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  • 1. Chapter 8: The Mole
    Section 8-1: How are atoms counted and measured?
  • 2. Review: Chapter 3
    Bonus Point Opportunity!
    Atomic Theory:
    All Matter is composed of atoms
    What is the SI unit for the amount of substance?
    The Mole
    Avagadro’s Number
    6.022 X 1023 particles/atoms/ions
  • 3. Lesson Overview and Objectives
    By the end of this lesson you will understand how atoms are counted and measured
    You will be able to define a mole and what it represents
    You will be able to recite Avagadro’s number and what it represents
    You will be able to convert from the number of moles in an element to the number of particles/atoms/ions/etc
    You will be able to convert from the number of particles/atoms/ions/etc in an element to the number of moles
  • 4. Review: Conversions
    Math Review
    If you have 26 meters how many kilometers do you have?
    What are we looking for?
    Kilometers
    How do we set up the conversion so meters cancel?
    26 m X 1 km
    1 1000 m
    26 m X 1 km =
    1 1000 m
    26 km = .026 km
    1000
  • 5. What is a Mole?
    Elements are made up of atoms - the number of atoms in a small sample of an element is astronomical
    Scientists needed to find a way to deal with them on a larger scale- so they created a new unit of quantity
    The mole is:
    The number of atoms in exactly 12g of carbon-12
  • 6. What Does a Mole Represent?
    “Is a counting unit used for measuring an amount of a substance”
    Refer to table 8-1 on page 275 in text
    Easter Eggs, pennies, spoons
  • 7. What is Avagadro’s Number?
    Avagadro’s number is the number of particles in a mole
    6.022 X 1023 particles in a mole
    Avagadro’s number is a constant, meaning that it does not change
  • 8. What Does Avagadro's Number Represent?
    While Avagadro’s number represents the number of particles in a mole, particles has multiple meanings
    Particles can mean:
    Atoms, Ions, molecules, electrons, bonds, etc
    How many atoms are in a mole?
    6.022 X 1023
    How many Ions are in a mole?
    6.022 X 1023
    How many molecules are in a mole?
    6.022 X 1023
  • 9. Concept Check: Avagadro’s Number
    What is Avagadro’s Number?
    Avagadro’s number is the number of particles in a mole
    6.022 X 1023
    What can a particle represent?
    Atoms
    Ions
    Molecules
    • How many moles are in 6.022 X 1023 atoms of H?
    1 mole
    How many Ions are in one mole of Na?
    6.022 X 1023
    How many atoms are in 2 moles of He?
    1.2044 X 1024
  • 10. Conversion Time: Moles to Atoms
    Convert 4.2 Moles of He to atoms
    Convert 3.6 Moles of N to atoms
    Convert 1.3 Moles of C to ions
    Convert 2.6 moles of Na to molecules
  • 11. Conversion Time: Atoms to Moles
    Convert 6.4 X 1023 atoms of S to Moles
    Convert 8.6 X 1024 atoms of F to Moles
    Convert 1.3 X 1023 atoms of Si to Moles
    Convert 4.2 X 1023 ions of Ni to Moles
    Convert 2.3 X 1023 molecules of C to Moles
  • 12. Wrap-Up
    When converting atoms/ions/molecules/etc to moles what constant do you use?
    6.022 X 1023
    What is that constant called?
    Avagadro’s Number
    How many ions are in one mole?
    6.022 X 1023
    Questions?