Reaction Coupling

Definition

A phenomenon where an energetically unfavorable reaction (endergonic) is driven by a favorable one (exergonic), allowing the overall process to occur.

Analogy

Imagine you're at a theme park. You really want to go on a scary roller coaster ride (unfavorable reaction), but you're too scared to do it alone. Your friend, who loves thrill rides (favorable reaction), agrees to join you. Their enthusiasm drives your decision, and together, you both end up enjoying the ride!

Related terms

Endergonic Reaction: A chemical reaction that requires energy input; like needing courage to get on that scary roller coaster.

Exergonic Reaction: A chemical reaction that releases energy; similar to your friend's excitement about the roller coaster.

Free Energy: The energy in a system available for work; think of it as the combined courage and excitement between you and your friend which allows you both to enjoy the ride!