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1.4: Experiment 2 - Atomic Theory

  • Page ID
    291225
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    Learning Objectives

    By the end of this lab, students should be able to:

    • Compare the Bohr model of the atom with the Schrödinger's model.
    • Explain how light interacts with matter to produce line spectrum.
    • Calculate the relationship between wavelength and energy of a photon.

    Prior knowledge:

    The smallest piece of an element that maintains the identity of that element is called an atom. Individual atoms are extremely small. It would take about fifty million atoms in a row to make a line that is 1 cm long. The period at the end of a printed sentence has several million atoms in it. Atoms are so small that it is difficult to believe that all matter is made from atoms-but it is.

    Pre-Lab Primer

    This assignment is an individual assignment to be completed on your own with the help of the "Prior Knowledge" links at the top of this page. The assignment will be due 10 minutes before your lab begins. Late work will not be accepted.

    The document below is a preview only. You will be able to find your assignment to work on in your Google Classroom.

    Interactive Element

    In-Lab Assignments

    Individual Lab Report

    Using Zoom breakout groups, you can work together with your group members to answer the questions in the "Atomic Theory Lab Report". This is an individual assignment, so while you can work with your peers, all work must be in your own words. Use the PhET simulation below to answer the questions in your Lab Report.

    Part I: White light

    1. Turn on the gun.
    2. Make sure you selected "White".
    3. Select "Show spectrometer"
    4. Answer the questions in Part I of the Lab Report.

    Part II: Prediction with Bohr's Model

    1. Switch from Experiment to Prediction in the upper left hand corner of the simulation. 
    2. Switch to the Bohr model and turn on the Show electron energy level diagram in the upper right hand corner. Watch to see what happens in the simulation, the electron energy level diagram and the spectrometer. 
    3. Answer the questions in your report regarding this model.

    Part III: Prediction with Schrödinger's Model

    1. Make sure Prediction is selected in the upper left hand corner of the simulation
    2. Switch to the Schrödinger model.
    3. Answer the questions in your report regarding this model.

     

    The document below is a preview only. You will be able to find your assignment to work on in your Google Classroom.

    Interactive Element

     

    Post-Lab Problem Set

    After you have had a chance to use the PhET simulation and complete your assignment with your group during lab, you will be given the Atomic Theory Post-Lab Problem Set. This is an individual assignment that must be completed on your own, and it is based on your Pre-Lab Primer and your In-Lab Assignment. This assignment will be due the day after your lab meets by 5 p.m. For example, if your lab is on Monday, the Post-Lab Problem Set will be due on Tuesday at 5 p.m. No late work is accepted. 

    The document below is a preview only. You will be able to find your assignment to work on in your Google Classroom.

    Interactive Element

    Contributors

    Contributors and Attributions

    • Robert E. Belford (University of Arkansas Little Rock; Department of Chemistry) led the creation of this page for a 5 week summer course. 

    • Elena Lisitsyna contributed to the creation and implementation of this page.

    • Mark Baillie coordinated the modifications of this activity for implementation in a 15 week fall course, with the help of Elena Lisitsyna and Karie Sanford.

     


    1.4: Experiment 2 - Atomic Theory is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.