8th Grade Ch 1 Sec 4 Covalent Bonds


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8th Grade Ch 1 Sec 4 Covalent Bonds

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