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Molecular Compounds

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Molecular Compounds Chapter 8.1 and 9.3 Basic understanding of covalent compounds and their properties Understand basics of a molecular formula How to name covalent ... – PowerPoint PPT presentation

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Title: Molecular Compounds


1
Molecular Compounds
  • Chapter 8.1 and 9.3

2
Learning Objectives
  • Basic understanding of covalent compounds and
    their properties
  • Understand basics of a molecular formula
  • How to name covalent compounds

3
Molecular Compounds
  • Compounds made from nonmetals are called
    molecular or covalent compounds
  • Occurs when two or more elements share electrons
    to achieve stable octets
  • Held together by covalent bonds (we will talk
    about this next lecture)

4
Molecular Compounds
  • Properties of molecular compounds
  • Low melting and boiling points
  • Exist as gases or liquids at RT
  • Made of nonmetals
  • Neutral compounds can gain a unit charge to
    become polyatomic ions

5
Molecular Formula
  • Molecular compounds are written as molecular
    formulas
  • Examples
  • CO2 means 1 atom of C and 2 atoms of O
  • H2O means 2 atoms of H and 1 atom of O

6
Naming Molecular Compounds
  • First element is named using standard name
  • Second element prefixes are used to denote the
    number of atoms present
  • named with an ide ending
  • But dont use mono on the first element
  • Mono 1 Di 2 Tri 3 Tetra 4 Penta 5
  • Hexa 6 Hepta 7 Octa 8 Nona 9 Deca 10

7
Homework
  • Read Chapters 8.1,8.2, and 9.3.
  • 8.1
  • Page 216 1-4
  • Page 247 39-41
  • 9.3
  • Page 270 22-25
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