module 16 Flashcards
oxidation number
the CHARGE that an ATOM in a molecule would develop IF the most ELECTRONEGATIVE ATOMS in the molecule TOOK the SHARED ELECTRONS from the LEST ELECTRONEGATIVE atoms
the sum of all oxidation numbers in a molecule must
equal the charge of that molecule
when a substance has only one type of atom in it, the oxidation number for that atom is equal to
charge of the substance/ # atoms present
group 1A metals always have oxidation numbers of
+1 when in molecules with more than 1 type of atom
group 2A metals always have oxidation numbers of
+2 when in molecules with more than 1 type of atom
Flourine always has a oxidation number of
-1 when in a molecule with more than one type of atom
when grouped with just one other atom which is metal, H has an oxidation number of -; in all other cases in which it is grouped with other atoms it is-
-1
+1
oxygen has an oxidation number of – when in molecules with more than 1 type of atom
-2
if all else fails, assume that the atom’s oxidation number is the same as
what it would take on in an ionic compound
oxidation
the process by which an atom LOSES electrons
reduction
the process by which an atom GAINS electrons
when a redox reaction occurs, there will always be
one atom that is oxidized and one that is reduced
anode
the negative side of the battery
anions
negative ions in a battery
cathode
positive side of a battery
