I've learnt... (In binary covalent nomenclature tutorial)
-Converting Formulas to Names

-. Organic compounds, like methane, CH4, ethane, C2H6, and propane, C3H8, are named by a systematic procedure.

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water - H2O
ammonia - NH3
methane - CH4
ethane - C2H6
propane - C3H8

I've learnt... (In cation names and formulas tutorial)
-Metallic atoms hold some of their electrons relatively loosely, and as a result, they tend to lose electrons and form cations. In contrast, nonmetallic atoms attract electrons more strongly than metallic atoms, and so nonmetals tend to gain electrons and form anions.

-The fact that the noble gas atoms do not gain, lose, or share their electrons suggests there must be something especially stable about having 2 (helium, He), 10 (neon, Ne), 18 (argon, Ar), 36 (krypton, Kr), 54 (xenon, Xe), or 86 (radon, Rn) electrons.

-The names of monatomic cations always start with the name of the metal, sometimes followed by a Roman numeral to indicate the charge of the ion. For example, Cu+ is copper(I), and Cu2+ is copper(II).

I've learnt... (Anions names and formulas tutorial)
-Metallic atoms hold some of their electrons relatively loosely, and as a result, they tend to lose electrons and form cations.

-The positive cations and the negative anions attract each other to form ionic bonds.

-Polyatomic ions are named with the word hydrogen in front of the name of the anion if there is one H+ ion attached and dihydrogen in front of the name of the anion if two H+ ions are attached.

I've learnt...(in ionic nonenclature tutorial)
-Metal‑nonmetal: Ionic compounds whose formula contains one symbol for a metal and one symbol for a nonmetal are called binary ionic compounds.

-Metal‑polyatomic ion: Polyatomic ions can take the place of monatomic anions, so formulas that contain a symbol for a metallic element and the formula for a polyatomic ion represent ionic compounds.

-Ammonium‑nonmetal or ammonium‑polyatomic ion: Ammonium ions, NH4+, can take the place of metallic cations in an ionic compound, so chemical formulas that contain the formula for ammonium with either a symbol for a nonmetallic element or a formula for a polyatomic ion represent ionic compounds.

I've learnt..(in Balancing Chemical Equations Tutorial)
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Consider the first element listed in the first formula in the equation.
If this element is mentioned in two or more formulas on the same side of the arrow, skip it until after the other elements are balanced.
If this element is mentioned in one formula on each side of the arrow, balance it by placing coefficients in front of one or both of these formulas.
Moving from left to right, repeat the process for each element.
When you place a number in front of a formula that contains an element you tried to balance previously, recheck that element and put its atoms back in balance.
Continue this process until the number of atoms of each element is balanced.

My first entry.
Went to O Hub during chemistry's lesson.