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Molecular Compounds
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Molecular Compounds

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  • Transcript

    • 1. CompoundsPart two: Molecular compounds
    • 2. Molecular Compounds • A molecule is a combination of two or more atoms held together by covalent bonds • A covalent bond occurs between the atoms of non- metals in which the two atoms share a pair of electrons
    • 3. Molecular Elements • A molecular element is when two or more atoms of the same element are joined by covalent bonds • A diatomic molecule is a molecule that is made from two atoms e.g.) the element chlorine is a diatomic molecule (Cl2)
    • 4. Molecular Compounds • When atoms of two or more different non-metals combine, a pure substance known as a molecular compound is formed
    • 5. Molecular Compounds • As with molecular elements, the atoms in molecular compounds are joined together by covalent bonds • In each bond, the atoms share a single pair of electrons.
    • 6. Molecular Compounds • For example, water is a molecular compound with two covalent bonds • Each hydrogen atom shares one pair of electrons with an oxygen atom
    • 7. Properties of Molecular Compounds • soft • low melting point • solutions do not conduct electricity
    • 8. Naming Molecular Compounds For compounds that do not contain hydrogen: 1. Name the first element 2. Name the second element and change the ending to “-ide” 3. add prefixes to indicate the number of each atom
    • 9. Naming Molecular Compounds • The prefix “mono” is not used when there is only one atom of the first element • When “mono” is being added to oxygen, the last “o” is dropped (e.g. “monoxide” not “monooxide”)
    • 10. Naming Molecular Compounds Example 1: N2O • Name the first element: nitrogen • Name the second element using “-ide”: oxide • Add prefixes: dinitrogen monixide
    • 11. Naming Molecular Compounds Example 2: PBr3 • Name the first element: phosphorous • Name the second element using “-ide”: bromide • Add prefixes: phosphorous tribromide
    • 12. Naming Molecular Compounds • Hydrogen is unique in many ways, and this is reflected in the naming systems • Many compounds containing hydrogen have been given simpler names • For example, dihydrogen monoxide (H2O) is simply called “water”
    • 13. Naming Molecular Compounds

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