Question

After observing the graph, which statement tells that the chemical reaction is exothermic?

• A. The potential energy at point 2
• B. The energy difference between points 1 and 2
• C. The time elapsed between points 2 and 3
• D. The energy difference between points 1 and 3
  
• E. The time needed to reach point 3
  

Answer 1

The correct option is D The energy difference between points 1 and 3

The energy difference between points 1 and 3 tells that the chemical reaction is exothermic.
The energy at point 1 is higher than the energy at point 3.
Hence, when the reaction proceeds, heat is given out.
Hence, the reaction is exothermic.