Is it possible to have a zero activation energy in a reaction? Explain why.

No, it is generally not possible to have zero activation energy in a chemical reaction because all reactions need some energy to start. Activation energy is the minimum energy needed by reactant particles to collide and start a chemical reaction. 

Without this push, molecules would not rearrange to form products. For example, striking a matchstick provides energy to start the burning process. Even reactions that seem spontaneous require at least a very small activation energy.

Why Zero Activation Energy is Rare

• All bonds need energy to break before new bonds form.
• Even fast reactions like explosions need a spark.
• Enzymes can lower activation energy but cannot make it zero.

Therefore, in real life, zero activation energy is not possible, though some reactions can have extremely low activation energy.