7th Grade-Ch. 1 Sec. 4 Covalent Bonds
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7th Grade-Ch. 1 Sec. 4 Covalent Bonds

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    7th Grade-Ch. 1 Sec. 4 Covalent Bonds 7th Grade-Ch. 1 Sec. 4 Covalent Bonds Presentation Transcript

    • Ch. 1 Sec. 4 s
    •  
    • covalent bonds
      • usually form between 2 nonmetals
      C 2 H 6
    • molecule
      • neutral group of atoms joined by covalent bonds
    • CH 4 Carbon has 4 electrons in its outer shell. It needs 4 more electrons. Hydrogen needs 1.
    •  
    • Nonpolar bond
      • covalent bond in which valence electrons are shared equally
      • ex: oil
    • Polar bond
              • Covalent bond in which electrons
              • are shared unequally
              • Water molecules are polar
    • Polar bond
    • Polar bond
    • Polar bond Unequal sharing of electrons
      • 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
    • 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.
    • DOUBLE BOND
      • 2 pairs of electrons are shared
    • TRIPLE BOND
      • 3 pairs of electrons are shared
    •  
    •  
    • molecular compound
      • molecules having covalently bonded atoms
      H 2 O
    • Properties of molecular compounds CH 3 CH 2 OH
      • Lower point
      • & boiling point
      • 2. Poor conductors of electricity
    • Click here for Ionic and Covalent Bonding Quiz
    • YouTube video-Ionic and Covalent Bonding
    • Review Time
    • 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 .
    • 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 .
    • 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.