Lesson: Tuesday 9/1


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Lesson: Tuesday 9/1

  1. 1. Launch <ul><li>What are two quantities that define matter? </li></ul><ul><li>Draw and give the name of the instruments used to measure each? </li></ul><ul><li>Volume can be expressed in units of </li></ul><ul><ul><li>L. </li></ul></ul><ul><ul><li>cm. </li></ul></ul><ul><ul><li>cm 3 . </li></ul></ul><ul><ul><li>both a and c. </li></ul></ul>
  2. 2. What is the Atom? Mr. Heffner Chemistry 9/1/09
  3. 3. Aluminum Activity <ul><li>Everyone stand up! </li></ul><ul><li>Have partner on the right side hold the foil </li></ul><ul><ul><li>Rip the foil in half </li></ul></ul><ul><ul><li>Hand to partner on the left side </li></ul></ul><ul><li>Have partner on the left side hold the foil </li></ul><ul><ul><li>Rip the foil in half </li></ul></ul><ul><ul><li>Hand to partner on the left side </li></ul></ul><ul><li>Once you can no longer rip the foil into two pieces, sit down </li></ul><ul><li>Goal: the last group standing wins! </li></ul>
  4. 4. Aluminum Activity <ul><li>On your notes, answer the following: </li></ul><ul><ul><li>How many times were you able to rip it in half? </li></ul></ul><ul><ul><li>What stopped you from ripping it in half one more time? </li></ul></ul><ul><ul><li>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? </li></ul></ul>
  5. 5. What is the Atom? <ul><li>Democritus – Greek philosopher (650 B.C.) </li></ul><ul><ul><li>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 </li></ul></ul><ul><ul><li>Greek = atomos </li></ul></ul><ul><ul><ul><li>Translates to “indivisible” </li></ul></ul></ul>
  6. 6. What is the Atom? <ul><li>John Dalton (1800) </li></ul><ul><li>Dalton’s Laws </li></ul><ul><ul><li>The atom is the smallest unit of matter </li></ul></ul><ul><ul><ul><li>Indivisible </li></ul></ul></ul><ul><li>Atomic Theory </li></ul><ul><ul><li>Atoms are the building blocks of all matter </li></ul></ul>
  7. 7. What is the Atom? <ul><li>Like most scientists, John was partly right and partly wrong </li></ul><ul><ul><li>The atom is the smallest unit of matter </li></ul></ul><ul><ul><li>But the atom can still be further divided into 3 subatomic particles </li></ul></ul><ul><ul><ul><li>Protons </li></ul></ul></ul><ul><ul><ul><li>Neutrons </li></ul></ul></ul><ul><ul><ul><li>Electrons </li></ul></ul></ul>
  8. 8. How Small is the Atom? <ul><li>Really small. Really, really small. </li></ul><ul><li>Aluminum foil is about 90,000 atoms thick </li></ul><ul><li>It would take 10 trillion atoms laid side-by-side to span a centimeter. </li></ul><ul><li>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 </li></ul><ul><li>The size of an atom is to a dust speck, as a dust speck is to the entire earth </li></ul>
  9. 9. Practice Questions <ul><li>What is atomic theory? </li></ul><ul><li>Where does the term “atom” come from and what is its literal translation? </li></ul><ul><li>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.” </li></ul><ul><li>How small is the atom? Give an example of its size. </li></ul><ul><li>What are the two standard units for volume? </li></ul><ul><li>What is the standard unit for mass? </li></ul>
  10. 10. Summary <ul><li>The smallest unit of matter is the atom. </li></ul><ul><ul><li>Which means that everything is made of atoms! </li></ul></ul><ul><li>Even though the atom is really small, it can still be divided into 3 subatomic particles. </li></ul><ul><li>Just in case you missed it, the atom is super duper small. In fact, the atom is just about as small as it gets. </li></ul>
  11. 11. Exit Slip <ul><li>Matter is </li></ul><ul><ul><li>made of atoms. </li></ul></ul><ul><ul><li>defined as having mass and volume. </li></ul></ul><ul><ul><li>stuff. </li></ul></ul><ul><ul><li>all of the above. </li></ul></ul><ul><li>Which of the following is true about the atom? </li></ul><ul><ul><li>it is so small that about 100 can fit on the tip of a pencil </li></ul></ul><ul><ul><li>it is always negatively charged </li></ul></ul><ul><ul><li>it is the smallest unit of matter </li></ul></ul><ul><ul><li>it is larger than a cell </li></ul></ul>
  12. 12. Exit Slip <ul><li>How many atoms are there in your fingernail? </li></ul><ul><ul><li>Less than 10 </li></ul></ul><ul><ul><li>Between 10 and 10,000 </li></ul></ul><ul><ul><li>Between 10,000 and 1,000,000,000,000 (one trillion) </li></ul></ul><ul><ul><li>More than 1,000,000,000,000 (one trillion) </li></ul></ul><ul><li>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.” </li></ul><ul><li>What is the standard unit of measurement for mass? </li></ul>
  13. 13. Homework <ul><li>Finish Practice Questions </li></ul><ul><ul><li>At the bottom, write your own summary of today’s lecture </li></ul></ul>