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- This nanomaterials engineering lesson introduces practical applications for nanotechnology and some scientific principles relate High School Lesson Pre-Req Knowledge Information about the electromagnetic spectrum and the Grand Challenge for this...
- Then, we will build on this information to study how the energy of ultraviolet radiation can cause cancer in humans and how that same kind of energy can, in turn, be used to treat cancer. We will also practice the important skill of making solutions...
- Photons outside the visible spectrum may also be emitted, but we cannot see them. Remember that ultraviolet follows violet as the spectrum increases in energy. Chemical engineers use this low-tech and very reliable flame test to identify an element based on the color it emits when placed in a flame. The arrangement of electrons in an atom determines the sizes of the quantum jumps, and thus the energy and colors of photons emitted. In this lab, we will prepare. We will test the solutions to identify the distinct color each metal ion produces when placed in a Bunsen burner flame. Then we will calculate the approximate frequency and energy of each wavelength of visible light.
- With what we learn from this collected data, we will identify the metal in a solution of unknown identity. Either print color copies one per group or display in the classroom the Figure 1 color scale to help students identify wavelengths based on flame color. Figure 1. The visible light spectrum and corresponding colors-to-wavelengths in nanometers nm. Just before the activity begins, pour out the water and rinse the splints with clean water. Choose one of the three chemicals to use for the "unknown solution. Label the beaker with masking tape and a marker as "unknown solution. With the Students Hand out the worksheets and give students a few minutes to answer the pre-lab questions also listed in the Assessment section, with answers , which includes their calculations of how much of three chemicals are needed to make three specific molarity solutions for the lab. Divide the class into groups of two or three students each.
- Have each group prepare the ml each of. Add one of the chemicals such as the strontium chloride little by little using a clean spoon until the mass shown by the electronic balance is equal to the mass, in grams, of the chemical needed, calculated in question 4 of the worksheet pre-lab questions. Lift up the paper carefully with the appropriate quantity of the chemical and pour the chemical into a clean ml beaker.
- Use the graduated cylinder to measure ml of distilled water and add the water to the ml beaker. Stir the beaker contents with the spoon used earlier to add the chemical to the electronic balance. Label the beaker by placing a piece of masking tape on the beaker and using a marker to write the name of the chemical used to make the solution. Discard the spoon and paper. Do not reuse them when making the other chemical solutions because they will contaminate the solutions. Repeat these steps to make solutions with the two remaining chemicals. Let two wooden splints soak in each solution for 10 minutes. Suggested procedure: Have each group make one solution at a time, then add the wooden splint to the solution, and then make the next solution while the splint soaks. Light the Bunsen burner with a lit match and adjust it to produce a moderately sized flame. Place the soaked end of the wooden splint into the hottest part of the Bunsen burner flame the top of the inner cone.
- Record the observed flame color. Determine the approximate wavelength of the visible light corresponding with each observed flame color. Have students refer to Figure 1 to identify the wavelength based on the flame color. Remind students that the unit of length for wavelengths is nanometers nm. Place a wooden splint soaked with the unknown solution in the Bunsen burner flame. Record the color and identify the metal ion in the solution, based on previous data collection results. Have students write a lab report that includes the five criteria listed on the worksheet, and explained in the Assessments section with answers. Review their worksheet answers to gauge their comprehension. List the electromagnetic spectrum from lowest to highest energy. Answer: Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays, gamma rays.
- Of visible light, what color is lowest in energy? What is highest? Answer: Lowest energy of visible light is red; highest energy of visible light is violet. List all the cations and anions with charges present in this lab. Perform the appropriate calculations for preparation of the three solutions: ml of. Answer: In order to prepare the solutions, students must determine how many grams of each compound must be added to ml of distilled water to create the appropriate molarity solution.
- Refer to Figure 2 for the answer. Figure 2. The molarity calculations for making the experimental solutions. Activity Embedded Assessment Experiment Conclusions: As directed in the Flame Test Worksheet , have students write typed lab reports that include the following information. If students do not finish within the class period, have them complete the assignment as homework to submit the following class period. Review their answers to assess their comprehension. Is it the metal or the non-metal that produces the flame test color? What brought you to this conclusion? Answer: Flame tests show the color of the metal, or the positive ion [cation] in the chemical solution. Expect students to be able to come to this realization because the three chemicals had different metal atoms, but they all had the same non-metal anion, chloride. The identity of the unknown it is one of the metals you tested The answer depends on which chemical the teacher chose to use for the "unknown solution.
- Calculations shown in Figure 2. Calculate the approximate frequency of energy given off by the emitting element in each of the three solutions. Answers: Students should first estimate the wavelength of light produced when each solution burns, based on comparing the color of the flame to an image of the visible light spectrum, such as Figure 1. Expect students to approximate the following wavelengths: for strontium chloride: around nm; for copper II chloride: around nm; and potassium chloride: around nm. How does the flame test investigation relate to the engineering design process?
- Answer: The flame test is part of the research phase of the engineering design process, which is important so that engineers understand all of the science and math involved in the problem they are trying to solve. Post-Activity Assessment Going Further: As directed in the Flame Test Worksheet , have students answer the following problem on a separate sheet of paper: The energy you observed was given off in the visible light range. Where is ultraviolet light on the electromagnetic spectrum? Does it still contain energy even though it is not in the visible light range? Support your answer. Answer: Ultraviolet light is next to violet visible light on the electromagnetic spectrum. This means that it has a smaller wavelength than violet light, a higher frequency, and thus contains more energy than violet light, as well as all other colors of visible light.
- Safety Issues The lab work in this activity requires the use of Bunsen burners, and thus open flames. School and class policies vary on the use of open flames. Adjust the procedures accordingly, for example, if only adults are permitted to work with open flames. Some of the chemicals can cause skin and eye irritation, and are hazardous if ingested. Have students wear safety goggles, lab coats and gloves while conducting the activity.
- Contact Us Many are involved with research. The flame turned brick-orange again, and the AgNO3 test left a precipitate. Question: Another purpose was to understand how fireworks work. Various elements burn with different colored flames. Unknown A For example, sodium makes the flame turn bright orange — this is the same orange color made by sodium street lamps and many fireworks. 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. Reaction with KMnO4. The characteristic colors observed are due to emitted electromagnetic radiation from the excited metal cations. Theoretical background: Flame tests are a quick and easy method of producing the characteristic colours of metal ions. Purpose The purpose of this lab was to reinforce the examination of wavelengths in photons discharged from atoms as they move from high energy to low energy, atomic emmision.
- 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. Question: When a compound is placed in the flame of a burner, what happens to the color of the flame? The Calcium had a wavelength of nm. Gallery of Flame Test Lab. Hydrochloric Acid 4 Pages. Introduction Comments. Paper What colours are produced when different metallic compounds are placed in a flame, and why this happens? When metal salts ionic compounds are heated in a Bunsen burner flame, the metal gives off a characteristic color. Label the test tubes with the names of the solutions and unknowns. Not all metal ions give flame colours. Learning the basics of the fire such as, the products of flame, requirements for a flame, characteristics of a flame, etc. These reports can include all sorts of details about your sample, including the outcomes of a blood test, the analysis of a urine sample or a sample of saliva.
5: Flame Tests And Atomic Spectra (Experiment) - Chemistry LibreTexts
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 Test Lab Report conclusion questions? Conclusion: As we observed the different characteristics of the flame, One way in which to use the flame test is to tell what chemical is burning at a chemical plant that is caught on fire, the firefighters are then able to fight against it with the correct resources.Question And Answers From The Past | Chem13 News Magazine | University Of Waterloo
Using Flame Test Lab Report. The colors produced by the flame test are compared to known standards. The purpose of having the Laboratory Report is to assist education researchers as well as others who might be conducting education research study in their laboratories and doing the analysis of the outcomes. Look for an unexpected color in portions of the flame. Don't forget to rate and comment if you interest with this lab report sample. Strontium Nitrate It helps to dim the lights in your lab so the colors are easier to see.- Test all of the test sticks and make sure that you record the color of the flame for each element on the Data Table. Spectroscope Campers experiment for at the public and flame tests in a handled we use to offer testing have listed all the flame. Record any change in the color of the solution and the litmus paper. The purpose of this lab is to investigate atomic absorption and emission spectroscopy through the use of flame tests. Copper Nitrate All that you need to do is to have access to this site to gain access to this totally free service, however if you need to have a more in depth appearance, then you will be needed to make a monthly payment.
Flame Test Atomic Emission And Electron Energy Levels Lab Answers
If you are trying to find the current reports, or if you want to acquire the initial report, then you require to find the Lab Report Download website. If you want to remove them to write in your notebook you may sit at a table in the center of the room. Conclusion: As we observed the different characteristics of the flame, and the properties of the element before and after it became a flame, we found many distinguishing traits for each element.- Na2SO4 You can go back to the site as frequently as you like without any problems, and you will not be charged any charges when you do. Powered by Create your own unique website with customizable templates. Hi, I'm usually really bad at writing conclusions for labs, but I really need help with this one. Premium Lithium Nitrate Hypothesis If the element independent variable is placed in the fire controlled variable , then the 3. Which part of an ionic compound is producing the visible flame- the cation metal or the anion non-metal 2. Do you think that flame tests would be valuable for detecting ions present in a mixture of several ionic compounds? Ion, Atom, Sodium chloride Words Also, learning how someone could use the spectrums of the elements to identify an unknown.
- You should always have access to the current reports and the online version is constantly free from charges. Academic year. Metal salts contain loosely held electrons that are easily exited on … Every element has a signature emission spectrum that can be used to differentiate between one element and another. The flame test is a procedure used by chemists to identify the presence of specified metal ions, based on the color the flame that appears along with it when it's heated. Commit it for only flame test lab conclusion of steel essay on conclusion. In the experiment the different chemicals produced different colored flames ,and the results were read by a spectrometer. Period 2 Introduction to the Flame Test Lab: The Flame Test lab was an in-class lab where we tested chemicals in the flames to see the wide range of colors in the color spectrum.
- The Cu turned the flame a green color. Procedure: 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. Sodium Chloride Another purpose is to understand how fireworks work. The color of flames in general also depends on temperature.
- What colours are produced when different metallic compounds are placed in a. Students will record the dominant flame color observed. Potassium Nitrate Cole Chemistry Introduction: Back in the 18th century, chemists began using flame tests to identify and distinguish elements. Flame Tests These studies are very helpful in determining an unknown element, given the fact that all elements burn a different color.
- Sodium Chloride Please consider supporting us by disabling your ad blocker. A flame test is a procedure used to test quantitatively for the presence of certain metals in a chemical compounds. Wan Huang 27 Dec, Free Essays, Data Conclusion 1. With this in mind, you do not need to fret about being in the exact same situation once again. In this lab, you will perform flame tests of several different metal cations. Once the wire is clean, dip it into one of the solutions, place the wire in the flame, and observe the color of the flame. Move the flame under the stick to find the best color. The Copper had a wavelength of nm. Intro: Flame test is fast and easy to perform. In this lab you will be given six unknown samples of metal Hypothesis: When the compound is placed in the flame, the flame changes color depending on the chemical compound. This Lab attempted to prove that when electrons are excited and then calm, they emit a color specific to the element.
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