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

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  • 1. 7 TH GRADE CHAPTER 4 LESSON 2 Pgs. 134-140 For Student Use Only
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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
  • 6. 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
  • 7. 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
  • 8. CHEMICAL CHARACTERISTICS