Lesson: Tuesday 9/1
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Transcript

  • 1. Launch
    • What are two quantities that define matter?
    • Draw and give the name of the instruments used to measure each?
    • Volume can be expressed in units of
      • L.
      • cm.
      • cm 3 .
      • both a and c.
  • 2. What is the Atom? Mr. Heffner Chemistry 9/1/09
  • 3. Aluminum Activity
    • Everyone stand up!
    • Have partner on the right side hold the foil
      • Rip the foil in half
      • Hand to partner on the left side
    • Have partner on the left side hold the foil
      • Rip the foil in half
      • Hand to partner on the left side
    • Once you can no longer rip the foil into two pieces, sit down
    • Goal: the last group standing wins!
  • 4. Aluminum Activity
    • On your notes, answer the following:
      • How many times were you able to rip it in half?
      • What stopped you from ripping it in half one more time?
      • Even with the right tools, is there a point at which you could no longer split the foil in half? Or, could you indefinitely split the foil into smaller and smaller pieces?
  • 5. What is the Atom?
    • Democritus – Greek philosopher (650 B.C.)
      • Suggested that if you keep splitting an object in half, you will finally get to a tiny fundamental piece that can’t be broken down
      • Greek = atomos
        • Translates to “indivisible”
  • 6. What is the Atom?
    • John Dalton (1800)
    • Dalton’s Laws
      • The atom is the smallest unit of matter
        • Indivisible
    • Atomic Theory
      • Atoms are the building blocks of all matter
  • 7. What is the Atom?
    • Like most scientists, John was partly right and partly wrong
      • The atom is the smallest unit of matter
      • But the atom can still be further divided into 3 subatomic particles
        • Protons
        • Neutrons
        • Electrons
  • 8. How Small is the Atom?
    • Really small. Really, really small.
    • Aluminum foil is about 90,000 atoms thick
    • It would take 10 trillion atoms laid side-by-side to span a centimeter.
    • There are as many atoms in a cubic cm of copper as there are drops of water in all the oceans or grains of sand on all the seashores of the earth
    • The size of an atom is to a dust speck, as a dust speck is to the entire earth
  • 9. Practice Questions
    • What is atomic theory?
    • Where does the term “atom” come from and what is its literal translation?
    • True or False (and if false, re-write the statement so that it is true). “Everything that we can see, touch, and feel is made of atoms.”
    • How small is the atom? Give an example of its size.
    • What are the two standard units for volume?
    • What is the standard unit for mass?
  • 10. Summary
    • The smallest unit of matter is the atom.
      • Which means that everything is made of atoms!
    • Even though the atom is really small, it can still be divided into 3 subatomic particles.
    • Just in case you missed it, the atom is super duper small. In fact, the atom is just about as small as it gets.
  • 11. Exit Slip
    • Matter is
      • made of atoms.
      • defined as having mass and volume.
      • stuff.
      • all of the above.
    • Which of the following is true about the atom?
      • it is so small that about 100 can fit on the tip of a pencil
      • it is always negatively charged
      • it is the smallest unit of matter
      • it is larger than a cell
  • 12. Exit Slip
    • How many atoms are there in your fingernail?
      • Less than 10
      • Between 10 and 10,000
      • Between 10,000 and 1,000,000,000,000 (one trillion)
      • More than 1,000,000,000,000 (one trillion)
    • True or False (and if false, re-write the statement so that it is true). “Atoms are the smallest unit of matter and therefore, cannot be divided.”
    • What is the standard unit of measurement for mass?
  • 13. Homework
    • Finish Practice Questions
      • At the bottom, write your own summary of today’s lecture