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Ionic Bonds

Ionic Bonds. August 29, 2012. 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. Homework Quiz.

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Ionic Bonds

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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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