Water (H₂O)

Water (H₂O)

Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.

Chemistry

Keywords

water, dihydrogen oxide, amphoteric, hydrogen bond, dipole, polar, condition for life, V shape, molecular shape, solution, freshwater, drinking water, mineral water, salt water, inorganic chemistry, molecule, chemistry

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Water H₂O

Information

Molar mass: 18.0151 g/mol

Melting point: 0.00 °C (32 °F)

Boiling point: 100.00 °C (212 °F)

Density (at 25 °C or 77 °F): 0.99701 g/cm³ (0.0360 lb/in³)

Molecular shape: V shape

Bond angle: 104.5°

Properties

Water is a colorless, odorless liquid at room temperature. Water molecules are dipoles, with hydrogen bonds and dipole-dipole interactions forming between them. It is a good solvent of both polar and ionic substances. In the solid state, it forms a crystal structure; freezing involves a considerable increase in volume. Water is an amphoteric compound, as it reacts with both acids and bases. It is indispensable for living organisms.

Occurrence and production

70.8% of the Earth´s surface is covered with water. It occurs in nature in the solid, liquid and gas states. Chemically pure water can be obtained by burning pure hydrogen.

Uses

Large amounts of water are used domestically, in agriculture and in industry.

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