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Let’s Bond

Let’s Bond. Notes on Chemical Bonding. 8/15/13 p. 31 in ILL. Warm-Up. What’s an atom? Draw the atomic structure. What is bonding? What is 3 great things about your track-out?. Announcements. Redos Website: mpatberg.wordpress.com Trays Discipline Tier Warm-Up. Agenda. Warm-Up

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Let’s Bond

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  1. Let’s Bond Notes on Chemical Bonding 8/15/13 p. 31 in ILL

  2. Warm-Up • What’s an atom? • Draw the atomic structure. • What is bonding? • What is 3 great things about your track-out?

  3. Announcements • Redos • Website: mpatberg.wordpress.com • Trays • Discipline Tier • Warm-Up

  4. Agenda • Warm-Up • Notes/Videos • Essential Learning

  5. Quick Review: • What’s an atom? • Smallest unit of matter • Made of protons (+), electrons (-), and neutrons • Has a nucleus and energy shells • Outermost energy shell is called a valence shell

  6. Valence Shells: • Determine how an atom behaves when it encounters other atoms • reactivity • Determined by group number in periodic table • Desired number of valence electrons is 8 (octet rule)

  7. Chemical Bonding: • Just like the 26 letters of alphabet combine to form words, the 100+ elements combine to form compounds (2 or more different elements) • http://www.brainpop.com/science/matterandchemistry/chemicalbonds/

  8. Chemical Bonding: • an attempt to fill valence shells to “feel noble” • Two types— • Ionic bonds • Covalent bonds

  9. Lewis Dot Diagrams: A quick simple way to show valence electrons 1 2 13 14 15 16 17 18 H He:      LiBe B  C  N  O : F :Ne :            Na Mg AlSiPS:Cl :Ar:    

  10. Learning Check: A. X would be the electron dot formula for 1) Na 2) K3) Al   B.  X  would be the electron dot formula  1) B 2) N 3) P

  11. Review Ions: Sodium atom Sodium ion Na  – e Na +(feels like Ne) 11 p+ 11 p+ 11 e- 10 e- 01+

  12. Review Ions: Fluorine atom Fluorine ion :F: + e:F:-(feels like Ne) 9 p+ 9 p+ 9 e- 10 e- 01-

  13. Ionic Bonds: • Ions are the result of atoms gaining or losing electrons • An ionicbond forms when one atom transfers an electron to another atom • Occurs when a metal reacts with a non-metal • The number of electrons lost must be equal to the number of electrons gained

  14. Ionic Bonds cont… • Great conductors of electricity when dissolved in water • Have very high melting points • Metals will lose electrons, non-metals will gain electrons • Held together by strong attraction of (+) to (-)

  15. Learning Check: A. Number of valence electrons in aluminum 1) 1 e-2) 2 e-3) 3 e- B. Change in electrons for octet (8 valence) 1) lose 3 e- 2) gain 3 e- 3) gain 5 e- C. Ionic charge of aluminum 1) 3- 2) 5- 3) 3+

  16. Covalent Bonds: • A bond formed when electrons are shared between two atoms • Occurs between non-metallic atoms • Not good conductors of electricity

  17. Covalent Bonds cont… • Low melting points • Mostly liquids and gases at room temp (solids are like plastics) • Individual groups of like atoms formed by covalent bonds are called molecules

  18. Learning Check: A. Covalent bonds are formed when atoms __________ electrons. 1) give up2) take on3) share B. Oxygen would most likely form a covalent bond with 1) Na 2) N 3) Ca

  19. Comparison of Bonds covalent ionic molecules ions conductive Non-conductive valence electrons Transfers electrons Sharing electrons metals/non-metals non-metals only solids/crystals liquids/gases low mp high mp

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