| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | chemical reaction | Chemistry research community | Basis of experimental investigation and innovation | 1 |
| 2 | chemical reaction | chemistry studies | Process that leads to the transformation of one set of chemical substances to another | 1 |
| 3 | chemical reactions | Chemistry research | Studied for understanding energy changes, reaction mechanisms, and synthesizing new compounds | 1 |