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"Chapter 1 Key Concepts": HTML5 Crossword

Across

3. _____ (color) on the Air Quality Index is good air quality (5,0)
4. Ozone is ____ when it is higher up in the atmosphere (4)
6. Number 32 on the periodic table is ______ (9)
8. Particulate matter is a ______ air pollutant (9)
11. Elements that conduct electricity well are _____ (6,0)
12. Butane is an example of a _____ (11)
14. Ethanol's chemical formula contains two _____ atoms (6)
15. The element with 47.88 mass is _____ (8)

Down

1. Combustion is the chemical process of _____ (7)
2. On the periodic table, elements in chemical family 7A are known as _____ (8)
5. 75% of our air is in the ______ (11)
7. Risks are determined through exposure and ______ (8)
9. Maroon on the Air Quality Index is ____ (9)
10. The 'silent killer' is also known as carbon ______ (8)
11. Air is a ____ (7)
13. Percent is also known as parts per ____ (7)

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