lecture 2 - Demonstrations Lecture 2 EIGHT IS ENOUGH:...

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1 Lecture 2 EIGHT IS ENOUGH: Chemical Bonds Key Idea: Bonding tendencies depend on the number of valence electrons. Demonstrations 2 Na (s) + Cl 2 (g) 2 H 2 (g) + O 2 (g) (g) Combine pairs of elements Where are the elements on the periodic table? What do you expect will happen? This is a hugely powerful reaction ! 2 H 2 H 2 (g) + O (g) 2 (g) 2 H 2 H 2 O (l) Demonstrations 2 Na (s) + Cl 2 Na (s) + Cl 2 (g) 2 (g) 2 NaCl NaCl (s) (s) 2 H 2 H 2 (g) + O (g) + O 2 (g) 2 H (g) 2 H 2 O (l) O (l) Only certain stoichiometries are observed: Other compounds with hydrogen: CH 4 NH 3 H 2 O HF Ne SiH 4 PH 3 H 2 S HCl Ar Other metal chlorides: NaCl MgCl 2 AlCl 3 KCl CaCl 2 GaCl 3 What patterns do you see in the bonding of C, H, O, and N? HONC 1234 C H H C H H C H H C H H H H N H C CCC H H C C H H H H H H H H H O OH Bonding Patterns C C C C C C C C C O C H H H H H H H H H H H H H H H H H H What are the lines in structural formulas? What do the dots represent? CH H H H C H H H H C H H H H Electron Pair Bonds Notice that one electron comes from each atom in a pair to make an electron pair bond.
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lecture 2 - Demonstrations Lecture 2 EIGHT IS ENOUGH:...

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