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Chem Rules and Formulas Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Chapter 1 Formulas

T(°C) = T(K) - 273.15
T(°F) = 9/5 [T(°C)] + 32
Density = mass/v­olume
average atomic weight = (exact mass of isotope) ( fractional abundance of isotope) + .....

Chapter 1 Conver­sions

1 in
2.54 cm
1 mi
5280 ft

Diatomic Molecules

H2
N2
O2
F2
Cl2
Br2
I2

Polyatomic Ions

  

Chapter 4 Oxidation Numbers

element by itself
0
Group 1A
+1
Group 2A
+2
Halogen
usually -1 / positive with Oxygen
Monatomic Ion
ion charge
H
+1 with nonmetals / -1 with metals
O
usually -2 / -1 in peroxide (O2)
F
ALWAYS -1
 

Chapter 4 Solubility Rules

exceptions
soluble ionic compounds
insoluble ionic compouns
exceptions
 
Na+
OH-
Na+, K+, Ba2+
 
K+
O2-
Na+, K+, Ba2+
 
NH4+
S2-
Na+, K+, NH4+, Ba+
 
NO3-
CO32-
Na+, K+, NH4+
 
CH3CO2-
PO43-
Na+, K+, NH4+
 
ClO3^-
 
ClO4-
Pb2+, Ag+, Hg22+
Cl-
Pb2+, Ag+, Hg22+
Br-
Pb2+, Ag+, Hg22+
I-
Ca+, Sr+, Ba2+, Pb+
F-
Ca+, Sr+, Ba2+, Pb+
SO4^2-