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In an exothermic reaction, what happens to the enthalpy of the system?

Practice Questions

Q1
In an exothermic reaction, what happens to the enthalpy of the system?
  1. It increases.
  2. It decreases.
  3. It remains constant.
  4. It becomes zero.

Questions & Step-by-Step Solutions

In an exothermic reaction, what happens to the enthalpy of the system?
  • Step 1: Understand what an exothermic reaction is. It is a type of chemical reaction that releases heat to the surroundings.
  • Step 2: Recognize that when heat is released, the energy of the system decreases.
  • Step 3: Know that enthalpy (ΔH) is a measure of the total energy of a system, including heat content.
  • Step 4: Since the system is losing heat in an exothermic reaction, the enthalpy of the system decreases.
  • Step 5: Conclude that in an exothermic reaction, the change in enthalpy (ΔH) is less than zero (ΔH < 0).
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