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# Lesson: Tuesday 9/1

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• 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