CHEM 210 Test 3 Questions with Correct Answers

CHEM 210 Test 3 Questions with Correct Answers Where Beer's Law Fails - Answer-1. If what is measured has equilibrium shifts 2. With high reflection (worse when concentration is high) 3. When path length isn't constant (there are multiples) 4. When the extinction coefficient isn't constant (there is polychromatic light) 5. When Stray light can be reflected What is the main advantage of double-beam instruments over single-beam instruments? - Answer-You don't have to calibrate the double-beam instrument for every wavelength change Equation for Linear Vibration Modes - Answer-3N-5 (for non-linear, it is 3N-6) ICP-AE Disadvantages - Answer-1. Ar+ Emission Interference 2. More expensive to purchase AND operate ICP-AE Advantages - Answer-1. Inert Atmosphere 2. Built-in electron "ionization buffer" 3. High temperature breaks down molecules 4. Rapid multi-element analysis As energy increases, does wavelength increase or decrease? - Answer-decreases Types of Absorption - Answer-1. Electronic Transitions 2. Rotational Transitions 3. Vibrational Transitions Rotation Wavelength - Answer-Microwave Vibration wavelength - Answer-Infrared