| | Common Molecules | | | Across | | | 4. | | What is the common name for H2O? | | | 5. | | What is the common name for O3? | | | 6. | | What is the common name for CO2? | |
| | | Down | | | 1. | | What is the common name for CH4? | | | 2. | | What is the common name for HCl? | | | 3. | | What is the common name for CO? | | | 7. | | What is the common name for NH3? | |
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