Making and Naming Compounds Chemical formulation 2 Names ---- Formulas

Objectives Identify the charges of some common ions Calculate the formula from the name of a compound

What are the names of these compounds? Sodium fluoride Boron oxide Beryllium chloride Caesium sulphide Potassium phosphide NaF B2O3 BeCl2 Cs2S K3P

WITHOUT USING A PERIODIC TABLE Put the elements into their groups There are 2 elements from each group (not counting the transition metals) What is the oxidation number for each atom?

Names to Formulae Write the formula for Potassium sulfide. Identify the elements symbols K S Find the ions (happy atoms /oxidation numbers) K+ S2- Balance the charges K+ K+ S2- Simplify by putting numbers at the bottom Don’t write the number 1 K2S (if necessary) reduce numbers to their lowest ratio

What are the names of these compounds? Sodium fluoride Boron oxide Beryllium chloride Caesium sulphide Potassium phosphide NaF B2O3 BeCl2 Cs2S K3P

Put these elements into groups based on their oxidation numbers Boron Chlorine Nitrogen Lithium Aluminium Sulfur Magnesium Oxygen Sodium Calcium Beryllium Carbon Zinc Potassium Silver

Put these elements into groups based on their oxidation numbers Lithium, sodium and potassium (+1) Oxygen, Sulfur (-2) Chlorine (-1) Beryllium, magnesium and calcium (+2) Zinc, Silver (transition metals) Boron and aluminium (+3) Carbon (+4 /-4) Nitrogen (-3)

Names to Formulae BeCl2 CaO K3P Mg3N2 Beryllium chloride Calcium oxide Potassium phosphide Magnesium nitride Identify the elements symbols Find the ions (oxidation numbers) Balance the charges Simplify by putting numbers at the bottom (if necessary) reduce numbers to their lowest ratio Don’t write the number 1

Write the names and formulas LiF  CaH2 magnesium nitride beryllium chloride Lithium flouride  Calcium hydride Mg3N2 BeCl2

Type I Binary Compounds Type 2 Binary Compounds

Type II Binary Compounds For Type II binary compounds the metal present is NOT found in either Group 1 or Group 2 on the periodic table. These make cations that can have various oxidation numbers. We label their oxidation number by using Roman Numerals 1......... I                 6......... VI 2......... II                7......... VII 3......... III              8......... VIII 4......... IV              9......... IX 5......... V               10....... X e.g. Iron (II) chloride Iron cation has a charge of 2+

Names to Formulae FeCl2 PbS2 Ni2O3 Iron (II) chloride Lead (IV) sulphide Nickel (III) oxide Identify the elements symbols Find the ions (oxidation numbers) Balance the charges Simplify by putting numbers at the bottom (if necessary) reduce numbers to their lowest ratio Don’t write the number 1

Type II Binary Compounds For Type II binary compounds the naming is more difficult because you need to include the oxidation number in roman numerals. Write the name of Fe2O3 Identify the elements and symbols Fe (iron) O (oxygen) Find the ions (oxidation numbers) Fe? O2- Balance the charges to get the oxidation number Fe? Fe? = O2- O2- O2- Write the cation oxidation number in roman numerals (III) Write the names with the number in the middle Iron (III) oxide

Type II Binary Compounds Write the names of FeO CuCl CrO3 Pb3N4 Identify the elements and symbols Find the ions (oxidation numbers) Balance the charges to get the oxidation number Write the cation oxidation number in roman numerals Write the names with the number in the middle

Type II Binary Compounds Write the names of FeO CuCl CrO3 Pb3N4 Identify the elements and symbols Find the ions (oxidation numbers) Balance the charges to get the oxidation number Write the cation oxidation number in roman numerals Write the names with the number in the middle Iron (II) oxide Copper (I) chloride Chromium (VI) oxide Lead (IV) nitride

Practice of type 1 and 2 K2O H2S Na3P Sodium oxide Calcium hydride Beryllium nitride Titanium(IV) oxide Iron(III) sulphide Cobalt(II) flouride Co2S3 Hg3P2 CdI2 Potassium oxide Hydrogen sulphide Sodium phosphide Na2O CaH2 Be3N2 TiO2 Fe2S3 CoF2 Cobalt (III) sulfide  Mercury (II) phosphide Cadmium (II) iodide  

Practice of type 1 and 2 K2O H2S Na3P Sodium oxide Calcium hydride Beryllium nitride Titanium(IV) oxide Iron(III) sulphide Cobalt(II) flouride Co2S3 Hg3P2 CdI2 Potassium oxide Hydrogen sulphide Sodium phosphide Na2O CaH2 Be3N2 TiO2 Fe2S3 CoF2 Cobalt (III) sulfide  Mercury (II) phosphide Cadmium (II) iodide  

Type 3 Compounds are the same as Type 2 Binary compounds Write the formula for carbon(IV) chloride. C Cl C4+ Cl- C4+ 4 x Cl- = CCl4 Name the compound N2O Nitrogen (?) oxide N? O2- N? N? O2- : N+ = Nitrogen (I) oxide