University:
Arizona State University
Course:
CHM 101 | Introductory Chemistry
Academic year:

2024
Views:

178

Pages:

1
Author:

Cyncuncewc3b4

Flame Test Lab What is white light? A continuous spectrum in which all wavelengths of visible light are present Equation describing the energy of a photon E = hv (Plank's constant * frequency) h = 6.6262 +10 ^-34 J s The difference in energies between two levels is emitted in the form of: Photon of electromagnetic radiation The measurement of white light Between 400 and 700 nm 4*10^-7 --> 7 *10^-7 Metals or nonmetals have loosely held electrons? Metals 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 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 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 Only cation's/metal loosely held electrons we witness become Why does a metallic ion produce a characteristic color in a flame excited, we are witnessing the energy changes in the ion, doesn't test, regardless, of the compound used as the source of the ion? matter what compound it is Which color has the shortest, then longest wavelength? Shortest- Violet Longest- Red What is chalk made up of? Calcium carbonate CaCO3 What salt is pale yellow? Barium Nitrate What salt is green? Copper (2) Chloride What salt is dark red? Lithium Nitrate What color is Potassium Nitrate? Peach What color is Sodium Chloride? Bright yellow What salt is an orangey color? Calcium Chloride What salt is light red? Strontium Nitrate What color is Copper (2) Chloride? Green What color is Lithium Nitrate? Dark Red What color is Barium Nitrate? Pale Yellow What salt is a peach color? Potassium Nitrate What salt is bright yellow? Sodium Chloride What color is Strontium Nitrate? Light red 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. Electrons quickly return to ground state, emitting a discrete amount of energy as a photon of light 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 What is the relationship of the colors you see and the lines of the The colors we see were a combo of the lines of the visible specelectromagnetic spectrum produced by the metals? trum produced by the metals When a glass rod is heated, a yellow flame is produced, what does The bright yellow flame indicates there are sodium compounds it indicate? used in the making of glass ; 75% SiO2, 25% NaO2 and CaO Equation to figure out the energy of a photon with a wavelength given? E = hc/lambda What other equipment could be used in this experiment without burners? A lighter(spark/energy) and anything flammable (alcohol) How are metallic salts used in fireworks? Salts are heated (producing excited state atoms) when the atoms return to ground state they produce colors