2 1. Why must the FID always be hotter than the GC column? A Keeping the GC column warm B. Inducing condensation C Burni

[answerhappygod]

2 1 Why Must The Fid Always Be Hotter Than The Gc Column A Keeping The Gc Column Warm B Inducing Condensation C Burni 1 (50.86 KiB) Viewed 90 times

2 1. Why must the FID always be hotter than the GC column? A Keeping the GC column warm B. Inducing condensation C Burning of the carrier gas. D. Preventing condensation E Evaporating the analytes. Which of the following statements about mass spectrometry is incorrec A The tallest peak is base peak (100%). B. The ions formed in a mass spectrometer are either singly charged or multiply charged C. Mass-to-charge ratio is the same as mass D. The atomie mass of one neutral carbon-12 atom is 12 daltons. E Soft ionization sources cause little fragmentation 3. Calculate the resolution that is needed to separate the lions [CHOT and [CH.N=1", with masses 60.05754 and 60.06884, respectively. A 1.063 x 10 B. 5.315 x 10 C 2.657 x 10 D. 5.315 x 10 E. 1.063 x 10 4. The mass spectrum of butyl methacrylate (M.W. 142 amu) from chemical ionization with the methane reagent is shown below. Which of the following statements is correct? 87 4500 Intensity (arbitrary units) 1500 143 69 115 127 61 81 100 180 120 100 140 miz A. The peak at m/z 143 is due to the presence of carbon-13 isotope. B. The peak at m/z 127 is due to the loss of an Ofrom m/z 143. C. The peak at m/z 87 is due to the loss of a C_02 group from m/z 143. D. All statements are incorrect. E. All statements are correct. 5. Which of the following statements about the van Deemter equation H = A + Blu + Cu is incorrect? A. The eddy diffusion term A is due to several paths through stationary phase. B. The longitudinal diffusion term Bis due to mass diffusion in mobile phase. C. The mass transfer term C is due to the slow rate of mass transfer within the stationary phase. D. An increase in the linear velocity of the mobile phase u will increase the mass transfer. E. An increase in the linear velocity of the mobile phase u will decrease the longitudinal diffusion.