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Download Star Composition: Flame Testing Lab S-2
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Star Composition: Flame Test Lab Background Information: Astronomers analyze the white light from stars, which spread out into the colors of a spectrum. Dark bands appear in the spectrum caused by the absorption of the light by certain chemicals in the stars’ atmospheres. Each chemical has its own pattern of lines like a fingerprint. You will use a spectrograph to analyze chemical flames. 8th grade science standards: b. Students know that the Sun is one of many stars in the Milky Way galaxy and that stars may differ in size, temperature, and color. d. Students know that stars are the source of light for all bright objects in outer space and that the Moon and planets shine by reflected sunlight, not by their own light. e. Students know the appearance, general composition, relative position and size, and motion of objects in the solar system, including planets, planetary satellites, comets, and asteroids. Problem: What are the unknown chemicals composed of and how does this relate to star composition? Hypothesis: If scientists want to know what different stars are composed of, then… Materials: wire loop or paper clip paper, towels, small beaker of water, alcohol burner, spectroscope CaCl, CuCl, LiCl, SrCl, KCl, MnCl, NaCl, Cu2Cl2, CoCl2, NH4 Cl, AlCl3 Procedure: 1. Use paper clip to make a looped end wire. 2. Dip loop in chemical and hold in flame. 3. Write down the color of the flame. 4. Repeat while looking through a diffraction grating spectrometer. 5. Record the areas where you see a dark band or bands of color. 6. Dip loop in water and wipe clean. 7. Repeat the steps for all the chemicals. 8. Clean up and return all materials and equipment to proper place. Data: Substance (chemical formula) Observations of Chemical Color of Flame Diffraction Gradient using Spectroscope Calcium Chloride ________ Cuprous Chloride ________ Lithium Chloride _______ Strontium Chloride ______ Potassium Chloride _______ Manganese Chloride ______ Sodium Chloride ________ Cupric Chloride ________ Cobalt Chloride ________ Ammonium Chloride ______ Aluminum Chloride _______ Unknown # 1 Unknown # 2 Questions: 1) How do scientists know what different stars are composed of without visiting them? 2) What is the process called that astronomers use when viewing the colors given off by stars? 3) What are the 3 different types of galaxies? Conclusion:
