Water

Water molecule

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The water molecule is composed of two hydrogen atoms and one oxygen atom joined by a covalent bond. That is, the two hydrogen atoms and the oxygen atom are bonded together by sharing electrons. Its formula is H2O.

Changes of state

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This animation shows what happens when heat is applied to a block of ice. Notice that the temperature increases until it reaches 0ºC, where it remains stable while the ice melts. The same thing happens at 100°C as the liquid water evaporates.

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Water distillation

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This simulation shows a water distillation unit with different cooling variants.

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Electrolysis of water

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The electrolysis of water is the decomposition of water (H2O) into the gases oxygen (O2) and hydrogen (H2) by means of a direct electric current. To reduce the resistance to the passage of current through water, it is usually acidified by adding a small amount of sulfuric acid or by adding a strong electrolyte such as sodium hydroxide, NaOH.

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