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Atomic Theory
Light, Electromagnetic Spectrum, Photons... That stuff...
Atomic Structure/Electron Configurations... That stuff....
100
A common every-life analogy for atoms is comparing atoms to LEGOs in a LEGO set. To what degree is this analogy comparable with Dalton’s atomic theory? Explain using Dalton’s atomic theory.
Dalton's atomic theory states that atoms cannot be destroyed, created, or broken. They combine together in whole numbers, without being split. If they are split, we know now that the instability causes huge explosions! So, like LEGOs, they can be combined in whole units, without breaking them into fractions. This analogy is very comparable, minus the fact that LEGOs won't explode when you split them!
100
#4 from your exam...
Ultraviolet light has the highest frequency/lowest wavelength of those three sources of electromagnetic radiation, which means it gives off the most energy. This is reflected on the diagram that the jump from level 7 to level three takes less energy as it does to get from level 3 to level 1.
100
Draw a Bohr model for Magnesium:
(Show whiteboards)
200
How was the nucleus discovered? Explain in as much detail as possible!
Rutherford fired alpha particles at gold foil. He expected most of them to go through the foil, and most of them did, but a small amount of them were deflected by something inside the gold atoms. Since the alpha particles were positive, the thing deflecting them must have also been positive, and he called this positive, dense mass in the gold atoms the nucleus.
200
The grass out on Weber Point is green because it absorbs all wavelengths of light except the wavelength at 510 nm, which it reflects. What is the frequency of the photons that are being emitted from the grass? Show complete calculation.
What is 5.9 x 10^-14 Hz
200
Draw a Bohr Model for Chlorine:
Show white boards
300
How were electrons discovered? Explain in as much detail as possible.
J.J. Thompson was conducting an experiment using cathode rays and noticed that when he placed a negatively charged magnet near them, they bent away from that magnet (and were attracted towards a positively charged magnet). He called the cathode rays electrons, and from his observations, we know that electrons are negative.
300
What is the energy of the photons that are emitted from the reflected light from the grass in problem 5? Show complete calculation.
What is 3.9x10^-19 J
300
Write the electron configuration for Magnesium:
1s22s22p63s2
400
The majority of an atom is made of mostly _____________. What study do we know of that proved this?
What is empty space, Mr. P! Rutherford's study showed that most of an atom was empty space because MOST of his positively charged alpha particles went straight through the gold foil!
400
Cassie gets an X-ray on her arm after taking a blazing fastball to her left elbow. The X-rays she receives have a wavelength of 3.5 nm. Compare the energy of the X-rays to the energy of the photons that produce green light in problems 5 and 6 and discuss how this might explain why there are safety concerns regarding X-rays in the medical field.
The energy of the X-rays is about 1.6 x 10^-17 J. This is 2 orders of magnitude greater (100x) than 3.9x10^-19 J. This is definitely going to cause some damage to cells, atoms, etc. in your body, and so there are safety precautions taken in the medical field regarding X-rays.
400
Which model is the best atomic model we have?
The Quantum model: - 3D - Heisenburg's uncertainty principle
500
Mr. Pia-trivia: What is Mr. P's college alma mater?
What is University of Redlands!
500
Where did Mr. Piasecki teach for his first 2 years of teaching after college?
What is the dirty south! (Mississippi!)
500
Which teacher took Mr. P's test away from him because he was being loud and obnoxious at Franklin high school who he works with here at Stockton Collegiate?
Who is Shari Potter.