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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