CSUN GENERAL CHEMISTRY-CHEM 101 L Experim? 9 Experiment 9: Atomic Emission Spect
ID: 1037760 • Letter: C
Question
CSUN GENERAL CHEMISTRY-CHEM 101 L Experim? 9 Experiment 9: Atomic Emission Spectra As you work through this exercise you will learn how to: " Account for the characteristic line spectrum for each element. Construct a calibration curve and interpolate using the equation for this curve. Calculate relative percent errors. Note: You should review electromagnetic radiation, line spectra and the electronic structure of atoms in your lecture notes before atempting this experiment. Much of the detailed information concerning the arrangements of electrons around the nuclei of atoms has been obtained by examining the light emitted when atoms of an element are excited upon the application of energy When the spectrum of this light is observed through a diffraction grating, only a few bright lines will be seen. These lines compose the atomic emission spectrum of the element being studied. Each line of the spectrum represents a definite wavelength of light emitted by the excited element. Light is a form of slectromagnetic radiation that results from the variation of an electromagnetic field generated by an oscillating electric charge. This radiation can be described as a transverse wave with a characteristic wavelength. In common with all wave phenomena, the wavelength, the frequency, and the velocity with which the disturbance travels are related by the equation: where à. is the wavelength [(m], c is the speed of light (c-3.00 x 10 ms), and v is the frequency [s or Hz]. In this experiment, we will be dealing with visible light, the wavelength of which spans about 400-700 nm (Table Table 9.1. Colors of Visible Light Wavelength range (nm) 380-420 420-440 440-470 470-500 500-520 520-550 Color violet violet-blue blue blue-green green yellow-green 63Explanation / Answer
Ans1. atomic emmision spectra obtained whent the etom get exposed to light of energy exactly equal to the difference in energy between to atomic anergy levels it absorbs that particular light and after nano second ot come back to groung energy state by emiting light having energy equal to absobs ligh and we record the particular wavelenght and get emision specra.
Ans.2. in this exeercise we need only wavlength otr frequency from the emmision spectra.
anss3. laman seroes correspont to transition from any higher exiced state to k shell which is most stablised in the atom so it reqire very high energy and this energy correspont to ultravoilet region.
Ans4. atomic emmision spectra are also known as fingureprint of atom sing each spectral line has unique wavelength sing energy gap between each energy state is different and unique.
Ans5. since In He atom nucleaus has 2 proton so electrns are tightly held by nucleaus as compared to hydrogen to the spectral lines shift towarda high energy side and it is yellow .