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Unit 6

Unit 6. Covalent Bonding. Lesson1 :Covalent Bonding. Covalent bonds: atoms held together by sharing electrons. Molecules : neutral group of atoms joined together by covalent bonds.

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Unit 6

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  1. Unit 6 Covalent Bonding

  2. Lesson1 :Covalent Bonding • Covalent bonds: atoms held together by sharing electrons. • Molecules: neutral group of atoms joined together by covalent bonds. • Diatomic molecule: molecule consisting of 2 atoms. Remember them: F2, Cl2, I2, Br2, H2, N2, O2 • Molecules tend to have lower melting and boiling points than ionic compounds. • YouTube - Making Molecules with Atoms

  3. Molecular Formula • Shows how many atoms of each element a molecule contains. • Naming binary molecular compounds • Composed of two nonmetals; often combine in more than one way. Ex. CO and CO2 • Prefixes are used to name binary molecular compounds.

  4. Binary Compounds Containing Two Nonmetals To name these compounds: give the name of the less electronegative element first with the Greek prefix indicating the number of atoms of that element present After give the name of the more electronegative non-metal with the Greek prefix indicating the number of atoms of that element present and with its ending replaced by the suffix –ide. Do not use the prefix mono- if required for the first element.

  5. Binary Molecular Compounds N2O dinitrogen monoxide N2O3dinitrogentrioxide N2O5dinitrogenpentoxide ICl iodine monochloride ICl3 iodine trichloride SO2 sulfur dioxide SO3 sulfur trioxide YouTube - Naming molecular compounds

  6. Binary Molecular CompoundsContaining Two Nonmetals As2S3 • ________________ diarsenic trisulfide • ________________ sulfur dioxide • P2O5 ____________________ • ________________ carbon dioxide • N2O5 ____________________ • H2O ____________________ SO2 diphosphorus pentoxide CO2 dinitrogen pentoxide dihydrogen monoxide

  7. Naming Binary Compounds Binary Compound? Yes Metal Present? No Yes Molecule Use Greek Prefixes Does the metal form more than one cation? No Yes Ionic compound (cation has more than one charge) Determine the Charge of the cation; use a Roman numeral after the cation name. Ionic compound (cation has one charge only) Use the element name for the cation. Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 98

  8. Classwork #1:Do handout “Naming Molecules”

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