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3.5- Understanding Chemical Compounds

3.5- Understanding Chemical Compounds. Ionic Compounds. Ionic compounds involve the transfer of electons Ex) K + Cl K + ( Cl ) - Because it creates filled energy levels, the stability of the structure is similar to noble gases. Properties and model of ionic compounds.

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3.5- Understanding Chemical Compounds

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  1. 3.5- Understanding Chemical Compounds

  2. Ionic Compounds • Ionic compounds involve the transfer of electons • Ex) K + Cl K+ ( Cl )- • Because it creates filled energy levels, the stability of the structure is similar to noble gases.

  3. Properties and model of ionic compounds • solid at SATP (23o C) so must be strongly bonded together • High melting and boiling points • Good conductors of electricity when in solution form. • Ions are arranged to be surrounded by opposite charges. The arrangement of the ions is called a crystal lattice. • This arrangement explains why they are brittle, once the order of the ions is changed the crystal lattice will fall apart

  4. Metallic crystals • Range from soft to very hard • Ductile, malleable, lustrous • Conducts electricity • Very compact crystalline structure ( some exceptions) • Valance electrons pass around from one ion to the next, ”gluing” the atoms together

  5. Molecular crystals • Low melting points • Non-conductors of electricity • Soft

  6. Covalent network crystals • Among the hardest materials on Earth ex) diamonds • Very hard, brittle, insoluable, nonconductors of electricity, high melting points • Like ionic bonds, have a continuous bonding holding the crystal together • Usually involve carbon or silicon

  7. Carbon • Carbon is a very exceptional element as it can bond to itself to form many different pure carbon substances. See page 127 for carbon models

  8. Read and take notes of pages 119 to 129 • Do practice problems • Do questions on pg 129-130

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