Chemical Nomenclature and Formulas: What’s in a Name?

LOL

ASAP

FYI

BRB

Binary Compounds—Writing Chemical

formulas

1) Cation, Anion

2) Write oxidation number/charge on each element.

3) Balance charges by the smallest common multiplier between the two elements. Charges must add to 0 for a neutral compound.

4) Add the subscripts for each element in the chemical compound.

Example 1: Magnesium bromide

Example 2: Aluminum oxide

5) If the first element is a transition element, the oxidation number or charge of the element is given by a Roman numeral (I, II, III, IV, etc.) following the element name. Exceptions: Ag+1 and Zn+2—they will always have these charges.

Example 3: Tin (IV) sulfide

Example 2: Mercury (II) fluoride

Example 4: Iron (III) oxide

Try…..1)Calcium chloride

2)Copper (I) oxide

3)Sodium bromide

4)Potassium sulfide

5)Calcium oxide

Binary Compounds—Writing Chemical formulas (Cont.)

6) If a binary compound has a prefix or prefixes in front of an element name, these prefixes are the subscripts for that element in the chemical formula. Prefixes represent the number of element atoms present in a molecule of the chemical compound.

Prefixes

1 mono 6 hexa

2 di 7 hepta

3 tri 8 octa

4 tetra 9 nona

5 penta 10 deca

Example 1: Carbon tetrachloride

Example 2: Diphosphorus

trioxide

Polyatomic Chemical Compounds—Writing Chemical Formulas.

1) Cation, Anion—reference table

2) Write the oxidation number/charge on each element and polyatomic ion.

3) Balance charges by the smallest common multiplier between the cation and anion. Charges must add to 0 for a neutral compound.

4) Add the subscripts for each element/polyatomic ion to the chemical compound.

*Polyatomic ions: place polyatomic ions in parentheses when adding subscript (ex. (NO3)2)

Example 1: Silver nitrate

Example 2: Magnesium acetate

Example 3: Calcium carbonate

Example 4: Ammonium chloride

Can we go in

reverse?

Binary Compounds: Chemical

Nomenclature1) Write an element’s oxidation number over the element symbol.

2) Cation, Anion—write the element name

3) Add the ending -IDE to the second element/anion

Example 1: Al2S3

Example 2: CaBr2

Transition Elements

4) Place a Roman numeral matching the charge/oxidation # on an element after the positive element’s name. Roman numeral is put in () (ex. (II)). Roman numeral indicates the oxidation number on an element can vary.

-Go back to Step #3

Example 1: CuS

Example 2: CoBr2

5) If both elements are found on the RIGHT side of the periodic table, use the appropriate prefix for a given element.

-Go back to Step #3

Example 1: SBr3

Example 2: CCl4

Compounds with Polyatomic Ions:

Chemical Nomenclature

1) Write oxidation # for each element/polyatomic ion in the formula

2) Write the element and/or polyatomic ion names.

3) If a transition element (an element where the oxidation # varies), use a Roman numeral to indicate an element’s oxidation # in the chemical name.

*NO –IDE ENDING!!!!

Example 1: Sr(NO3)2

Example 2: CuSO4

Homework 9/25

Inorganic Nomenclature worksheet

Read over lab procedure for Thursday

Liquid Chromatography Lab due Thursday

Study for Element/Polyatomic quiz next Tuesday, October 3rd