1) Bring your school almanac (calendar book), your file/folder containing all physics homework, and all class notes you've taken during the past two months (they may be in a couple notesbooks)
2) Go back to your "What I Will Do" (yes, I know, your absolute favorites!) sheet (which you sent me last week) and highlight in red any of the things you said you'd do this week but didn't. Email me by Sunday night.
3) Read the two documents I sent by email "Atomic Theory Phys Sci 3" and "Atomic Theory Phys Sci 4" and take a minimum of 4 pages of notes
4) Answer the followig questions from the "Atomic Theory Phys Sci 1" reading assignment:
1) Consider the sentence, "If the mass of the hyrogen atom is due to the electrons embedded in positively charged matrix..." What is the meaning of "a positively charged matrix"? (p. 208)
2) Continued from last question... If there were 1,840 electrons in a hydrogen atom, then what would the "glob of positive charge (p. 208)
3) Explain what it means for electrons to move around the nucleus at a distance 100,000 times the radius of the nucleus
4) Throughout this topic, we've been learning about how scientists studying matter and energy in the 1800s and 1900s made models to describe natural phenoma. The scientists were then able to fine-tune (or change) their models after collecting new experimental data. Think about scientists today - they must too have theories and models that describe how nature works. There are millions of scientists in the world running millions of experiments everyday. How often do you think experiments lead scientists to change their ideas about how nature works? And with the millions of experiments that are taking place daily, how quickly do you think science is growing and changing?
4) As we've been learning, once upon a time, people weren't sure if matter was made of some continuous medium or if it was made of discrete particles called atoms. Then experimental evidence revealed that atoms do exist. Give examples of other things we've been reading about that were thought to have possibly been "continuous" but were in fact found to be "discrete." (I can think of 4 examples)
5) Using the mass of the H atom in atomic mass units and the mass of the H isotope (with one neutron) in atomic mass units, determine the mass of a single neutron (in atomic mass units). Then find the mass of the neturon in kg (by converting from a.m.u to kg). Does your answer agree with the accepted value of the neutron mass? (p. 209)
6) Calculate the atomic weight of oxyen. Refer to Table 8.1 for the needed values and to compare your final answer. Show all work in doing the calculations. (p. 209)
7) What is spectroscopy? (p. 210)
8) What is an incandescent gas? (p. 210)
9) Which forms of matter give off continuous spectra and which forms of matter give off discrete spectra? (p. 210)
10) What the key differences that allow some forms of matter to give off continuous spectra and other kinds to give off discrete spectra (p. 210)
5) Answer the followig questions from the "Atomic Theory Phys Sci 2" reading assignment:
1) Describe how we might be able to determine the elements making up a star by looking at line spectra. (p. 211)
2) In the Balmer Series, which violet line has more energy, n=5 or n=6? (HINT: look at the wavelenghth of the light and figure out whether longer or shorter wavelengths of light have more energy)
3) We know that hydrogen atoms do not emit light when in their "normal state." Under what conditions do they emit light?
4) Based on what's written in the "Allowed Orbits" section, suppose that I find that a particular atom (this is just an exercise and the proportions given are completly unrealistic) has orbits located at the following distances from the nucleus: orbit a) 1 cm; orbit b) 1.5 cm; orbit c) 3 cm. Draw a diagram and label the orbits and their distances from the nucleus. Which orbit has the highest energy?
2) Go back to your "What I Will Do" (yes, I know, your absolute favorites!) sheet (which you sent me last week) and highlight in red any of the things you said you'd do this week but didn't. Email me by Sunday night.
3) Read the two documents I sent by email "Atomic Theory Phys Sci 3" and "Atomic Theory Phys Sci 4" and take a minimum of 4 pages of notes
4) Answer the followig questions from the "Atomic Theory Phys Sci 1" reading assignment:
1) Consider the sentence, "If the mass of the hyrogen atom is due to the electrons embedded in positively charged matrix..." What is the meaning of "a positively charged matrix"? (p. 208)
2) Continued from last question... If there were 1,840 electrons in a hydrogen atom, then what would the "glob of positive charge (p. 208)
3) Explain what it means for electrons to move around the nucleus at a distance 100,000 times the radius of the nucleus
4) Throughout this topic, we've been learning about how scientists studying matter and energy in the 1800s and 1900s made models to describe natural phenoma. The scientists were then able to fine-tune (or change) their models after collecting new experimental data. Think about scientists today - they must too have theories and models that describe how nature works. There are millions of scientists in the world running millions of experiments everyday. How often do you think experiments lead scientists to change their ideas about how nature works? And with the millions of experiments that are taking place daily, how quickly do you think science is growing and changing?
4) As we've been learning, once upon a time, people weren't sure if matter was made of some continuous medium or if it was made of discrete particles called atoms. Then experimental evidence revealed that atoms do exist. Give examples of other things we've been reading about that were thought to have possibly been "continuous" but were in fact found to be "discrete." (I can think of 4 examples)
5) Using the mass of the H atom in atomic mass units and the mass of the H isotope (with one neutron) in atomic mass units, determine the mass of a single neutron (in atomic mass units). Then find the mass of the neturon in kg (by converting from a.m.u to kg). Does your answer agree with the accepted value of the neutron mass? (p. 209)
6) Calculate the atomic weight of oxyen. Refer to Table 8.1 for the needed values and to compare your final answer. Show all work in doing the calculations. (p. 209)
7) What is spectroscopy? (p. 210)
8) What is an incandescent gas? (p. 210)
9) Which forms of matter give off continuous spectra and which forms of matter give off discrete spectra? (p. 210)
10) What the key differences that allow some forms of matter to give off continuous spectra and other kinds to give off discrete spectra (p. 210)
5) Answer the followig questions from the "Atomic Theory Phys Sci 2" reading assignment:
1) Describe how we might be able to determine the elements making up a star by looking at line spectra. (p. 211)
2) In the Balmer Series, which violet line has more energy, n=5 or n=6? (HINT: look at the wavelenghth of the light and figure out whether longer or shorter wavelengths of light have more energy)
3) We know that hydrogen atoms do not emit light when in their "normal state." Under what conditions do they emit light?
4) Based on what's written in the "Allowed Orbits" section, suppose that I find that a particular atom (this is just an exercise and the proportions given are completly unrealistic) has orbits located at the following distances from the nucleus: orbit a) 1 cm; orbit b) 1.5 cm; orbit c) 3 cm. Draw a diagram and label the orbits and their distances from the nucleus. Which orbit has the highest energy?
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