8th Grade-Ch. 1 Sec. 4 Covalent Bonds
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8th Grade-Ch. 1 Sec. 4 Covalent Bonds

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8th Grade-Ch. 1 Sec. 4 Covalent Bonds Presentation Transcript

  • 1. Ch. 1 Sec. 4 s
  • 2.  
  • 3. covalent bonds
    • usually form between 2 nonmetals
    C 2 H 6
  • 4. molecule
    • neutral group of atoms joined by covalent bonds
  • 5. CH 4 Carbon has 4 electrons in its outer shell. It needs 4 more electrons. Hydrogen needs 1.
  • 6.  
  • 7. Nonpolar bond
    • covalent bond in which valence electrons are shared equally
    • ex: oil
  • 8. Polar bond
            • Covalent bond in which electrons
            • are shared unequally
            • Water molecules are polar
  • 9. Polar bond
  • 10. Polar bond
  • 11. Polar bond Unequal sharing of electrons
  • 12.
    • Unequal sharing of an electron in a polar-covalent bond between 2 atoms is like 2 neighbors buying and sharing one snowblower.
    • But one neighbor has a much
    • longer driveway than the other.
    • After a snowstorm, the snowblower will spend much more of its time at the house with the longer driveway than the other.
    • F, O, Cl have long driveways.
    Be Nice, Clear Your Ice
  • 13. Fluorine forms a nonpolar bond with another fluorine atom. In hydrogen fluoride, fluorine attracts electrons more strongly than hydrogen does, so the bond formed is polar.
  • 14. DOUBLE BOND
    • 2 pairs of electrons are shared
  • 15. TRIPLE BOND
    • 3 pairs of electrons are shared
  • 16.  
  • 17.  
  • 18. molecular compound
    • molecules having covalently bonded atoms
    H 2 O
  • 19. Properties of molecular compounds CH 3 CH 2 OH
  • 20.
    • Lower point
    • & boiling point
  • 21.
    • 2. Poor conductors of electricity
  • 22. Click here for Ionic and Covalent Bonding Quiz
  • 23. YouTube video-Ionic and Covalent Bonding
  • 24. Review Time
  • 25. What holds covalently bonded atoms together?
    • The force that holds atoms together in a covalent bond is the attraction of each atom’s nucleus for the shared pair of electrons .
  • 26. How does unequal sharing of electrons occur, and how does it affect molecules?
    • Atoms of some elements pull more strongly on shared electrons than do atoms of other elements. As a result, the electrons are pulled more toward one atom, causing the bonded atoms to have slight electrical charges .
  • 27. What are the properties of molecular compounds?
    • Molecular compounds generally have lower melting points and boiling points , and they do not conduct electricity when dissolved in water.