Chemistry Crossword

3. The process in a reaction where energy in the form of heat is released.
5. This is the smallest type of particle.
6. The only form of iron corrosion.
8. The scientific term for 'burning'.
9. A particle with a net charge.
10. This is what the the three things needed for fire are collectively known as.
12. The process in a reaction where energy in the form of heat is absorbed.
14. This gas takes up roughly 21% of Earth's atmosphere.
15. This gas is the most abundant gas in the Earth's atmosphere.

1. A substance composed of two or more elements that are chemically combined together
2. A substance that is combined of two or more elements chemically combined together.
4. This is the most common greenhouse gas.
7. This is the process of which people use to stop iron corrosion, by strengthening the material.
11. This type of matter is listed on the periodic table.
13. A substance composed of two or more atoms of different elements.