Chemistry ch 14
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Chemistry ch 14
polar molecules and molecular attraction
ionic crystals are held together by
the attraction of positive ions and negative ions
what forces hold the atoms in molecules together?
(not electrically charged ions)
Different EN's, so there isn't equal sharing of shared pairs
The highest EN attracts the shared pair more strongly and causes that end to have a partial negative charge.
The other end is partial pos, causiong a polar molecule
In most cases, polar covalent bonds produce what kind of molecules?
A polar molecule is often called a
Q x d
What does a high dipole moment mean?
the intramolecular forces in a molecule are strong, resulting in a higher MP and BP
Can polar covalent bonds be present in a nonpolar molecule? Why?
intermolecular forces (between 2 molecules) and act to hold 2 or more molecules together
van der Waals forces
the attraction of an electron from 1 atom and the proton froma second atom
occur when 2 molecules that normally are dipoles attract
dipole-induced dipole forces
occur when a dipole attracts a nonpolar molecule by inducing this molecule to form a temporary dipole
dispersion or London forces
occur when 2 nonpolar molecu;es attract because of the random movement of their electrons
molecules held by weak forces tend to be
low BP liquids
ligands are what kind of molecules/have what charges?
polar molecules- no charge
or negative ions
when ligands cluster around the central positive ion
number of points of attachment
Most common coordination number
Ni, Pd, Pt, CO
formed with positive ions
Ag, Au, Hg
ligand attaches to the central positive atom at 2 spots
molecular ligands are always
have at least one unshared pair
which names change to latin?
form when complex ions are involved in the formation of a compound.
1st way to form coordination compound
the charge of the positive ion is equal to the total charges of the ligands
2nd way to form a coordination compound
neither the atom nor the ligands have a charge
3rd and most common way to form a coordination compound
complex ions form a compound with 1 or more monoatomic, polyatomic, or complex ion of the opposite charge