demo-flametests-answerkey

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Chemistry

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Apr 3, 2024

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American Association of Chemistry Teachers |1-395 Name: ______________________ Flame Tests - “Rainbow Demonstration” Data Table Sample Data Student Observations May Vary * Compound Name Formula Metal Color Wavelength (nm) Frequency (THz) Barium Chloride BaCl 2 Ba Yellow-green 550 Calcium Chloride CaCl 2 Ca Orange-red 620 Copper II Chloride CuCl 2 Cu Green-blue 500 Lithium Chloride LiCl Li Red 700 Potassium Chloride KCl K Lavender-pink 750 Sodium Chloride NaCl Na Orange 480 Strontium Chloride SrCl 2 Sr Dark red 420 UNKNOWN #1 CuCl 2 Cu Green-blue 500 UNKNOWN #2 SrCl 2 Sr Dark red 420 Post Lab Calculations and Questions 1. Identify the two unknown metals based on the color of light they emitted: a. Unknown 1 Copper II Chloride b. Unknown 2 Strontium Chloride 2. Convert the wavelength of the following metals to meters (1nm = 1x10 -9 m). Then calculate the frequency of the light emitted and convert to THz (1THz = 1x10 12 Hz):
American Association of Chemistry Teachers |1-395 3. Convert the frequency of the following metals to Hz. Then calculate the wavelength of the light emitted, converting to nm: 4. When a glass rod is heated, a yellow-green flame is observed around the point where it is heated. What does the yellow flame indicate might be present in the glass? Barium 550nm 1x10 -9 m =5.5x10 -7 m = 3.0x10 8 m 5.5x10 14 Hz 1THz = 550THz 1nm s 5.5x10 -7 m 1x10 12 Hz Calcium 620nm 1x10 -9 m =6.2x10 -7 m = 3.0x10 8 m 4.8x10 14 Hz 1THz = 480THz 1nm s 6.2x10 -7 m 1x10 12 Hz Copper 500nm 1x10 -9 m =5.0x10 -7 m = 3.0x10 8 m 6.0x10 14 Hz 1THz = 600THz 1nm s 5.0x10 -7 m 1x10 12 Hz Lithium 700nm 1x10 -9 m =7.0x10 -7 m = 3.0x10 8 m 4.3x10 14 Hz 1THz = 430THz 1nm s 7.0x10 -7 m 1x10 12 Hz Unknown 1 500nm 1x10 -9 m =5.0x10 -7 m = 3.0x10 8 m 6.0x10 14 Hz 1THz = 600THz 1nm s 5.0x10 -7 m 1x10 12 Hz Potassium 750THz 1x10 12 Hz =7.5x10 14 Hz = 3.0x10 8 m s 4.0x10 -7 m 1nm = 400nm 1THz s 7.5x10 14 1x10 -9 m Sodium 480THz 1x10 12 Hz =4.8x10 14 Hz = 3.0x10 8 m s 6.3x10 -7 m 1nm = 630nm 1THz s 4.8x10 14 1x10 -9 m Strontium 420THz 1x10 12 Hz =4.2x10 14 Hz = 3.0x10 8 m s 7.1x10 -7 m 1nm = 710nm 1THz s 4.2x10 14 1x10 -9 m Unknown 2 420THz 1x10 12 Hz =4.2x10 14 Hz = 3.0x10 8 m s 7.1x10 -7 m 1nm = 710nm 1THz s 4.2x10 14 1x10 -9 m
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