What is a word that describes and summarizes what happens in chemisrty?

There isn't one single word that perfectly encapsulates all of chemistry. However, depending on the specific aspect you want to emphasize, here are some options:

General:

* Transformation: This highlights the fundamental process of changing substances through chemical reactions.

* Interaction: This emphasizes the way atoms and molecules interact and bond.

* Composition: This focuses on the makeup of matter and the elements that comprise it.

* Structure: This emphasizes the arrangement of atoms and molecules within substances.

More Specific:

* Reaction: This focuses on the specific processes of chemical change.

* Bonding: This emphasizes the forces that hold atoms together.

* Synthesis: This refers to the creation of new substances.

* Analysis: This focuses on the breakdown and study of substances.

Ultimately, the best word to use depends on the specific context and what you want to emphasize about chemistry.