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Chemical Bonding and Periodic Trends

This assignment covers the concepts of chemical bonding, electron configurations, ionization energy, electronegativity, and Lewis structures. It includes a quiz and reading Chapter 8 with suggested homework.

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Chemical Bonding and Periodic Trends

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  1. To Do • 7th Lon-Capa assignment due Friday, April 8th by 10 pm. • Quiz #5 on Wednesday, April 13 in Discussion. • Continue reading Chapter 8 and doing the suggested homework.

  2. Elements/Ions Do Not “Want” To Lose Electrons!

  3. Electron Affinity

  4. Elements/Ions Do Not “Want” To Lose Electrons!

  5. A Covalent Bond

  6. Clicker Question Imagine the bond formed in the carbon monoxide molecule (C-O). Which atom would you expect to have a greater attraction for the electrons in the bond? a) carbon b) oxygen c) They have the same attraction (both have n=2 as highest energy level with an electron). d) I do not know.

  7. Electronegativity

  8. Bond Types

  9. Bond Types

  10. A Polar Bond

  11. Clicker Question Rank the following bonds from least polar to most polar: Si-Cl P-Cl Mg-Cl S-Cl A) S-Cl, P-Cl, Mg-Cl, Si-Cl B) P-Cl, S-Cl, Si-Cl, Mg-Cl C) Mg-Cl, Si-Cl, P-Cl, S-Cl D) Mg-Cl, S-Cl, P-Cl, Si-Cl E) S-Cl, P-Cl, Si-Cl, Mg-Cl

  12. From the Periodic Table… • Electron configurations • Charges for ions in compounds (and thus formulas for compounds) • Trends • Atomic radius • Ionization energy • Electronegativity • Polarity of Bonds

  13. Former Clicker Question The following chemical reaction releases heat: A2 + B2 2AB. This means: more stable higher average bond energies a) Reactants Reactants b) Reactants Products c) Products Products d) Products Reactants e) I do not know.

  14. Lewis Structures • Determine the total number of valence electrons in the molecule. • Form at least one bond between atoms in the molecule (a pair of electrons is a bond) • Arrange the rest of the electrons (in pairs) to satisfy the octet rule or duet rule (for hydrogen). • Watch for exceptions.

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