Dots, Dots, and More Dots Living By Chemistry Unit: Smells Investigation II – Lesson 5
What do you think? <ul><li>Here are the structural formulas for N 2  (nitrogen gas), O 2  (oxygen gas), F 2  (fluorine gas...
What do you think? Single Bond F 2 Double Bond O 2 Triple Bond N 2
Carbon Dioxide CO 2 <ul><li>Begin by drawing the Lewis dot symbols for the carbon and oxygen atoms: </li></ul>
Carbon Dioxide CO 2 <ul><li>Bring the atoms together: </li></ul><ul><li>The octet rule is NOT satisfied! </li></ul><ul><li...
Carbon Dioxide CO 2 <ul><li>Create  double bonds : </li></ul><ul><li>Draw the structural formula </li></ul>
Lewis Dot Structure Strategies <ul><li>Identify the central atom of the molecule and work from there. (Usually one or more...
Lewis Dot Structure Strategies <ul><li>Check to see that all the atoms satisfy the octet rule. (Except for hydrogen atoms!...
 
Check-In <ul><li>We know two things about a certain molecule: </li></ul><ul><ul><li>The molecular formula is C 2 H 4 O 2 <...
Check-In
Wrap-Up <ul><li>Atoms can form double and triple bonds to satisfy the octet rule. </li></ul>
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Dots Dotsand More Dots

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Dots Dotsand More Dots

  1. 1. Dots, Dots, and More Dots Living By Chemistry Unit: Smells Investigation II – Lesson 5
  2. 2. What do you think? <ul><li>Here are the structural formulas for N 2 (nitrogen gas), O 2 (oxygen gas), F 2 (fluorine gas). </li></ul><ul><li>Draw the Lewis dot structures for these three molecules. </li></ul>
  3. 3. What do you think? Single Bond F 2 Double Bond O 2 Triple Bond N 2
  4. 4. Carbon Dioxide CO 2 <ul><li>Begin by drawing the Lewis dot symbols for the carbon and oxygen atoms: </li></ul>
  5. 5. Carbon Dioxide CO 2 <ul><li>Bring the atoms together: </li></ul><ul><li>The octet rule is NOT satisfied! </li></ul><ul><li>How can we satisfy the octet rule??? </li></ul>
  6. 6. Carbon Dioxide CO 2 <ul><li>Create double bonds : </li></ul><ul><li>Draw the structural formula </li></ul>
  7. 7. Lewis Dot Structure Strategies <ul><li>Identify the central atom of the molecule and work from there. (Usually one or more carbon atoms is central – not usually an oxygen atom and never a hydrogen.) </li></ul><ul><li>Determine the number of valence electrons for each atom and draw the Lewis dot symbols. </li></ul><ul><li>Begin to combine atoms with the central atom. </li></ul>
  8. 8. Lewis Dot Structure Strategies <ul><li>Check to see that all the atoms satisfy the octet rule. (Except for hydrogen atoms!) </li></ul><ul><li>Use HONC when you can to check your molecule. </li></ul><ul><li>Count the total number of valence electrons in your molecule. If should match the total number of valence electrons in the individual atoms. </li></ul>
  9. 10. Check-In <ul><li>We know two things about a certain molecule: </li></ul><ul><ul><li>The molecular formula is C 2 H 4 O 2 </li></ul></ul><ul><ul><li>The structure contains on C=O in it </li></ul></ul><ul><li>Using Lewis dot symbols and the octet rule to guide you, draw at least one possible structure for this molecule. </li></ul>
  10. 11. Check-In
  11. 12. Wrap-Up <ul><li>Atoms can form double and triple bonds to satisfy the octet rule. </li></ul>

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