Chemistry

# Dangerous Chemistry

Tap water is a great conductor of electricity. However, distilled water (i.e. pure $\ce{H2O}$) isn't. Why is this the case?

Airships can float in the air when filled with low density gases, like hydrogen or helium. Hydrogen was commonly used in the early 20th century, but is now considered dangerous. Why is hydrogen dangerous to use?

Why is it important that scuba divers ascend to the surface slowly and gradually?

When our eyes get injured by corrosive agents (acids), we wash them out using neutral solutions (like normal saline, i.e. salt water) instead of bases. Why should we not use bases to neutralize the acid?

Why does potassium react more vigorously with water compared to sodium?

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