atomic_energy_lab333

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St. Augustine's University *

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201

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Chemistry

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Jan 9, 2024

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docx

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Atomic Energy Lab Instructions: Complete all sections of this report and answer all questions in complete sentences for full credit. Title: Objective(s): Hypothesis: Choose the hypothesis that best suits this lab (delete the other one) Each emission spectrum will produce its own unique element that can be used to determine the composition of a newly discovered star. Each heated element will produce its own unique emission spectrum that can be used to determine the composition of a newly discovered star. Materials: What scientific equipment and tools were used to collect data in the simulation? (Record the materials as you work through the simulation.) Part I Materials Part II Materials Bunsen burner, barium, calcium sodium, rubidium, potassium, litum, test tubes, platinum wire, hydrochloric acid (HCI) Spectroscope, light source, hydrogen helium, neon, mercury, prisim, heat, spectrum, slit (to shine light through) Variables: Remember the three variables: controlled (what is kept the same), independent (what is tested or changed), and dependent (what is the outcome or observed). List variables below as you work through the simulation. Variable Part I Variables Part II Variables Controlled test tube, Bunsen burner, platinum wire, hydrochloric acid used to clean the platinum wire temp of flame prism, light angle light source size of prism size of slit wavelength measuring tool Unless Otherwise Noted All Content © 2022 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.
Independen t Element used Element used Dependent Color of flame The light beams on the color spectrum/their wavelengths Procedure: Clear steps are in the simulation. No written procedure is needed for this virtual experience. However, it is important that you understand the experimental design of this lab for the conclusion section. Data: Record your measurements below using the correct number of significant figures. The saved results of your measurements can also be found by selecting the data table button within the virtual lab. Note: First trials have been completed as a model. You still need to go through trial 1 in the simulation. Part I: Flame Tests Element Color Description Barium Light green throughout flame Calcium Light red throughout the flame Sodium Light yellow throughout the flame Rubidium Light purple throughout the flame Potassium Light blue throughout the flame Lithium Light pink throughout the flame Unless Otherwise Noted All Content © 2022 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.
Unknown One Light pink throughout the flame Unknown Two Light blue throughout the flame Part II: Spectrometry Spectru m Line Hydrogen 9 lines Helium 5 lines Neon 10 lines Mercury 8 lines Star 6 lines 1 purple, 410 nm Blue 450 nm Purple 420 nm Dark blue 430 nm Purple 410 nm 2 blue, 440 nm Green 510 nm Green 510 nm Blue 450 nm Purple 420 nm 3 green, 510 nm Yellow 590 nm Green 520 nm Green 540 nm Blue 440 nm 4 light green, 540 nm Red 690 nm Green 530 nm Lime 550 nm Cyan 500 nm 5 light green, 550 nm Dark red 730 nm Yellow 570 nm Yellow 570 nm Light green 550 nm 6 yellow, 570 nm x Yellow 580 nm Red 670 nm Yellow 580 nm 7 red, 650 nm x Red 700 nm Red 690 nm Red 700 nm 8 red, 680 nm x Red 710 nm Red 710 nm Red 710 nm 9 red, 700 nm x Red 720 nm x x 10 x x Dark red 750 x x If possible, it might be helpful to take a screenshot of the elements from the Compare tab in the lab to help with conclusions. Conclusion Using complete sentences, write a conclusion that addresses the following: The purpose of the lab, what you explored, what you learned A statement identifying the two unknown elements found in the flame test (use your data) A statement identifying unknown elements that make up the star (use your data) Do your data support or fail to support your hypothesis (include examples)? Unless Otherwise Noted All Content © 2022 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.
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Post-Lab Connection Questions Answer questions in complete sentences and show work. 1. In Parts I and II of the lab, how did the electrons of each element help to produce the different colors of light? Explain your answers using important terms from the lesson and information provided in the laboratory. When an electron absorbs energy and moves to a higher energy level in a atom its in a excited state as it returns to its normal state ir realeses this energy as light the color of this light depends on the electrons emission Spectron which is based on the light frequency and wavelength different elements produce different colors of light and this is used to identify them 2. Stars comprised of mostly light (less massive) elements, such as hydrogen and helium, are often younger stars. Based on your data, is the newly discovered star a younger or older star? Explain your answer. The newly discovered star appears to be moderately young because it mainly exhibits wavelengths associated with lighter elements like hydrogen and helium however the presence of some wavelengths matching mercury suggests its not extremely old in summary it’s a middle aged star that leans more towards being on the younger side Unless Otherwise Noted All Content © 2022 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School. In the lab I learned I identified two unknown elements lithium (pink flame) and potassium (blue flame) based on the colors they produced when exposed to a flame additionally I made a hypothesis that an unknown star composition might be hydrogen helium and mercury by comparing its spectrum to those of these elements my hypothesis was confirmed by matching wavelengths the key takeaway is that each element has unique emission spectrum which helps in their identification and analyzing celestial objects