Chemistry

Chemistry Subject Matter:

Atoms:
Who invented the mole?
The Law of Definite Proportions vs. The Law of Multiple Proportions

Chemical Reactions:
What is a Catalyst?

Elements:
How many elements are on the periodic table?
Why do Noble Gases rarely form bonds with other atoms?
How many bonds can hydrogen form?
What type of bond is joining two hydrogen atoms?
How many valence electrons are in an atom of Phosphorus?
How many valence electrons does Carbon have?

Ions:
Cations Explained

Molecules:
Polar vs. Nonpolar Molecules
Covalent Network Solids
Atomic Solids
Selenium Tetrabromide

Notation:
Isotope Notation
The Lewis Dot Structure for CH4
The Lewis Dot Structure for CO2
The Lewis Dot Structure for H2O
The Lewis Dot Structure for HCN
The Lewis Dot Structure for NH3
The Lewis Dot Structure for NH4+
The Lewis Dot Structure for O2

Polarity Series: CO2, H2, NH3, CCl4, CH4, H2O, C2H2, SO2, BF3, CS2, H2S, HCl, IF5, CF4, CH2Cl2, CH2O, CH3Cl, HCN, N2, SO3, BCl3, CH3OH, CHCl3, NO3, O2, PCl3, SF4, XeF4, Cl2, HBr, NF3, NO2, OF2, SCl2, SF6, BeCl2, hexane, ethanol, C2H4, NOCl, NH4+, PCl5, PF3, BH3, Br2, BrF3, CBr4, H3O+, HF, NaCl, NO2+, SCN, XeF2, acetone, BrF5, CH3F, ClF3, CO, methanol, NCl3, oil, NH2, O3, PF5, PH3, SF2, SiF4, CH2F2, lipids, C2H6, CH3Br, CN, H2O2, I2, OH, SiCl4, BeF2, benzene