+ CHEMISTRY +

Memorize the ffg for the periodical test tomorrow in Chemistry:

Oxidation Numbers:

H = 1
Al = 3

Sn = 2
= 4

Cu = +1
= +2

Se = -2

S = -2

Fe = 2
= 3

F = -1

Sr = +2

Ba = +2

ClO4 raised to -1 = perchlorate
CN raised to -1 = Cyanide
SO3 raised to -2 = Sulfite
HCO3 raised to negative 1 = Bicarbonate