Steve spangler science has been performing and explaining the mentos soda geyser. The flame test, a safer version of the rainbow demonstration. To do a flame test on a metallic element, the metal is first dissolved in a solution and the solution is then held in the hot, blue flame of a bunsen burner. Activity flame tests always wear goggles when working in the laboratory.
Rinse each looped wire with distilled water after each use. Closure strategies will occur next day due to time with a discussion and a short quiz. In this most stable energy state, all electrons are in the. Your lab report should include title, a complete statement of the purpose, procedure followed to perform a flame test, materials used, data table of results, and conclusions.
The purpose of this lab was to observe the color and characteristics of certain substances during a flame test. These they will place into a flame in order to observe the colors produced. Here is one students flame test cartoon that was used by the student to discuss the procedure for the lab. The flame test is a safer version of the traditional rainbow demonstration, an exercise popularly conducted in chemistry classrooms. Place the rinsed looped wire into the empty test tube provided.
Flame test electrons, lightthis is a much easier way to do the flame test lab experiment. Oct 10, 2012 we test several chloride salts for their flame test colors. Change to a blue flame by opening the air hole and start the stopwatch. When you have finished testing your seven metallic ion solutions, obtain a sample. Simple instruction sheet for conducting flame tests.
To become familiar with the transfer of energy in the form of quantum, students perform flame tests, which is one way chemical engineers identify elementsby observing the color emitted when placed in a flame. To fully understand the possible risks associated with any lab or. This enlightening activity then motivates them to work through the mathematics and makes the metallic ion version of the flame testing lab later in the unit even better. Perform flame tests of metal cations in order to observe their characteristic colors, perform calculations to. In this lab, students will investigate the colors produced when several mixtures of metallic ions are placed in a flame. 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. 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 will record the dominant flame color observed. The reason each of the elements produced a different color or series of wavelengths is because of the make up of the atom.
The flame test is easy to perform and does not require special equipment, but there are drawbacks to using the test. If students do not finish within the class period, have them complete the assignment as homework to submit the following class period. Do not knock over the flame, reach over it, or clutter your lab area with paper. The green color denotes the presence of the element boron b. Flame tests using metal salts resource rsc education. Flame tests are used to identify the presence of a relatively. For other metals, there are usually other easy methods that are more reliable but the flame test can give a useful hint as to where to look. Atomic emission and electron energy levelschemtopic lab activity, the. Mar 08, 2017 the students will work in lab groups of three to four students to construct meaning on the causes of various light emissions from the following 0.
When the boric acid was in the flame, you probably notice a bright green. Ion flame test inquiry lab household materials by dunigan. This test works well for metal ions, and was perfected by robert bunsen 1811 1899. 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. Flame test lab lesson plan for 9th 12th grade lesson. Student handout for flame test microsoft word 38kb aug2 09. The responding variable was the color of the flame. The importance of laboratory safety in the classroom pdf. Burning metals reveal their identities with awesome colours. The purpose of the flame test is to demonstrate to students the variety of colors produced when different metals or salts meet a flame. The purpose of this activity is to observe the visible spectra of specific metal cations, develop a hypothesis about the effect of chemical environment on the spectra and to propose possible extended experiments for further study. Flame test lab chemists began studying colored flames in the 18th century and soon used flame tests to distinguish between some elements.
The test is intended to help identify a pure sample. In this activity, you will investigate the colors of flame produced by solutions of metal salts. Many elements produce flames of a characteristic color when they come in contact with the flame of the bunsen. This lab is designed much like a boxed microchem lab. The metal in the compound was identified by the light orange color seen during the flame test. Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. The purpose of the lab is to observe the characteristic colors produced by certain metallic ions when vaporized in a flame. In conducting the flame test, we simply take a sample of the substance, using a platinum wire and place it in a hot flame we then observe the color. This activity is called a flame test and its a real procedure used in labs. You may have seen it only briefly but it was there.
Be creative when describing the colors, for example use nail polish or crayola crayon names. The heat of the flame excites the electrons of the metals ions, causing them to emit visible light. The methanol handler would pour 5 drops of methanol into the watch glass along with the test substance and combine by gently stirring. The lab will be introduced with a powerpoint on the mechanics of the release of energy from the atom. In this flame test experiment, seven different known solutions and three different unknown solutions were tested in a burner. The students will work in lab groups of three to four students to construct meaning on the causes of various light emissions from the following 0. When the boric acid was in the flame, you probably notice a bright green portion of the flame. Many metallic ions exhibit characteristic colors when vaporized in the burner flame. Flame test photographs, listed from top left to bottom right. If chloride compounds are not available, metal nitrate compounds may be substituted. To identify atoms in solutions using the colors they emit when heated. They can only be used to identify the metal present. Hard candies are known for their bright colors, delicious tastes.
Overview students will use small samples of 6 chloride salts of different metals. Flame tests chemistry laboratory kit, students observe the characteristic color of light emitted by metallic salts when placed in a flame. Flame tests and atomic spectra experiment chemistry. Use the platinum rod as before to test the unknown metal compound. The purpose of this activity is to determine which of the ions in a series of ionic compounds the cation or the anion is responsible for the colors in a simple flame test. Test the remaining samples in the same way, each with its own wire loop. With the flame tests chemistry laboratory kit, students observe the characteristic color of light emitted by metallic salts when placed in a flame. 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 bright red color.
When youre used to the everyday colors of flames, colorful changes like these can be. Your instructor will dip a looped wire into one of the solutions supplied, and then hold it in the bunsen burner flame. To become familiar with the transfer of energy in the form of quantum, students perform flame tests, which is one way chemical engineers identify elementsby observing the color emitted when placed in. Purpose to observe the characteristic colors produced by certain metallic ions when vaporized in a flame. This page describes how to perform a flame test for a range of metal ions, and briefly discusses how the flame color arises. Activity flame test worksheet 2 materials calculator graduated cylinder 3 400ml beakers 100 ml. One inherent weakness of the flame test is that color is a subjective experience. When the compound to be studied is excited by heating it in a flame, the metal ions will begin to emit light. Different elements produce different colored flames when they. This flame test lab is always a favorite of mine, and a much loved lab by all of my students. The entire report should stand alone, meaning the reader should not have to see this instruction sheet to make sense of it. Learn vocabulary, terms, and more with flashcards, games, and other study tools. In the instance of the popsicle flame, the three necessary components are present during the initial lighting of the fire.
Hold the splint in the flame and record the color of the flame that is produced. This activity introduces students to flame test techniques in an. What is the flame test and what are its applications. The identification of an unknown will also be performed by means of its own flame test. Its purpose is to identify specific elements in a material. Usually most experiments have you use a nichrome wire and acid cleaning each time a new test is to be completed. Also includes two slides that can be used to cut up as part of a starter activity that gets students to put the instructions in the correct order. The stile lab handbook has been designed to provide you with a simple, easytouse overview of. Students use the flame test cartoon graphic organizer so that they are using a common format, which will make discussing the procedure easier. Flame test lab objective in this lab students will learn about atomic energy levels, emission spectroscopy, and flame tests for element identification. Using these flame tests, scientists can determine the identity of an element based on the unique color pattern released by an element.
A flame test is a procedure used to test qualitatively for the presence of certain metals in chemical compounds. Activityflame test worksheet 2 materials calculator graduated cylinder 3 400ml beakers 100 ml. The reason each of the elements produced a different color. Using your data, identify the metal ion in your unknown solution. Conclusion the purpose of this lab was to see what colors are. Shironakaflame testlab report by nick shironaka on prezi. This page describes how to do a flame test for a range of metal ions, and briefly describes how the flame colour arises. Other tests have to be used to identify the negative ions present.
Measure 21 ml of yellow water and pour it into test tube c. Just like fingerprints, the color of light emitted by an element heated in a flame is unique to each element. We can use flame tests as a method of analysis, although, on their own, they will not identify a compound completely. Students test various chemical compounds with a flame test and test an unknown compound. After several tests for each solution it was determined that the accepted values for each solution, in order, were. This basic lab activity is ideal for physical science and introductory chemistry classes. After calculating and then preparing specific molarity solutions of strontium chloride, copper ii chloride and potassium chloride good practice. To clean the wire, dip it into the test tube of 1m of hcl and heat the wire in the hottest part of the flame until no color shows. The flame was orange at the end of each test because the wood splint started burning. The best time to use this lab is when teaching the following concepts. This activity is designed for secondary age students but could be used with upper. How prezi does project status updates with a distributed workplace.
The flame test lab was an inclass lab where we tested chemicals in the flames to. This basic lab activity is ideal for physical science and. There is a lot of disagreement on the web and in the books i have looked at about the flame colour given by caesium compounds, and i have never actually done this myself in the lab. Flame test colorful elements experiments steve spangler. Immediately extinguish the qtip if it actually begins to burn.
Atomic emission and electron energy levelschemtopic lab activity, the characteristic colors of light emitted by various metal ions will be observed and used to identify an unknown metal ion. With my method, it will take you only half as much time to complete the lab. Light the bunsen burner, purpose conclusion the purpose of this lab. Record the color of the flame when the wire loop first enters the flame. For group 1 compounds, flame tests are usually by far the easiest way of identifying which metal you have got. Because i want students to work with the speed of light formula as part of their lab writeup i make sure that i name the element.
Many elements produce flames of a characteristic color when they come in contact with the flame of the bunsen burner. Results name of compound flame colour sodium carbonate potassium carbonate lithium chloride 4. The heat generates from a separate flame, the lighter. In this classic science experiment, students report on the colours produced when flame tests are carried out on different metal salts. The purpose of this activity is to observe the visible spectra of specific metal cations, develop a hypothesis about the effect of. As directed in the flame test worksheet, have students write typed lab reports that include the following information. 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. We then determine the identity of two unknowns via flame test. Aims to identify metals by the colours they produce in a bunsen flame. This flame test lab lesson plan is suitable for 9th 12th grade. Take a wooden split of the metallic ion solutions insert into flame. Explain how light is released in the form of color using the bohr model.
83 122 1094 1552 1293 435 979 702 1411 383 1480 1557 532 1396 176 1236 33 471 318 1277 1046 1143 1309 1036 1003 744 1582 469 562 1232 608 142 532 353 560 1195 506