CH. 19
The melting & boiling points of a _____ molecule are much higher than those of a _____ molecule.
polar, non-polar
What percentage of water are human bodies?
60-75%
What percentage of Earth's surface is water?
75%
Frozen water (ice) has a organized structure that resembles what? Why?
A honeycomb; each water molecule forms hydrogen bonds with 4 other molecules
As temperature ____, the organized structure of the hydrogen bonds among water molecules ____.
Decreases, increases
An intermolecular force between the hydrogen on one molecule to an atom on another molecule
Hydrogen bond
As temperature ____, the organized structure of the hydrogen bonds among water molecules ____.
Increases, decreases
Other two pairs of electrons not involved in forming chemical bonds
Lone pairs
What type of molecule is methane (CH4)?
Non-polar
Molecule that doesn't have distinctly charged poles
Non-polar molecule
What type of molecule is ammonia (NH3)?
Polar
What type of molecule is water?
Polar
Molecule that has a negative & positive end or pole
Polar molecule
What is the shape of a water molecule?
Pyramid/ Tetrahedron/ V
Are hydrogen bonds relatively weak or strong? Why?
Weak; they constantly break & reform as water molecules collide
Two pairs of electrons involved in forming chemical bonds
Bonding pairs
What is the chemical formula for water?
H2O