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7th Grade Chapter 4 Lesson 3
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7th Grade Chapter 4 Lesson 3

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    7th Grade Chapter 4 Lesson 3 7th Grade Chapter 4 Lesson 3 Presentation Transcript

    •  
      • Chemistry is the study of composition, structure, and properties of matter, as well as the changes which matter under-goes.
      • Mixture: consist of two or more substances that retain their chemical and physical properties when mixed together
      • Mixtures:
        • The substances are not chemically mixed or changed chemically
        • Salt and pepper will mix but never chemically join
      • Compounds:
        • A new substance formed from the chemical union of two or more elements.
      • Chemical Bonding:
        • Atoms want to achieve stability
        • Valence electrons: electrons in an atom’s last unfilled electron shell
        • When an atom achieves 8 electrons in outer most shell it is considered stable
          • Different atoms have different numbers of valence electrons
      • Chemical Bonding:
        • Ion- charged particle results from the loss or gain of electrons
        • Ionic Bond- a chemical bond in which electrons are completely transferred from one atom to another
        • Positive and Negative bonding
          • NaCl= sodium chloride
      • Chemical Bonding:
        • Covalent Bond:
          • Atoms share electrons in order to in order to complete their outer shells
          • Share electrons
          • H 2 O= covalent bonding
      • Chemical Reaction:
        • This is the representation of a chemical reaction in terms of chemical symbols
        • Baking a cake- has chemical reactions
      • Chemical Breakdown:
        • Substances can also decompose or break apart
        • Electrolysis is a way to chemically spilt