18. The column a) In normal phase, if analyte polarity increase then it will be faster c) If particle size increase then # plates decrease e) All f) None b) If column length increase then # plates decrease d) In reversed phase, if analyte polarity increase then it will be slower
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- From the data calculate: a) retention factor of each solute b) selectivity factor c) how many plates are needed to provide a resolution of 1.5? d)how long a column is needed if the plate height of the packing is 1.5x10^-3cm? e)if the flow rate is 6.75 cm/min how long will it take to elite the two species?At what distances do hydrogen bonding, hydrophobic interactions and charge transfer interactions act to dominate the interactions between particles when at the isoelectric point? The options are Short range or Long range.Using the regression equation below, calculate the molar absorptivity with 1cm path length y= 0.0068x-0.0026
- 1) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500. Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).In a microemulsion, effectively all of the surfactant resides at the interface between the phases present. Describe how this is different to an aqueous surfactant solution at concentrations above and below the cmc.Q4 (a) Analyze the importance of dropping mercury electrode on polarography. (b) (i) Calculate the molarity of MgSO4 in a solution containing 1.5 g ofMgSO4 in a volume of 250 mL?(ii) Calculate the weight of MgSO4 in grams which is present in 100mL of 0.076 M MgSO4?(c) Evaluate the key differences between paper chromatography and gaschromatography
- The following data were obtained for four compounds separated on a 20 m capillary coloumn. Compound t,(min) w(min) A 8.04 0.15 B 8.26 0.17 C 8.43 0.18 (a)Calculate the number of theoretical plates for each compound and the average number of theoretical plates for the column. (b) calculate the average height of theoretical plates. (c) explain why it is possible for each compound to have a different number of theoretical plates?16) Which of the following(s) is/are correct? I- Selectivity factor is the amount of time a solute spends in the stationary phase relative to the time it spends in mobile phase II- The retention time for an analyte is the time interval between its injection onto a column and its appearance at the detector at the other end of the column. III- Distribution constant is the ratio of the total solute concentration in the stationary phase to that in the mobile phase. A) I, II and III B) Only II C) I and III D) II and III E) Only III for GC2How can you use ion exchange Chromatography to de-ionize water? Please shortly write at your own words. (4-5 lines maximum ).
- draw and sketch a group for action poyential polarization phases with membrane potential vm in milivoltsAnswer each of the following by True or False. Q1) Solution resistance varies as the frequency of the applied voltage charges, then resistance is normally named as impedance.( ) Q2) Physisorption or physical adsorption is a type of adsorption in which the adsorbate adheres to the surface only through Van der Waals.( ) Q3) Michelson interferometer is considered energy dispersive spectrometer for spectral analysis.( ) Q4) lodine when mixed with starch gives deep red complex.( ) Q5) (BET) theory aims to explain the physical adsorption of gas.( ) Q6) The iodination of acetone can be easily investigated because iodine has a deep green color.( ) Q7) Activated charcoal or activated carbon is carbon material that has been processed to contain many large pores creating a very large surface area.( )In have narrow peaks are said to chromatography, a) a large plate height (H) b) a small plate height (H) c) a small number of theoretical plates (N)