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Thursday 10/9/08

Thursday 10/9/08. 1 st 5 (new sheet): What’s matter? TURN IN : n/a TODAY: Chemistry intro: Matter notes Review Test 1 Mid-quarter Progress Reports HOMEWORK : Signed progress report due next class. Progress Report Letter Home. Dear ________________,

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Thursday 10/9/08

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  1. Thursday 10/9/08 1st 5 (new sheet): What’s matter? TURN IN: n/a TODAY: • Chemistry intro: Matter notes • Review Test 1 • Mid-quarter Progress Reports HOMEWORK: Signed progress report due next class

  2. Progress Report Letter Home Dear ________________, Here is my mid-quarter progress report for Physical Science. So far, I have earned a ___. One assignment I am especially proud of is ______ because ____. I have _____ missing assignments. One assignment I could have done better on is ____. Next time I will ___. One way I can bring my grade up is to _____. My goal for 1st quarter is to earn a(n) ______. Thank you for taking the time to review my grade. (Insert note of appreciation here.) Your ______, (signature) Copy this letter on the back of your progress report. Fill in the blanks. Return with a parent signature by next class for 3 bonus points.

  3. What's the Matter? People have long made observations of the world and asked the question, “What’s the matter?”… in other words, “what is the physical world made of?” Is there something that is fundamentally similar about the seemingly different things we see? And in true scientific form, they began to hypothesize about this… the following are theories proposed and the evidence that supported them.

  4. John Dalton • Dalton hypothesized that in reality, all physical substances could only be divided a certain number of times… there came a point you could no longer divide the substance to a smaller thing. This thing was called “atom” after the Greek word for indivisible. Dalton imagined an indivisible sphere… the atom

  5. J.J. Thomson • While conducting an experiment, Thomson observed a strange phenomena. His hypothesis was that these atoms of Dalton’s contained opposing charges… positive and negative. Thus, Thompson proposed that the indivisible/fundamental atom included “bits” of charge within it. Thompson imagined an indivisible sphere… the atom with charges

  6. Ernest Rutherford • While conducting an experiment (Gold Foil), Rutherford made a strange observation… his hypothesis included organizing where the charges in the atom were located. He choose to assign the + to the things in the center… and left the – to be organized around the + center. Positive things in the center, negative around them

  7. Niels Bohr • While observing the light emitted from excited gasses, Bohr hypothesized that the negative things in an atom (electrons) were organized in certain energy levels around the positive center (protons & neutrons). Rutherford’s model, plus specific levels for electrons to “orbit”

  8. Even Stranger... • Numerous observations since Bohr leaves scientist to think of electrons as incredibly strange space filling “things” not quite a particle as once thought… but still negatively charged… an “electron cloud” organized around the nucleus of protons and neutrons. A cloud of negative “electrons” around the protons and neutrons in the center

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