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Which of the following reactions has a negative enthalpy change?

Practice Questions

Q1
Which of the following reactions has a negative enthalpy change?
  1. Dissolving NaCl in water
  2. Photosynthesis
  3. Respiration
  4. Melting of ice

Questions & Step-by-Step Solutions

Which of the following reactions has a negative enthalpy change?
  • Step 1: Understand what enthalpy change means. It refers to the heat content of a reaction.
  • Step 2: Know that a negative enthalpy change means the reaction releases energy.
  • Step 3: Identify the type of reaction that typically has a negative enthalpy change. Exothermic reactions release energy.
  • Step 4: Recognize that respiration is an example of an exothermic reaction.
  • Step 5: Conclude that since respiration releases energy, it has a negative enthalpy change.
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