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7th Grade Chapter 4 Lesson 4
 

7th Grade Chapter 4 Lesson 4

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    7th Grade Chapter 4 Lesson 4 7th Grade Chapter 4 Lesson 4 Presentation Transcript

    • Pg. 141-144 For Student Use Only
    • Chemistry is the study of the composition, structure, and properties of matter and the changes matter undergoes.
    • Mixtures and Compounds
      • Salt and Pepper mix but still taste different and look different.
    • Mixtures and Compounds
      • Hydrogen and Oxygen make water.
      • Sodium and Chlorine make table salt.
      • Valence Electrons:
        • The electrons in the outermost shell
        • Atoms seek to have 8 electrons in their outer shells
      • Electron Shells:
        • 1 st shell= 2
        • 2 nd shell= 8
        • 3 rd shell= 18
      Chemical Bonding
    • Valence electrons lead to bonding.
    • Chemical Bonding
      • Opposite charges attract and this leads to ionic Bonding.
    • Chemical Bonding
      • Examples of Ionic Bonding
      • NaCl
      • (Sodium Chloride)
    • Chemical Bonding
      • Examples of Covalent Bonding:
      • Water
      • (Hydrogen bonds to Oxygen)
    • Chemical Reactions
      • This describes the reaction that forms.
      • Baking a cake is creating a series of chemical reactions.
    • Chemical Breakdown
      • Example:
      • Electrolysis is used to break water molecules apart.
      • Nitrogen Cycle breaks down nitrogen bonds.