Ch 2.2 : Properties of Water
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Properties of Water
Water molecules are slightly polar because hydrogen and oxygen atoms within it form polar covalent bonds • Substances that readily form bonds with water (dissolves) are hydrophilic (“water-loving”) • Substances that repel water are hydrophobic (“water-fearing”)
Hydrophilic
Substances that readily form bonds with water (dissolves) are hydrophilic (“water-loving”)
Hydrophobic
Substances that repel water are hydrophobic (“water-fearing”)
Water as a Heat Sink • Lots of energy • Evaporate • Cooled , insulation
It takes a lot of energy to break the bonds within a water molecule • Water doesn’t evaporate until it reaches a high temperature • When cooled, ice floats and it provides insulation for the water underneath
The Universal Solvent • Hydrogen b –> Absorb & release HE • Polarity –> attracted to • Passes through –> move
The hydrogen bonds in water allow it to absorb and release heat energy more slowly than other substances • Water’s polarity means it is attracted to many different types of molecules • When water passes through locations (air, ground, plant/animal etcs) it can move particles, such as chemicals and minerals
Surface Tension
Means that there is greater attraction of water molecules to each other than to air molecules