Sodium bicarbonate, commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO₃. It is a salt composed of a sodium cation and a bicarbonate anion. Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder. It has a slightly salty, alkaline taste […]
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Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics,
A chemical element, often simply called an element, is a species of atoms which all have the same number of protons in their atomic nuclei. Atomic number Symbol Name Phase at r.t. 1 H Hydrogen gas 2 He Helium gas 3 Li Lithium solid 4 Be Beryllium solid 5 B Boron solid 6 C Carbon solid 7 N Nitrogen gas 8
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