4. Water.pdf - Untitled Document 1 of 4 https/lms.virtualhighschool.com/content/OSSD-v2/Department/Scien Listen Water Water is one of the most important

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Water Water is one of the most important molecules as it is essential to all life. Water is important in metabolic reactions, but it also helps in many other ways such as: providing a solvent to dissolve substances into, lubrication of joints, cellular structure and support. Water consists of two hydrogen atoms bonded to one oxygen atom ( H O ). The bond between the hydrogen atom and oxygen atom is polar due to the strong electronegativity of the oxygen atom. The resulting structure of the water molecule is asymmetrical, not only due to the polarity, but due to the repulsions of same charged atoms away from each other. The area around the oxygen atoms is negative while the area around the hydrogen atom tends to be positive. Because of this polarity, the water molecules strongly attracts other molecules including other water molecules. A strong attractive force found between two molecules is called an intermolecular force. Intermolecular forces are weaker than ionic and covalent bonds. Intermolecular forces are affected when matter changes from a solid to a liquid state. When ice melts, energy (heat or pressure) is being added to the system. This energy causes the water molecules in the ice to move. This disrupts the strong intermolecular forces in the solid form (ice), and results in the liquid form of water. There are three types of intermolecular forces: London forces, dipole-dipole forces, and hydrogen bonds . These three different forms are collectively called van der Waals forces.
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