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Mastering Ionic Compound Formulas: Writing Practice & Types

Learn to write ionic compound formulas efficiently using the "Switch, Drop, and Reduce" method. Practice predicting neutral formulas and identify three types of ionic compounds. Get ready for a comprehensive understanding of ion formations.

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Mastering Ionic Compound Formulas: Writing Practice & Types

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  1. Chemistry – Jan 12, 2018 • P3 Challenge- • ACT Friday (#1-11) • Objective – • Ionic compound formation • Assignment: Start Ionic Compounds Worksheet • Agenda • ACT Friday • IMF Homework review • Writing ionic formulas

  2. Writing Ionic Formulas – SHORT CUT • Because compounds are electrically neutral, one can determine the formula of a compound this way: • The charge on the cation becomes the subscript on the anion. • The charge on the anion becomes the subscript on the cation. • If these subscripts are not in the lowest whole-number ratio, divide them by the greatest common factor. • “Switch, Drop and Reduce”

  3. Writing Ionic Formulas Practice • Predict ionic compounds that form using the exponent switch drop and reduce process to create a neutral formula. • Formula always written with cation (metal) first • Ex: compound formed by barium and chlorine • Ex: compound formed by aluminum and oxygen

  4. Writing Ionic Formulas Practice (cont) • Ex: compound formed by sulfur and sodium • Ex: compound formed by Fe+2 and oxygen • Ex: compound formed by barium and hydroxide • Use parentheses anytime you need more than one of a polyatomic ion

  5. Three types of ionic compounds • Type 1 - Binary compound (contains only two elements) and cation charge is known because atom can form only one type of ion. • Metal forms only one type of ion: Groups 1A, 2A, Al3+, Ga3+, Zn2+, Cd2+, and Ag+ • Type 2 – Binary compound with variable charge cations. • Transition metals and representative metals. • Type 3 – Polyatomic ion compound contains three or more elements contained within one or two polyatomic ions.

  6. Exit Slip - Homework • Exit Slip: • Write the formula for the compound that forms between calcium and nitrite. • What’s Due? (Pending assignments to complete.) • Ionic Compounds Worksheet, First table only • What’s Next? (How to prepare for the next day) • Read Holt p159-175

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