water????what is water???? :)
Structure of a water molecule
- A water molecule consist of an oxygen atom and two hydrogen atom
- The two hydrogen atoms are combined with the oxygen atom by sharing of electrons
- The three atoms form a triangle, not a straight line
- The water molecule is electrically neutral but there is a net
negative charge on the oxygen atom and a net positive charge on both
hydrogen atoms.
- A molecule carrying such an unequal distribution of electrical charge is called a polar molecule.
- The positively charged hydrogen atoms of one water molecule are
attracted to the negatively charged oxygen atoms of nearby water
molecules by forces called hydrogen bonds.
- Hydrogen bonds largely account for the unique properties of water. weaker than covalent bonds.
- But -> strong enough to hold water molecules together.
- Because of their hydrogen bonds, water molecules are attracted to charged particles or charged surfaces.
Properties of water
- polar molecule acts as universal solvent
- Low viscosity of water
- High specific heat capacity
- Latent heat of vaporization of water
- Effect of temperature on water density
- High Surface Tension - adhesive and cohesive forces
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