heat is transferred from the surrounding to the system
Explanation
An exothermic reaction is a chemical reaction that releases energy in the form of heat. This means that the energy content of the products is less than the energy content of the reactants. The heat is transferred from the system to the surroundings, which means that the temperature of the surroundings increases. So the answer is heat is transferred from the system to the surrounding. Here is an example of an exothermic reaction: Burning wood: When wood burns, it releases heat and light. The heat is transferred from the system (the wood) to the surroundings (the air). Here is another example of an exothermic reaction: Neutralization reaction: When an acid and a base react, they produce a salt and water. This reaction releases heat, which can be felt as a warming sensation.
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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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