CHEM101L Lab 5 F

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CHEM101L

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Chemistry

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Feb 20, 2024

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Lab 5 Electron Configuration CHEM101L Student Name: Ani Harutyunyan Access Code (located on the lid of your lab kit): AC-ND9MT9 Lab Report Format Expecta0ons U"lize college level grammar and professional forma4ng when comple"ng this worksheet. Report all equa"ons in a proper mathema"cal format, with the correct signs and symbols. Pre-Lab Ques?ons 1. What is an electron configura=on? Provide a response in the context of energy levels. It indicates the posi=on of each electron within the atom, with electron configura=on revealing the distribu=on and arrangement of electrons in their atomic orbits. 2. Of the following colors, which would correspond to the highest energy photons (light) and which would correspond to the lowest energy? red, orange, yellow, green, blue, indigo, violet highest- violet lowest- red EXPERIMENT 1: OBSERVING COLORS PRODUCED FROM VARIOUS METALS Introduc?on Ques?ons 1. In this experiment, you will conduct an experiment where atoms are heated with a flame. As the atoms gain heat from the flame, different colors of light will be produced. What is causing this light to be produced? Why are they different colors? Upon hea=ng in a flame, atoms make their electrons ascend to higher energy states, and during their return to lower states, they emit light, with each element's unique electron configura=on leading to characteris=c colors that allow for its iden=fica=on. 2. Pick an element from the periodic table that shares a leTer or two in common with the leTers in your name. State the element name, its symbol, and its electron configura=on below. sodium- Na ( 1s² 2s² 2p⁶ 3s¹ ) 3. What is the purpose of Step 6 in the experimental procedure? It is essen=al for coa=ng the inocula=ng loop with LiCl solu=on, necessary for observing the specific color changes in the flame caused by LiCl.
Lab 5 Electron Configuration CHEM101L 4. Write out the electron configura=ons for each of the following elements in the below table. Potassium is already done as an example for you. Data and Observa?ons In the below table, report your observa=ons for each sample as you introduced them into the flame, being sure to denote the color produced. Table 1: Results of firework material igni?on Below, insert a photo of your lab setup a^er you tested each sample. The purpose of this photo is to demonstrate that the experiment was completed, so it must have the correct materials and denote that the experiment was conducted. Your name must also be present in the photo for credit on this lab. Element Electron Configura?on K 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 Li 1s² 2s¹ Na 1s² 2s² 2p⁶ 3s¹ Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² Substance Observa?ons Lithium Chloride Bright red flame Sodium Chloride Yellow flame Potassium Chloride light purple flame Calcium Chloride Orange/red flame
Lab 5 Electron Configuration CHEM101L Results and Discussion 1. For each of the igni=on sources, denote the wavelength of the photons that correspond to the colors you observed during the experiment in the table below. 2. Which of the metals produced the highest energy photons? sodium chloride (NaCl) 3. Did sodium chloride and potassium chloride give off similar colors? Why or why not? Sodium chloride (NaCl) and potassium chloride (KCl) emiTed different colors in flames, with NaCl showing yellow and KCl displaying lilac, due to the unique energy transi=ons and wavelengths of sodium and potassium electrons. Salt Color Wavelength LiCl Red flame 650 nm NaCl Yellow flame 580 nm KCl light purple flame 420 nm CaCl 2 Orange-red flame 610 nm
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