University:
University of California, Berkeley
Course:
CHEM 1A | General Chemistry
Academic year:

2024
Views:

56

Pages:

2
Author:

zetaStertSona8zf

Flame Test Lab 1. What is white light?: A continuous spectrum in which all wavelengths of visible light are present 2. Equation describing the energy of a photon: E = hv (Plank's constant * frequency) h = 6.6262 +10 ^-34 J s 3. The difference in energies between two levels is emitted in the form of:: Photon of electromagnetic radiation 4. The measurement of white light: Between 400 and 700 nm 4*10^-7 --> 7 *10^-7 5. Metals or nonmetals have loosely held electrons?: Metals 6. What is the color of the flame a combo of?: Combo of wavelength of each transition and may be used to determine the identity of an ion 7. How is a colored flame produced?: The emission of energy in the visible portion of the spectrum as those electrons return to lower energy levels 8. What does a flame test indicate about the energy changes taking place among the electrons in a metallic ion?: Indicate the specific energy change occurring in the ion 9. Why does a metallic ion produce a characteristic color in a flame test, regardless, of the compound used as the source of the ion?: Only cation's/metal loosely held electrons we witness become excited, we are witnessing the energy changes in the ion, doesn't matter what compound it is 10. Which color has the shortest, then longest wavelength?: Shortest- Violet Longest- Red 11. What is chalk made up of?: Calcium carbonate CaCO3 12. What salt is pale yellow?: Barium Nitrate 13. What salt is green?: Copper (2) Chloride 14. What salt is dark red?: Lithium Nitrate 15. What color is Potassium Nitrate?: Peach 16. What color is Sodium Chloride?: Bright yellow 17. What salt is an orangey color?: Calcium Chloride 18. What salt is light red?: Strontium Nitrate 19. What color is Copper (2) Chloride?: Green 20. What color is Lithium Nitrate?: Dark Red 21. What color is Barium Nitrate?: Pale Yellow 22. What salt is a peach color?: Potassium Nitrate 23. What salt is bright yellow?: Sodium Chloride 24. What color is Strontium Nitrate?: Light red 25. What is the process that produces the colors seen in the flame tests?: The atom starts in the ground state, we add energy to the atom with the bunsen burner. The atom absorbs the energy and electrons jump to higher discrete energy levels. 1/2 Electrons quickly return to ground state, emitting a discrete amount of energy as a photon of light 26. How does cross contamination ruin the results of the experiment?: Each ion produces its own color due to the energy level changes in that ion, cross contamination would give us a mixture of colors 27. What is the relationship of the colors you see and the lines of the electromagnetic spectrum produced by the metals?: The colors we see were a combo of the lines of the visible spectrum produced by the metals 28. When a glass rod is heated, a yellow flame is produced, what does it indicate?: The bright yellow flame indicates there are sodium compounds used in the making of glass ; 75% SiO2, 25% NaO2 and CaO 29. Equation to figure out the energy of a photon with a wavelength given?: E = hc/lambda 30. What other equipment could be used in this experiment without burners?: A lighter(spark/energy) and anything flammable (alcohol) 31. How are metallic salts used in fireworks?: Salts are heated (producing excited state atoms) when the atoms return to ground state they produce colors 2/2