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6 Cards in this Set

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Describe Electronegativity; How does it relate to water molecules?
Electronegativy is an element's tendency to attract elections of a chemical bond towards itself. In a water molecule, Oxygen is electronegative--meaning it attracts electrons, which is why it has two pairs of free electrons, it also allows for the H20 molecule to be polar covalent, and form Hydrogen bonds with other H20 molecules
Why is a water molecule considered Polar Covalent?
Because it contains one atom that is slightly more electronegative than the other; polar covalent bonds are very strong; requiring 200-400 KJ of energy to be broken
What is the root of all of water's unusal properties? (such as high boiling point, high heat of vaporization, etc)
Hydrogen Bonds; the bond between negative oxygen and positive hydrogen; high boiling point is due to high number of hydrogen bonds
Why is water a good solvent?
Because it can separate ionic bonds in ionic compounds; pulling apart ions from crystals, which is hard to do because of their high melting point
What kind of molecule is water? What is its geometry?
Triatomic molecule; tetrahedral and bent
What are the main biological decontaminants of water?
Aerobic (with oxygen) and Anaerobic (without oxygen); also, runoff from fertilizers, cleaners, detergents, pesticides