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Saturday, May 18, 2019

Flame Test Lab

Flame streak Lab Question When a compound is bunkd in the irrupt of a burner, what happens to the excuseation of the flame? Hypothesis When the compound is placed in the flame, the flame changes color depending on the chemical compound. When theyre heated, they gain energy and changed color sometimes. Safety Requirements for this Lab Wear look at all(prenominal) times. If you want to remove them to write in your notebook you may sit at a table in the center of the room. When you sit down remove them and when you stand up ordinate them on. Use aprons. Pull back hair. No loose clothing.Close-toed shoes. NO FOOLING AROUND. It is very important that you DO NOT mix up the nichrome wire hands. Background Information When chemical compounds are heated, hey gain energy. The electrons in some of these chemicals will jump from their ground state electron configuration (such as the electron configurations we devour ben drawing for the fixingss) to high energy levels. As these electro ns fall back to their original positions in the atom, they emit energy. one and only(a) form of this energy is light energy. This is what you will be observing in this experiment. Materials Nichrome wire wand Test tubes containing water Test tubes containing 6M hydrochloric acid as needed to clean wire Test tubes containing Copper sulfate one thousand sulfate Copper treat Potassium nitrate atomic number 38 nitrate Calcium nitrate Copper chloride Strontium chloride Calcium chloride Cobalt chloride Sodium chloride Sodium nitrate Sodium sulfate atomic number 56 clroride Calcium nitrate Tirrel burner Matches Goggles Apron Procedure Work in teams of two At distributively table there are two samples and two tirrel burners and matches.Start the burner as you have learned to do and chance a low blue flame with the inner blue flame. Next take the nichrome wire and place in the flame. Noticed its color when it creates red hot. This is not the color of the flame you are looking for. The flame to observe is the one obtained just as you place it in the flame. Place the wand in the quiz tube with the solution of the compound, quickly place it in the flame and observe its color. Write down the color and any observations on the table provided below. Do this no more than three times.Then rinse the wire in the water Heat the wire in the flame until it has no residue from the compound left. If you have problems gestate your t separatelyer. Return the nichrome wire to the water test tube. When this is completed, exchange chemical compound setups with you tablemates. Repeat the procedure for each chemical compound. When your table is done with both chemical compounds, pass them both clockwise to the next table. When all chemical setups are complete, the class will discuss which chemical compounds that you would like to observe again.Analysis Each element is made up of different atoms. The heat helps the atoms move around and emit different colors of flame. solely certain elements can be identified by the naked eye. With others, you can identify an element by their colors, or if a surface, by their hardness and durability. I do not believe it would be in force(p) because some elements might be similar in most ways and have you confused. I recollect if the wire in this lab became contaminated, the results of the flame would be different.The colors of the flame would not be counteract due to the contamination and chemical compound on the wire. All of the flames dont have the aforesaid(prenominal) color because each chemical on the wire is different. It has to have a boost to a higher energy level. Once theyve fallen baxck to their first positions, they emit energy. The color of the flame is caused by the exciting metal ions. They are shown once burned just like we did in class. Copper 1s22s2 2p63s23p64s23d9 , Sodium 1s22s2 2p63s1 , Potassium 1s22s2 2p63s23p64s1 , Strontium 1s22s2 2p63s23p64s23d104p65s2Flame Test LabI. Purpose To observe th e colors produced when compounds are introduced into a flame and the electrons become excited. To estimate the wavelength of light produced, then expect the frequency and energy of the light II. Safety Standard safety procedures III. Chemical Inventory Chemical Name Hazards Lithium Chloride Moderately Toxic by ingestion Potassium Chloride Slightly hepatotoxic by ingestion Calcium Chloride Slightly toxic Barium Chloride HIGHLY toxic by ingestion.Use extreme discreetness cuprous Chloride HIGHLY toxic by ingestion. Use extreme caution IV. Pre-Lab Questions V. Procedure 1. Dip the soaked wooden splint in one chemical at a time. Make a few crystal stick to the splint 2. Hold the end of the splint with the crystals in the burner flame and watch the first color you see. When it changes to orange, the splint is burning and we dont care round that color 3. Use your chart from your prelab to estimate the wavelength of the color being produced 4. Obtain an unknown from your tea cher, record the garner of the unknown, and do a flame test on the unknown. It will be one of the chemicals you have already tested. VI. Data and Observations Chemical Color produced Estimated Wavelength (nm) Lithium Chloride Sodium Chloride Potassium Chloride Calcium Chloride Strontium Chloride Barium Chloride Cupric Chloride Unknown___ VII. Calculations For each chemical, do the following calculations. 1. Using the estimated wavelength, calculate the frequency of the light produced. 2. Using the frequency of the light, calculate the energy of each photon of light produced. VI. Conclusion VIII. Error Analysis

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