Understanding Light Interactions: A Lab Exploration of Spectra and Emission Lines, Summaries of Chemistry

Download Understanding Light Interactions: A Lab Exploration of Spectra and Emission Lines and more Summaries Chemistry in PDF only on Docsity! lOMoARcPSD|2805715 S. Tauhid, Chemical principles Sadaf Tauhid Chem 117: Section 2 Work Station 5, TA Daniela Graf Stillfried Lab Partners: Janet Bangura, Josseline Aupla Lab 3: Spectra Introduction: Electromagnetic radiation exists as a form of energy, that also exists as a photon. Photons are energy particles that are released during atomic processes, and through these particles, they act as waves that are wavelengths and frequencies. Light is put into categories based on its wavelength and frequencies. Each wavelength then has its own nm (nanometer) that can be used to classify it into visible and UV light. Frequency and wavelength are inverses because when frequency decreases then wavelength increases, and vice versa. Since electromagnetic radiation has different frequencies and wavelengths, they have different energies as well, that can be calculated using Planck’s constant. When gas-phase ions and atoms absorb light, it’s possible for the outermost valence electrons to be upgraded to a higher energy level. The emissions from an excited gas-phase atom can be seen through a spectroscope. This is used to diffract incoming light to the different wavelengths, which then distributes photons of the different energies across the two-dimensional plane. It’s also used to measure the energies of the emission lines. Data: Table 1 shows the different flame ionization test colors that were seen during the first part of the experiment, by naming the color seen for each of the different metals. Table 1. Flame Ionization Colors Metal Barium Calcium Cesium Lithium Potassium Sodium Color Green Orange Violet Red Purple Orange Unknown Flame Color Green Unknown Metal Barium Table 2.1 shows the wavelength center of the spectrum emitted by the incandescent light, given in nm. Table 2.1. Composition of Fluorescent Lamp Red Light Green Light Blue Light 650 nm 520 nm 470 nm Table 2.2. shows the wavelength center of the spectrum emitted by the mercury vapor tube, given in nm. Table 2.2. Composition of Mercury Tube