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Bonding: Remember Always!!

Bonding: Remember Always!!. Forming a Bond: • Releases Energy • Is exothermic • H is negative (-). Breaking a Bond: • Requires Energy • Is endothermic • H is positive (+). Coulomb’s Law. This is given to us in the form of an equation:.

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Bonding: Remember Always!!

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  1. Bonding: Remember Always!! Forming a Bond: • Releases Energy • Is exothermic • H is negative (-) Breaking a Bond: • Requires Energy • Is endothermic • H is positive (+)

  2. Coulomb’s Law This is given to us in the form of an equation: But we’ll NEVER be asked to calculate a numeric answer using it! So what’s its purpose?

  3. Coulomb’s Law • We can predict melting points using these principles • We can predict “bond strength” using these principles The greater the value of Eion pair , the higher the MP, the stronger the bond.

  4. Coulomb’s Law • (n+e) and (n–e) are the charges of the ions involved. For CaO, the numerator is 4x that as for NaCl (2x2 vs. 1x1) • d is the “bond distance”, which is related to ion size. We need to know our trends! Smaller ions means greater Eion poir .

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