A Chemistry Quiz For Nerdy Bloggers

Hi!

Here's a quiz I have created, mostly for the fact that I recently had the happy discovery that I can make little subscripts with the <sub> tag.

So, please answer with the chemical name, as well its common role or usage (include its "street" name, if one exists).

Example:
NaCl would be sodium chloride, more popularly known as salt, which is used to make things more savory and happy.

1. CO
2. CO₂
3. MgOH
4. N₂O
5. H₂O
6. H₂O₂
7. FeS₂
8. NaHCO₃
9. KC₄H₄O₆
10. C₁₂H₂₂O₁₁