YOU WERE LOOKING FOR: Flame Test Pre Lab Answers
What physical change happens to atoms and molecules in a solution that is strongly heated in a flame? Is there a phase change? If so, what is it? What is going on inside atoms of a metal when atoms of that metal are placed in a hot flame? Describe...
January 7, by 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. Hence, the competitors need to practice the online tests related to the topic...
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Flame Test Lab: 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 secondary purpose of the lab was to identify unknown compounds that we would test and then guess as to what they were. The Flame Test lab was done in several parts. The first one that I will focus on is the Pre Lab questions: Pre Lab questions: This is a replication of the article used in the pre lab: Introduction By placing atoms of a metal into a flame, electrons can be induced to absorb energy and jump to an excited energy state, a quantum jump. They then return to their ground state by emitting a photon of light the law of conservation of energy indicates that the photon emitted will contain the same amount of energy as that absorbed in the quantum jump.
The amount of energy in the photon determines its color; red for the lowest energy of visible light, increasing energy through the rainbow of orange, yellow, green, blue, indigo, and finally violet for the highest energy of visible light. Photons outside the visible spectrum may also be emitted, but we cannot see them. The arrangement of electrons in an atom determines the sizes of the quantum jumps, and thus the energy and colors of the collection of photons emitted, known as emission spectrum. In this way the emission spectrum serves as a "fingerprint" of the element to which the atoms belong.
We can view the emission spectrum of colors all at once with the naked eye. It will appear to be one color, which we will carefully describe. A flame test is a procedure used to test quantitatively for the presence of certain metals in a chemical compounds. When the compound to be studied is excited by heating it in a flame, the metal ions will begin to emit light.
Based on the emission spectrum of the element, the compound will turn the flame a characteristic color. This technique of using certain chemical compounds to color flames is widely used in pyrotechnics to produce the range of colors seen in a fireworks display. In this lab, we will record the flame test color of several metals by making solutions of salts, or ionic compounds, of those metals then igniting them with a match. We will observe the separate colors of the emission spectra, as the solution burns. If time permits, we will also compare the flame tests of crystals of a compound with that of a solution of the same compound.
Background: The electrons in an atom occupy different energy levels, as you know. When all of the electrons are at the lowest possible energy level they are said to be in the ground state. Electrons do not always stay in the ground state. Sometimes they can be promoted to a higher-energy electron shell. This can happen in two ways. First, the electron can absorb a photon of just the right amount of energy to move it from one quantum shell to another. Second, when atoms are heated their electrons can gain energy from the heat. This promotes them to the higher-energy shell. When an electron is in a higher-energy shell it is said to be in an excited state.
Electrons in excited states do not usually stay in them for very long. When electrons lose their energy they do so by emitting a photon of light. Photons are particles with energy but no mass. The photons emitted precisely match the quantum energy difference between the excited state and the ground state. For different elements the spacing between the ground state and the higher energy levels is different.
This gives rise to a way to uniquely identify elements based on their spectrum. A spectrum is the scientific name for a rainbow: light broken into the different wavelengths that make it up. Pre lab Questions: Submit your answers to these questions on a separate sheet of paper if more room is needed before you begin the lab. What color of light is the lowest in energy? Red has the lowest amount of visible light energy. What color of light is the highest in energy?
Violet has the highest amount of visible light energy. What color of light has the highest frequency? Violet has the highest frequency because the amount of energy is directly proportional to the frequency. What color of light has the lowest frequency? Red has the lowest frequency because it is directly proportional to the energy amount. How are electrons "excited"? When atoms are heated their electrons gain energy from the heat.
What does it mean when the electrons are "excited"? It means that they are in a higher energy state. If you test 2 solutions and find that they both produce a red flame, how can you determine for sure whether they contain the same metal? Different elements have different spacing between their ground state and higher energy state. This gives a way to identify elements by their spectrum. In your own words, write a short explanation of how an electron absorbs energy and re-emits it as light and why different elements have different spectra. Electrons absorb energy and become excited and re-emit it by shooting a photon out to lose their energy. Flame Test Lab Purpose Observe the characteristic colors produced by certain metallic ions when vaporized in a flame. Identify unknown metallic ions by means of its flame test. Materials 5 watch glasses, clean and dried 1 glass dropper 1 thin glass stir rod this glass stir rod is very delicate, please handle gently!
Influencer Program high school flame test lab answers Platinum has a high melting point - it will not melt in a Bunsen flame. You may have seen it only briefly but it was there. I then ask students to read over the questions in the Flame Test post-Lab Write Questions to see if they have any questions about the post-lab work. When the boric acid was in the flame, you probably notice a bright green portion of the flame. So I did a chemistry lab today and one part of the lab required us to perform a flame test. Calculate the wavelength of light given its frequency. The purpose of this lab was to observe the characteristic colors produced by certain metallic ions when vaporized in a flame. The energy difference between the high energy level and the low energy level is related to the frequency color of the emitted light. Using your data, identify the metal ion in your unknown solution.
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