7th Grade-Ch. 1 Sec. 3 Ionic Bonds
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7th Grade-Ch. 1 Sec. 3 Ionic Bonds

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7th Grade-Ch. 1 Sec. 3 Ionic Bonds 7th Grade-Ch. 1 Sec. 3 Ionic Bonds Presentation Transcript

  • Ch. 1 Sec. 3
  • ion
    • atom or group of atoms that has an electric charge
  •  
    • Much like people, most atoms don't like to live solitary existences.
    • They need to COME TOGETHER with other atoms to lead more stable, happier lives. 
    • This process of coming together is called chemical bonding.
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  •  
  • ionic bond
    • forms a neutral ionic compound
    • the 2 atoms then become oppositely charged ions & feel a strong electric attraction for each other
    • formed between 2 atoms of a molecule when 1 atom transfers valence electrons to the other
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  • 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.
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  • 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
  • Youtube video-Halogens
  • One electron is transferred from the sodium atom to the chlorine atom.
  • 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.
  • [02:18]
  • 1+ 3+ 2+ 4+ or 4- 3- 2- 1-
  • polyatomic ions
    • ions that are made of more than 1 atom
  • Naming ionic compounds
    • Name of positive ion (usually a metal)
    • Name of negative ion
      • if negative ion is an element- end of its name changes to – ide
      • if negative ion is polyatomic- name remains unchanged
      • example :
    Sodium Bicarbonate NaHCO 3
  • Characteristic properties of ionic compounds:
    • crystal shape
  • [00:54]
  • 2. h igh melting point
  • 3. electrical conductivity
  • Bonding Basics- Ionic Bonds
    • Complete each ionic bond by using Froot Loops. Use markers or crayons to draw the bonds.
    • Potassium + Fluorine
    • Magnesium + Iodine
    • Sodium + Oxygen
    • Sodium + Chlorine
    • Calcium + Chlorine
  • Let's Review
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  • Characteristic properties of ionic compounds:
    • crystal shape
    2. high melting point 3. electrical conductivity
  • polyatomic ions
    • ions that are made of more than 1 atom
  • How are ionic compounds named?
    • Name of positive ion (usually a metal)
    • Name of negative ion
      • if negative ion is an element- end of its name changes to – ide
      • if negative ion is polyatomic- name remains unchanged
      • example :
    sodium chloride NaCl sodium bicarbonate NaHCO 3
  • YouTube video-Based on song from Grease