Amazing Facts About Chemistry
* The only elements that are liquid at room temperature are bromine and mercury. However, you can melt gallium by holding a lump in the warmth of your hand.
* Unlike many substances, water expands as it freezes. An ice cube takes up about 9% more volume than the water used to make it.
* If you pour a handful of salt into a full glass of water, the water level will actually go down rather than overflowing the glass.
* There is about 1/2 lb or 250 g of salt (NaCl) in the average adult human body.
* A pure element can take many forms. For example, diamond and graphite both are forms of pure carbon.
* The chemical name for water (H2O) is dihydrogen monoxide.
* The only letter that doesn't appear on the periodic table is J.
* Lightning strikes produce O3, which is ozone, and strengthen the ozone layer of the atmosphere.
* The only two non-silvery metals are gold and copper.
* Although oxygen gas is colorless, the liquid and solid forms of oxygen are blue.
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