| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | chloroform | United States | Historically used as an anesthetic in medical procedures | 1 |
| 2 | chloroform | United States | Chloroform was historically used as an anesthetic in the 19th century. | 1 |
| 3 | chlorophyll molecule | United States | Chlorophyll molecule is commonly associated with photosynthesis and plant biology. | 1 |
| 4 | chloropicrin | United States | Chloropicrin is primarily known as a soil fumigant in agriculture, commonly used to control soil-borne pathogens and pests. | 1 |