| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | na2s | Chemistry | Sodium sulfide, commonly used in chemistry experiments and industrial processes. | 1 |
| 2 | nicl2 | chemistry | Used as a source of nickel ions in chemical reactions and experiments. | 1 |
| 3 | nicl2 | chemistry community | NiCl2 is a common chemical compound used in laboratory experiments and industrial processes. | 1 |