NAMING COVALENT COMPOUNDS

Binary Compounds of Two Nonmetals
Given Formula, Write the Name
We will discuss how to name binary compounds from the formula when two nonmetals are involved.
In this compound, you do not even need to know the charges, because it is a covalent compound, no metal here. Use Greek number for prefix. Here are the first ten:
one mono- six hexa-
two di- seven hepta-
three tri- eight octa-
four tetra- nine nona-
five penta- ten decen a-
1. N2O Dinitrogen oxide
2. Cl2O7 Dichlor heptoxide
Given Name, Write the Formula
1. Nitrogen dioxide, NO2
2. Carbon tetrachloride, CCl4

NAMING IONIC COMPOUNDS

In naming ionic compounds, there are some rules. The first rule is proposed for ionic compounds which have a single cation and a single anion, so this compound consists of 2 different elements, metal and non metal. This compound can be grouped as a binary ionic compound. There is a different binary compound, i.e. a covalent compound.
Binary Compounds of Cations with a single charge.
Given Formula, Write the Name
In your textbook there is a table contains list of cations and anions.
1. Na+ and Cl- forms NaCl, sodium chloride
2. Na+ and O2- forms Na2O, sodium oxide
3. Al3+ and F- forms AlF3, aluminium fluoride
Please remember that all elements involved in the compounds have ONLY ONE charge. It includes both the cation and the anion involved in the formula.
The order for naming a binary compound is first the cation, then the anion.
Use the name of cation with a fixed charge directly from the periodic table.
The name of the anion will be made from the root of the element's name plus the suffix "-ide."
Given Name, Write the Formula
The order for writing a formula is first the cation, then the anion.
You have to know the charges of each cation and anion.
The sum of the positive charge and the sum of the negative charges must add up to zero, because compound is neutral.
You may adjust the subscripts to get a total charge of zero. Don't change the charge of each ion.
1. Potassium sulfide, K2S
2. Barium bromide, BaBr2
Binary Compounds of Cations with Variable Charges
Given Formula, Write the Name
The cations involved at least have 2 charges. In your texbook there is a list of cations with variable charges. For example : Cu +1 and +2; Fe +2 and +3; Hg +1 and +2; Pb +2 and +4; Sn +2 and +4; Au +1 and +3.
1. FeCl2, Iron(II) chloride
2. Cu2O, Copper(I) oxide
Polyatomic Compounds
There are polyatomic cations and anions. This compound consists of monoatomic cation and polyatomic anion or polyatomic cation and monoatomic anion or both cation and anion are polyatomic.
1. K2SO4, Potassium sulphate
2. (NH4)2S, Ammonium sulfide
3. NH4NO2 Ammonium nitrite

CHEMISTRY NOMENCLATURE QUIZ Part II

1.What is the chemical name of MnCl2?
a.Manganese perchlorite
b.Manganese chlorite
c.Manganese chlorate
d.Manganese chloride
e.Manganese(II) chloride
2.What is the chemical names of Fe3 (PO4)2?
a.Iron (II) phosphide
b.Iron (III) phosphite
c.Iron (II) phosphite
d.Iron (III) phosphate
e.Iron (II) phosphate
3.What is the chemical name of BaS?
a.Barium sulfite
b.Barium sulfoxide
c.Barium sulfate
d.Barium sulfur
e.Barium sulfide
4.What is the chemical name of Mg3N2?
a.Magnesium nitride
b.Magnesium nitrate
c.Magnesium nitrite
d.Magnesium nitrade
5.Magnesium from group IIA in the periodic table, burns brightly in air to form oxide. The formula and name of this oxide are ….
a.Mg3O, magnesium(III) oxide
b.Mg2O, dimagnesium oxide
c.MgO, magnesium oxide
d.MgO2, magnesium dioxide
e.MgO3, magnesium oxide
6.The correct name of the following ionic compounds is ….
a.K+ and CO32- : sodium carbide
b.Ca2+ and NO3- : potassium nitride
c.Ba2+ and SO42 - : barium sulfate
d.Al3+ and CO32 - : aluminium carbide
e.Mg2+ and PO33- : magnesium fosfide
7.The correct statement about acid and base is ….
a.an acid is a cation
b.a base is an anion
c.an acid is an ionic compound
d.a base is a covalent compound
e.an acid produces hydrogen ion when dissolved in water
8.The formula of hydrochloric acid is ....
a.HCl
b.HOCl
c.ClO
d.ClO2
d.HClO2
9.The correct formula of base is ....
a.SOH
b.BrOH
c.Ca(OH)2
d.CH3OH
e.CH3COOH
10.If an acid releases a hydrogen ion, the result of the other ion is ....
a.cation
b.hydroxide
c.anion
d.negative ion
e.positive ion

CHEMISTRY NOMENCLATURE QUIZ Part I

1.Loss of an electron by a neutral atom results in the formation of ….
a.a cation
b.an isotope
c.an anion
d.a polyatomic ion
e.a nucleus
2.A cation has a positive charge because ….
a.there are fewer electrons than protons
b.there are more electrons than protons
c.the neutrons in the nucleus are charged
d.there are fewer neutrons than protons
e.it has a positively charged nucleus
3.Gain of an electron by a neutral atom results in the formation of ….
a.an anion
b.a cation
c.an isotope
d.a nucleus
e.a polyatomic ion
4.What is the symbol for the phosphate ion?
a.PO4-
b.PO34-
c.PO43-
d.PO-
e.PO33-
5.What is the symbol for the chlorate ion?
a.ClO42-
b.ClO2-
c.ClO3-
d.ClO4-
e.ClO32-
6.What is the symbol for the nitrate ion?
a.NO2-
b.NO32-
c.NO3-
d.NO-
e.NO23-
7.What is the symbol for the bisulfate ion?
a.HSO42-
b.H2SO4-
c.HSO32-
d.HSO3-
e.HSO4-
8.What is the symbol for the perchlorate ion?
a.ClO23-
b.CrO4-
c.ClO-
d.ClO3-
e.ClO4-
9.What is the symbol for the carbonate ion?
a.CO3-
b.CO-
c.CO22-
d.CO2-
e.CO32-
10.The correct formula of non-metal oxide is ….
a.Na2O
b.Li2O
c.BaO
d.SO2
e.SrO
11.Metal M, with atomic number 20, has an oxide with formula ….
a.M3O2
b.M2O
c.MO
d.MO3
e.M2O3
12.The correct formula for the ionic compound which is formed from K+ and S2- is ….
a.KS
b.K2S
c.KS2
d.SK
e.SK2
13.What is the chemical formula for gold (III) oxide?
a.Au2O3
b.Au3O
c.AuO3
d.Au3O2
e.AuO
14.What is the chemical formula of tin (IV) oxide?
a.SnO4
b.Sn4O
c.SnO2
d.Sn(OH)4
e.Sn(OH)2
15.The formula of rust is Fe2O3. The correct name of rust is ….
a.iron oxide
b.iron trioxide
c.diiron trioxide
d.iron(II) oxide
e.iron(III) oxide