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Ionic Compounds: Non-Binary Compounds or Polyatomic Compounds

Ionic Compounds: Non-Binary Compounds or Polyatomic Compounds. Science 10 Chemistry Unit. Reminders…. Bring your textbook to class everyday this week Make up Quizzes & Probes… Wednesday Lunch Time Review 1/Nomenclature… Due tomorrow Phones Off & Invisible

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Ionic Compounds: Non-Binary Compounds or Polyatomic Compounds

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

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

  3. Ternary Ionic Compounds…Polyatomic Ions • 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. • 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.

  4. Nomenclature • Is very straight forward. • Write the name of the cation…the positive 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”. Example: NH4Cl ammonium chloride (NH4)2CO3 ammonium carbonate

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

  6. Example 1:Write the formula for sodium sulfate Strategy: • Write the ions and their charges • 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. • Write the formula with just the elements and subscripts...no superscripts or charges.

  7. Example 2:Write the formula for calcium phosphate Strategy: • Write the ions and their charges • 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. • Write the formula with just the elements and subscripts...no superscripts or charges.

  8. Example 3:Write the formula for ammonium bicarbonate (or hydrogen carbonate) Strategy: • Write the ions and their charges • 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. • Write the formula with just the elements and subscripts...no superscripts or charges.

  9. Example 4:Write the formula for hydrogen cyanide Strategy: • Write the ions and their charges • 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. • Write the formula with just the elements and subscripts...no superscripts or charges.

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