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Lesson: Tuesday 9/1

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Two quantities that define matter are volume and mass. Volume can be measured using units like liters, cubic centimeters. Mass is measured using standard units like grams. The document discusses the history of atomic theory. Ancient Greek philosophers proposed the idea of atoms as the smallest indivisible units of matter. In the 1800s, John Dalton further developed atomic theory, proposing that atoms are the building blocks of all matter and composed of even smaller subatomic particles like protons, neutrons and electrons. The size of an atom is incredibly small. For example, about 10 trillion atoms could fit in a single centimeter. Despite their small size, atoms are not truly indivisible as originally proposed, as they can be broken

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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.
What is the Atom? Mr. Heffner Chemistry 9/1/09
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!
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?
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 cant be broken down Greek = atomos Translates to indivisible
What is the Atom? John Dalton (1800) Daltons Laws The atom is the smallest unit of matter Indivisible Atomic Theory Atoms are the building blocks of all matter
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
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
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?
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.
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
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?
Homework Finish Practice Questions At the bottom, write your own summary of todays lecture

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Lesson: Tuesday 9/1

  • 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 cant be broken down Greek = atomos Translates to indivisible
  • 6. What is the Atom? John Dalton (1800) Daltons 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 todays lecture