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Which of the following processes is exothermic?

Practice Questions

Q1
Which of the following processes is exothermic?
  1. Melting of ice
  2. Dissolving ammonium nitrate in water
  3. Combustion of methane
  4. Evaporation of water

Questions & Step-by-Step Solutions

Which of the following processes is exothermic?
  • Step 1: Understand what an exothermic process is. An exothermic process is one that releases heat into the surroundings.
  • Step 2: Identify the process in the question. The combustion of methane is a chemical reaction where methane (CH4) reacts with oxygen (O2).
  • Step 3: Recognize that during combustion, bonds in methane and oxygen break, and new bonds form in carbon dioxide (CO2) and water (H2O).
  • Step 4: Note that when these new bonds form, energy is released in the form of heat.
  • Step 5: Conclude that since the combustion of methane releases heat, it is an exothermic process.
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