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7th Grade Chapter 4 Lesson 2
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7th Grade Chapter 4 Lesson 2

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    7th Grade Chapter 4 Lesson 2 7th Grade Chapter 4 Lesson 2 Presentation Transcript

    • 7 TH GRADE CHAPTER 4 LESSON 2 Pgs. 134-140 For Student Use Only
    • CHEMICAL CHARACTERISTICS
      • Chemical Properties:
        • The properties that describe how a substance changes while it is being converted into something else
        • Chemical Change: When two or more substances unit or break apart chemically
          • After a chemical change the properties of the new substance are different from the original properties
    • CHEMICAL CHARACTERISTICS
      • Microscopic Matter:
        • Element= simplest type of substance
          • All elements are made of atoms
        • Atoms= smallest particles of matter
          • An element cannot be broken down into anything smaller than one particular kind of atom
        • Compound= a new substance formed from the chemical union of two or more elements
    • CHEMICAL CHARACTERISTICS
      • Matter:
        • Compounds differ from each by the ratio of atoms
          • Examples:
            • H 2 O
            • H 2 O 2
        • Chemical Formula:
          • The written way to show compounds
        • Chemical Reaction:
          • The process of forming a chemical bond
    • CHEMICAL CHARACTERISTICS
      • Petite Particles:
        • Atoms were thought to be the smallest particles for a long time
        • Atoms are made up of particles:
          • In the Nucleus:
            • Protons= positively charged particles
            • Nuetrons= no charge or neutral
          • Atomic Number= number of protons in the nucleus
          • Electrons= outside nucleus and have a negative charge
        • Size must be written in Scientific Notation (Get rid of zeros)
          • Atomic Mass= number of protons and neutrons together, always written as a whole number
    • CHEMICAL CHARACTERISTICS
      • The Atom:
        • Electrons orbit in shells
          • 1 st shell= 2 electrons
          • 2 nd shell= 8 electrons
          • 3 rd shell= 18 electrons
          • 4 th shell= 32 electrons
        • A stable atom:
          • Equal number of protons and electrons
          • Has no charge
    • CHEMICAL CHARACTERISTICS
      • Atom Classification:
        • Molecule: When 2 or more atoms are chemically united
          • Can be different atoms
          • Can also be same atoms
        • Chemical Symbols:
          • Each element has a symbol
          • Symbols have one, two, or sometimes three letters
          • Elements are arranged by atomic number and symbol in the periodic table of elements
      • Periodic Table of Elements:
        • Designed by Dmitri Ivanovich Mendeleev
    • CHEMICAL CHARACTERISTICS