Students will record the dominant flame color observed. Then identify the unknown by matching the flame color to one of the known metal ions. The purpose of the lab is to observe the characteristic colors produced by certain metallic ions when vaporized in a flame. Flame test lab objective in this lab students will learn about atomic energy levels, emission spectroscopy, and flame tests for element identification. The flame test lab was an inclass lab where we tested chemicals in the flames to see the wide range of colors in the color spectrum. Conclusion the purpose of this lab was to see what colors are characteristic of particular metallic ions in a flame test and use their characteristic color to identify other elements. Flame tests of metal cations experiment chemistry libretexts. In your report you will also need to incorporate the rerun format after. Flame test lab report salt chemistry metals free 30day trial. A flame test uses the concept of electron excitation to identify an element. Move the flame under the stick to find the best color. Its purpose is to identify specific elements in a material. Different elements produce different colored flames when placed in the fire of a bunsen burner.
The green color denotes the presence of the element boron b. This experiment is a modification of plastics analysis lab. Why were all of the metallic ions combined with the nitrate ion. In this laboratory activity, the characteristic color of light emitted for calcium, copper, lithium, potassium, sodium, and strontium will be observed. When heated, each element emits a characteristic pattern of light energies that is useful. Abstractin the flame test lab, the flame test was performed to excite the electrons in the samples and observe the color of the flame. After reading the two articles provided, write a report that addresses the question l1. Put a strontium and a copper splint into the flame at the same time and ask students to identify which metals are present. We test several chloride salts for their flame test colors. Flame test lab write up emission spectrum light scribd. Would a flame test work for positively identifying any metal. Finally, answer the questions and perform the exercises as indicated on your report form. Flame tests lab report free essay example studymoose. In this flame test experiment, seven different known solutions and three different unknown solutions were tested in a burner.
Using these flame tests, scientists can determine the identity of an element based on the unique color pattern released by an element. New and improved flame tests demonstration rainbow. This activity is called a flame test and its a real procedure used in labs. This taught us how the light is emitted, how each compound reacts differently, and the observations we made. Oct 10, 2012 we test several chloride salts for their flame test colors.
Atomic emission is utilized in everyday life in the laboratories of doctors and scientists. Immediately extinguish the qtip if it actually begins to burn. Students assessment will be based on the completion and accuracy of parts 14, as well as formal lab report using the provided outline and rubric title. These individuals use the spectrum to test for the presence of elements such as sodium, potassium, iron, etc the color that the unknown solution emits will determine what element the solution could posssibly be. Solution observed flame color estimated wavelength nm strontium chloride copper ii chloride potassium chloride unknown experiment conclusions write a lab report with the following information included. Have students individually answer the following questions, which are provided on the flame test worksheet. Place a small scoopful of each metallic solid in corresponding weighing dish. A metal salt is a compound of a metal and a nonmetal. Back in the 18th century, chemists began using flame tests to identify and distinguish elements. In this lab you will be given six unknown samples of metal.
Many elements produce flames of a characteristic color when they come in contact with the flame of the bunsen burner. Flame tests and atomic spectra experiment chemistry. The flame test lab showed us how different compounds react to heat and energy and what lights they emit. If chloride compounds are not available, metal nitrate compounds may be substituted. Just as a fingerprint is unique to each person, the. Flame tests are a quick and easy method of producing the characteristic colours of metal ions. Using a scoopula, place a small amount of the metal salt solution into a clean petri dish.
The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a bunsen burner. Students should record the color on their activity sheets and use the visible light spectrum chart to estimate the wavelength or frequency of each. These they will place into a flame in order to observe the colors produced. What is the difference between the white light spectrum and the spectrum from the fluorescent lights. Look for an unexpected color in portions of the flame. The heat of the flame excites the electrons of the metals ions, causing them to emit visible light. However, in order to complete this lab you will need to. Showing the nova film about fireworks titled fireworks. Flame test kit student laboratory kit introduction just as a fingerprint is unique to each person, the color of light emitted by metals heated in a flame is unique to each metal.
You will measure wavelengths of each sample and then use the speed of light equation to determine the unknown chemical. The heat test place approximately 100 ml of water in a 250ml beaker and heat to boiling. Dip the clean wire loop in a sample of one of the metals listed in the table and heat as demonstrated by your instructor. Flame test lab and the electromagnetic spectrum lesson. Conclusion the purpose of this lab was to see what colors are characteristic of particular metallic ions in a flame test and use. Flame tests of metal cations objectives the objectives of this lab are to. Test the remaining samples in the same way, each with its own wire loop. Closure strategies will occur next day due to time with a discussion and a short quiz. The secondary purpose of the lab was to identify unknown compounds that we would test and then guess as to what they were. Activity flame tests always wear goggles when working in the laboratory. What does the law of conservation of energy have to do with this type of experiment. Light the flame and place the boric acidcovered popsicle stick into the flame. Overview students will use small samples of 6 chloride salts of different metals. This lab attempted to prove that when electrons are excited and then calm, they emit a color specific to the element.
Flame test lab report free essay example studymoose. The characteristic colors observed are due to emitted electromagnetic radiation from the excited metal cations. We then determine the identity of two unknowns via flame test. This test showed that there is a direct coloration between the heat energy being expelled and the movement of electrons from one energy level to the next. The metal in the compound was identified by the light orange color seen during the flame test. Every element has a signature emission spectrum that can be used to differentiate between one element and another. Flame test lab report salt chemistry metals scribd. Metal salts contain loosely held electrons that are easily exited on. Repeat this test for each of the remaining plastic samples that did not give a green colored flame. Is it the metal or the nonmetal that produces the flame test color. Scribd is the worlds largest social reading and publishing site. After several tests for each solution it was determined that the accepted values for each solution, in order, were.
Student handout for flame test microsoft word 38kb aug2 09. The purpose of this lab was to allow us to observe compounds and how they react to an energy in different ways. Rinse each looped wire with distilled water after each use. Barrientes oct 26th 2015 the effects of different metals on the color in the flame. Hold the splint in the flame and record the color of the flame that is produced. Place the rinsed looped wire into the empty test tube provided. Also, i have produced a video suitable as an introduction to this lab. Lab procedure please print the worksheet for this lab. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Record the color of the flame when the wire loop first enters the flame. The emission spectra of gaseous elements can be observed by exciting the atoms in a gas filled tube with high voltage and viewing the light from the glowing gas with a spectroscope. To observe the characteristic colors produced by certain metallic ions when vaporized in. As the metal ion is heated by the flame, the electrons gain energy and move to outer orbitals.
The flame emits a color because each element has an exactly defined emission spectrum, which one can use to identify them. Many elements produce colors in the flame when heated. Also, learning how someone could use the spectrums of the elements to identify an unknown. You could readily identify the elements that had obvious colors different form all the others such as copper that gave off a bluegreen color and lithium that gave off a. Data table from the flowchart table of results consisting of identify your 2 unknowns dont forget the unknown numbers in tabular form. Please read the following section in lab equipment. When dissolved in water, the metal and nonmetal atoms separate into charged particles called ions. The flame test lab was an experiment designed to show how elements react when heated. How can atomic absorption and emission spectroscopy be used to identify various metal ions.
To perform flame tests of metal cations in order to observe their. Flame tests of metal cations california state university. Be creative when describing the colors, for example use nail polish or crayola crayon names. The flame test is a qualitative test used in chemistry to help determine the identity or possible identity of a metal or metalloid ion found in an ionic compound. This simple approach is often useful in identifying materials. The lab will be introduced with a powerpoint on the mechanics of the release of energy from the atom. Light the bunsen burner, purpose conclusion the purpose of this lab was to develop an activity series of the elements and to view the spectrum. To compare flame test colors produced by known ions in solution with those produced by unknown ions in solution. Flame test explain in complete sentences how to light the bunsen burner and how to properly use the gas jet and parts of the bunsen burner to achieve the optimal flame for your lab. In this lab, you will perform flame tests of several different metal cations.
Caution should be taken around open flames bunsen burner or propane torch. Flame test atomic emission and electron energy levels introduction. You may have seen it only briefly but it was there. Flame test click on the metal ions below to see the results of the flame test. Using an elements spectrum, learning how the electrons move around in the atom. Metal salts contain loosely held electrons that are easily exited on heating.
Your instructor will dip a looped wire into one of the solutions supplied, and then hold it in the bunsen burner flame. Flame test colorful elements experiments steve spangler. To determine the colours of the atomic emission spectra of several metallic ions by the flame test. For example, sodium makes the flame turn bright orange this is the same orange color made by sodium street lamps and many fireworks. It helps to dim the lights in your lab so the colors are easier to see. When the material is excited by placing it in a flame, the procedure is called a flame test. When the boric acid was in the flame, you probably notice a bright green portion of the flame. Have students write a lab report that includes the five criteria listed on the worksheet, and explained in the assessments section with answers. Flame test lab and the electromagnetic spectrum lesson plan, student version, teacher version and supplemental materials topic. Using your data, identify the metal ion in your unknown solution.
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