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Understanding Ionic Bonds: Concepts and Activities

This lesson on ionic bonds covers the fundamental concepts of ionic compounds, including the formation of cations and anions through electron transfer. Students will engage in interactive activities, such as quizzes and worksheets, to deepen their understanding of the octet rule and crystal lattice structures formed by ionic compounds. They will explore real-life applications of ionic bonds in technology while collaborating with peers to reinforce their knowledge through drawing Lewis Dot structures and forming ionic compound formulas.

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Understanding Ionic Bonds: Concepts and Activities

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  1. Ionic Bonds August 29, 2012

  2. Catalyst • Take out your homework packet so I can stamp it. • Answer the following questions in the Catalyst section of your Daily Work Organizer: • Think of a time you gave something away. What was it and why did you give it away? • Thi

  3. Homework Quiz • Answer the Following Questions on a half sheet of paper. • What is an anion? • What is a cation? • What ion will Selenium (Se – atomic # 34) form? How do you know?

  4. Homework Quiz: Answers • What is an anion? It is an ion with a negative charge. • What is a cation? It is an ion with a positive charge. • What ion will Selenium (Se – atomic # 34) form? How do you know? Se2- because Se is group 16 which has 6 valence electrons. It needs two more electrons to have a full outer shell. If it gains two electrons it will have a 2- charge.

  5. Objectives • I can explain how electrons are transferred in an ionic bond. • I can explain that ionic compounds form crystals. • I can use the octet rule to predict how ionic bonds will form.

  6. Agenda • Catalyst • Guided Notes & WS: Ionic Bonds • Exit Slip = Complete Worksheet • If you finish early: Articles on ions in technology

  7. Ionic Bonds: What is an ionic compound? • An ionic compound is made up of a metal and a non-metal. Lithium + Hydrogen Aluminum + Oxygen Sodium + Chlorine

  8. What is an ionic bond? • An ionic bond forms when electrons are transferred from a metal to a non-metal. • Metals lose electrons to produce positive ions. • Na → Na+ + e− • Li → Li++ e− • Al→ Al3+ + 3e− • Non metals gain electrons producing negative ions. • Cl + e− → Cl− • H+ e− → H− • O+ 2e− → O2-

  9. Ionic Compounds Form a Crystal Lattice Structure • An ionic bond is the electrostatic attraction between two oppositely charged ions. • Na+ + Cl− → NaCl • Li++ H−→ LiH • Al3++ O2-→ Al2O3

  10. crystal lattice structure • Metal and non-metal ions combine with one another to produce an orderly arrangement of ions called a crystal lattice.The crystal has an overall neutral charge.

  11. Ions form compounds in a set ratio • For example: • NaClis made up of sodium, Na+ and chloride, Cl- ions in the ratio of one to one or Na+: Cl- = 1:1 • CaF2 is made up of calcium, Ca2+ and Fluoride F- ions in the ratio of one to two or Ca2+:2F- = 1:2

  12. Agenda • Catalyst • Guided Notes & WS: Ionic Bonds • Exit Slip = Complete Worksheet • If you finish early: Articles on ions in technology

  13. Worksheet: Ionic Bonds • Work with the person next to you. • The complete worksheet is your exit slip. • Draw the Lewis Dot Structure for each element. • Determine how many electrons each element must lose or gain to meet the octet rule. • Draw arrows showing the transfer of electrons from metal cation to non-metal anion. • Write ionic compound formula. • Name the compound.

  14. Find Your Ionic Bond! • Instructions: • You will get a card with an element symbol and the number of electrons the element must lose or gain to form a full valence shell (to meet the octet rule). • Your task is to find an ionic bond match in the class. • Example: If my card says “Ra - lose 2”, I would look for someone in class whose card says “gain 2”. • Once you find your match, come show Ms. Boon your cards. • HERE’S THE CATCH! THIS IS A SILENT ACTIVITY – FIND YOUR MATCH BY SHOWING YOUR CARD ONLY.

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