"Chapter 1 Key Concepts": HTML5 Crossword

Across

1. Ethanol's chemical formula contains two _____ atoms (6)
3. Risks are determined through exposure and ______ (8)
4. _____ (color) on the Air Quality Index is good air quality (5,0)
7. The element with 47.88 mass is _____ (8)
8. Ozone is ____ when it is higher up in the atmosphere (4)
10. Butane is an example of a _____ (11)
11. Elements that conduct electricity well are _____ (6,0)
12. Number 32 on the periodic table is ______ (9)
13. Air is a ____ (7)
14. Percent is also known as parts per ____ (7)

Down

2. Combustion is the chemical process of _____ (7)
3. 75% of our air is in the ______ (11)
5. On the periodic table, elements in chemical family 7A are known as _____ (8)
6. Maroon on the Air Quality Index is ____ (9)
9. Particulate matter is a ______ air pollutant (9)
11. The 'silent killer' is also known as carbon ______ (8)