Ionic Compounds: Non- Binary Compounds or Polyatomic Compounds Science 10 Chemistry Unit

Reminders… Bring your textbook to class everyday this week Bring your textbook to class everyday this week Make up Quizzes & Probes… Wednesday Lunch Time Make up Quizzes & Probes… Wednesday Lunch Time Review 1/Nomenclature… Due tomorrow Review 1/Nomenclature… Due tomorrow Phones Off & Invisible Phones Off & Invisible In-Class Assignments (1 & 2)…Place in Basket In-Class Assignments (1 & 2)…Place in Basket Thursday’s (Library) Research Project…Basket Thursday’s (Library) Research Project…Basket

Ternary Ionic Compounds…Polyatomic Ions Can be found on the back of your “ coloured ” periodic table. Can be found on the back of your “ coloured ” periodic table. Polyatomic ions are ions that have more than one element…” poly ” means more than one or many. Polyatomic ions are ions that have more than one element…” poly ” means more than one or many. As you can see, the charges of the polyatomic ions vary from positive to negative values (cations and anions). As you can see, the charges of the polyatomic ions vary from positive to negative values (cations and anions). You can usually tell that you have a polyatomic ion from the “ending” an “ ate ”, “ ite ”, “ ium ”, and “ ide ” ending as in cyanide and hydrogen sulphide. You can usually tell that you have a polyatomic ion from the “ending” an “ ate ”, “ ite ”, “ ium ”, and “ ide ” ending as in cyanide and hydrogen sulphide.

Nomenclature Is very straight forward. Is very straight forward. Write the name of the cation…the positive ion as is. Write the name of the cation…the positive ion as is. Write the name of the anion…the negative polyatomic ion as is. Write the name of the anion…the negative polyatomic ion as is. If the anion is a non-metal, make sure the ending is “-ide”. If the anion is a non-metal, make sure the ending is “-ide”. : Example : NH 4 Cl ammonium chlor ide (NH 4 ) 2 CO 3 ammonium carbon ate

Compound Formula Compound Name BaCO 3 Sr(C 2 H 3 O 2 ) 2 NaOH NH 4 Cl Fe(NO 3 ) 3 CdSO 4 Ca 3 (PO 4 ) 2 Ag 2 CO 3 KC 2 H 3 O 2 (same as CH 3 COO - ) Fe(OH) 2

Formulae Writing Is a little more complicated Is a little more complicated We just follow the strategy we have been using until now. We just follow the strategy we have been using until now. The overall charge for an ionic compound must always equal zero ! The overall charge for an ionic compound must always equal zero !

Strategy : Write the ions and their charges Write the ions and their charges Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Remember to keep the elements of the polyatomic ion together, use brackets around them. Remember to keep the elements of the polyatomic ion together, use brackets around them. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula for sodium sulfate Example 1: Write the formula for sodium sulfate

Strategy : Write the ions and their charges Write the ions and their charges Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Remember to keep the elements of the polyatomic ion together, use brackets around them. Remember to keep the elements of the polyatomic ion together, use brackets around them. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula for calcium phosphate Example 2: Write the formula for calcium phosphate

Strategy : Write the ions and their charges Write the ions and their charges Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Remember to keep the elements of the polyatomic ion together, use brackets around them. Remember to keep the elements of the polyatomic ion together, use brackets around them. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula for ammonium bicarbonate (or hydrogen carbonate) Example 3: Write the formula for ammonium bicarbonate (or hydrogen carbonate)

Strategy : Write the ions and their charges Write the ions and their charges Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Ask yourself, is the overall charge equal to zero? If not make it so...use the crossover method. Remember to keep the elements of the polyatomic ion together, use brackets around them. Remember to keep the elements of the polyatomic ion together, use brackets around them. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula with just the elements and subscripts...no superscripts or charges. Write the formula for hydrogen cyanide Example 4: Write the formula for hydrogen cyanide

Name of Compound Element or Polyatomic Cation Element or Polyatomic Anion Compound Formula Aluminum Carbonate Aluminum Acetate Aluminum Hydroxide

Name of Compound Element or Polyatomic Cation Element or Polyatomic Anion Compound Formula Ammonium Fluoride Beryllium Nitrate Magnesium Sulfate Calcium Phosphate Strontium Carbonate Barium Acetate Magnesium Hydroxide Ammonium Sulfide Aluminum Nitrate Aluminum Phosphate