Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

تمرين 29

INTERPRETING GRAPHICS: The graph below shows the energy in a chemical reaction as the reaction progresses. Use the graph to answer the questions that follow.

The amount of energy needed for this chemical reaction to begin is shown by the line rising from the reactants. What is this energy called?
A) chemical energy
B) electrical energy
C) activation energy
D) mechanical energy