Instrumental Analysis ACS Exam Final With Complete Solutions 2024

Instrumental Analysis ACS Exam Final With Complete Solutions 2024 What is linear range? - answerAnalyte concentration over the response that is proportional to the concentration. When analyzing an unknown where should the concentration of the unknown fall? - answerSomewhere within the linear range What should you do if the unknown concentration is below the linear range? - answerperform pre-concentration Examples of pre-concentration - answerevaporating, anodic stripping voltammetry What should you do if the concentration of the unknown is greater than the linear range? - answerdilute the concentration so that it falls closer to the linear range What is the electromagnetic spectrum in order of increasing wavelength? - answergamma, x-rays, UV, visible light, IR, microwave, radio What is the electromagnetic spectrum in order of increasing frequency? - answerradio, microwave, IR, visible, UV, x-rays, gamma In what region of the electromagnetic spectrum is the resonant frequency of electrons in glass? - answerultraviolet More about regions (answer IDK) - answerIDK How do you calculate the concentration of a sample given a point calibration? (answer IDK) - answerIDK What are the common methods of atomization in atomic absorption? - answerflame atomization, electrothermal atomization, furnace atomization What type of sample can be used for flame atomization? - answerliquid What type of sample can be used for electrothermal atomization - answersolid and slurry What type of sample can be used for furnace atomization? - answersolid and slurry What are the pros and cons of using electrothermal atomization and/or furnace atomization compared to using flame atomization? - answerBoth offer a lower detection limit and can work with solid samples. However, both are slower due to heating-cooling cycles and are less precise making them less producible. Doppler effects - answeran observed change in the frequency of a wave when the source or observer is moving What is the light source of atomic absorption? - answerhallow cathode lamp What results in greater Doppler effect in flame atomization? - answerTemperature in flame is greater than that in hallow cathode lamp which means that flames also have wider spectral lines. This enables a greater doppler effect. What is the difference between hollow cathode lamp and flame? - answerHollow cathode lamp has narrower spectral lines than the spectral lines found in flames Spectral lines - answerThe wavelengths where a specific element can absorb or emit light Given the following information about the flame atomization below, name the fuel type that should be used. Oxidant *air* Temperature, °C ** - answernatural gas Given the following information about the flame atomization below, name the fuel type that should be used. Oxidant *oxygen* Temperature, °C ** - answernatural gas Given the following information about the flame atomization below, name the fuel type that should be used. Oxidant *air* Temperature, °C ** - answerhydrogen Given the following information about the flame atomization below, name the fuel type that should be used.