7th Grade Ch 1 Sec 3 Ionic Bonds

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7th Grade Ch 1 Sec 3 Ionic Bonds

  1. 1. Ch. 1 Sec. 3
  2. 3. ion <ul><li>atom or group of atoms that has an electric charge </li></ul>
  3. 4. <ul><li>Much like people, most atoms don't like to live solitary existences. </li></ul><ul><li>They need to COME TOGETHER with other atoms to lead more stable, happier lives.  </li></ul><ul><li>This process of coming together is called chemical bonding. </li></ul>
  4. 8. ionic bond <ul><li>forms a neutral ionic compound </li></ul><ul><li>the 2 atoms then become oppositely charged ions & feel a strong electric attraction for each other </li></ul><ul><li>formed between 2 atoms of a molecule when 1 atom transfers valence electrons to the other </li></ul>
  5. 11. Ionic bonding: In the playground at recess, a 3 rd grader has a chocolate bar. A 7 th grader takes the chocolate bar from the 3 rd grader and the 3 rd grader follows the 7 th grader around for the rest of the recess, trying to get some of it back. This is like a BIG Cl atom taking a little Li’s electron to make LiCl.
  6. 13. The animation shows the process that takes place during the formation of an ionic bond. http://www.wisc-online.com/objects/index_tj.asp?objid=GCH2204
  7. 15. One electron is transferred from the sodium atom to the chlorine atom.
  8. 16. After losing an electron, the sodium atom becomes a sodium ion with a 1+ charge. After gaining an electron, the chlorine becomes a chloride ion with a 1- charge.
  9. 17. [02:18]
  10. 18. 1+ 3+ 2+ 4+ or 4- 3- 2- 1-
  11. 19. polyatomic ions <ul><li>ions that are made of more than 1 atom </li></ul>
  12. 20. Naming ionic compounds <ul><li>Name of positive ion (usually a metal) </li></ul><ul><li>Name of negative ion </li></ul><ul><ul><li>if negative ion is an element- end of its name changes to – ide </li></ul></ul><ul><ul><li>if negative ion is polyatomic- name remains unchanged </li></ul></ul><ul><ul><li>example : </li></ul></ul>Sodium Bicarbonate NaHCO 3
  13. 21. Characteristic properties of ionic compounds: <ul><li>crystal shape </li></ul>
  14. 22. [00:54]
  15. 23. 2. h igh melting point
  16. 24. 3. electrical conductivity
  17. 25. Bonding Basics- Ionic Bonds <ul><li>Complete each ionic bond by using Froot Loops. Use markers or crayons to draw the bonds. </li></ul><ul><li>Potassium + Fluorine </li></ul><ul><li>Magnesium + Iodine </li></ul><ul><li>Sodium + Oxygen </li></ul><ul><li>Sodium + Chlorine </li></ul><ul><li>Calcium + Chlorine </li></ul>
  18. 26. Let's Review
  19. 28. Characteristic properties of ionic compounds: <ul><li>crystal shape </li></ul>2. high melting point 3. electrical conductivity
  20. 29. polyatomic ions <ul><li>ions that are made of more than 1 atom </li></ul>
  21. 30. How are ionic compounds named? <ul><li>Name of positive ion (usually a metal) </li></ul><ul><li>Name of negative ion </li></ul><ul><ul><li>if negative ion is an element- end of its name changes to – ide </li></ul></ul><ul><ul><li>if negative ion is polyatomic- name remains unchanged </li></ul></ul><ul><ul><li>example : </li></ul></ul>sodium chloride NaCl sodium bicarbonate NaHCO 3
  22. 31. YouTube video-Based on song from Grease

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