Water.pdf

Hydrogen bonds and solubility of substances having no

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Hydrogen bonds and solubility of substances Having no affinity for water Having an affinity for water Interesting fact: Soap has a hydrophilic head and a hydrophobic tail which allows it to dissolve in both waters and oils, therefore allowing the soap to clean a surface.
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Solutions and Suspensions Water is usually also part of a mixture Solution Ionic compounds dispersed as ions in water Evenly distributed Solute substance that is being dissolved Solvent substance into which the solute dissolves Suspension Substances that don’t dissolve but separate into tiny pieces Water keeps the pieces suspended
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2) High heat capacity and heat of vaporisation The polarity of water causes water molecules to attract each other with the formation of weak hydrogen bonds . Hydrogen bonds formed within water give it a high stability, which means a large amount of energy is required to raise the temperature of water. A lot of heat is needed to evaporate water (liquid state) to steam or vapour (gaseous state). Has a high specific heat capacity of 4.2 J g ‒1 K −1 (the amount of heat required to raise 1 gram of a compound by 1°C). This means water is able to absorb a large amount of heat without its temperature going up.
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Water helps to maintain a stable temperature to keep the environment temperature and the internal temperature of organisms stable medium for chemical reactions (generally affected by a change in temperature) cell contents and their environment do not freeze easily. The evaporation of water creates a cooling effect and prevents terrestrial organisms from overheating. (coolant effect)
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High Heat of Vaporization Water vapor forms a ‘blanket’ in the Earth’s atmospheric layer Heat radiated from the sun is absorbed and held by the vapor helps keep the Earth warm
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  • Fall '19
  • Atom, 1 gram, Universal Solvent

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