How can you prepare a set of solutions with concentrations spanning several orders of magnitudes? a. serial dilution b. crystallization c. dehydration d. high-performance liquid chromatography
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How can you prepare a set of solutions with concentrations spanning several orders of magnitudes?
a. serial dilution
b. crystallization
c. dehydration
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- Which technique is based on the stronger attractionsome components have for the stationary phasecompared to the mobile phase? A. filtration D. chromatographyB. distillation E. sublimationC. crystallizationHow can you prepare a set of solutions with concentrations spanning several orders of magnitudes? A. crystallization B. dehydration C. serial dilution D. high-performance liquid chromatography3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.
- 5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. FalseWhich form of chromatography is INCORRECTLY defined? A. partition chromatography – solute equilibrates between the stationary liquid and the mobile phase B. affinity chromatography – solute binds to a molecule specific for the solute C. molecular exclusion chromatography – solute is separated based on size D. adsorption chromatography – solute is adsorbed into solid particles E. ion-exchange chromatography – solute ions of the opposite charge are attracted to the stationary phaseOne of the problems that can be encountered in recrystallization is the failure of the solute to crystallize. In which of the following scenarios could that happen? a. Cooling the filtrate in an ice bath. b. Using a wide bore, long-stemmed funnel in the hot filtration step. c. Addition of too much water in the receiving flask. d. Washing the residue with cold solvent
- Temperature - distillate volume plot for fractional distillation of benzene (b. pt. 80°C) and toluene (b. pt. 110°C ) The area where toluene is being distilled from the mixture. a. cannot be determined. b. FR1 c. FR3 d. FR2Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?In what order should the following methods be used to separate a mixture containing sand-sugar-alcohol and water into its components? 1) Adi distillation II) Fractional distillation HII) Filtration under vacuum B. II, I, II C. III, I, II D. 1, III, II E III, II, I
- This is the most common industrial process for preparing large-scale production of nanoparticles wherein a liquid or gas is fed into a furnace and the nanoparticles are recovered by air classification. a. sol-gel method b. sputtering c. pyrolysis d. laser ablation6. The following are disadvantages of using filter paper in gravimetry, which is not included? a. React with strong acids and strong bases b. Break under mild stress c. Ashless filter paper is used d. Prevent use of suction 7. Which of the following can not be used to minimize supersaturation and thus used to crystalline properties? а. Нeating b. Using dilute solutions c. Rapid addition of the precipitating agent d. Air control1. Which of the following is the best option for transferring 20 mL of a solution? a.Use a 5mL serological pipette 4 times b. Use a 10 mL Mohr pipette twice c. Use a 20 mL Mohr pipette once d. Use a 10 mL volumetric pipette twice 2. Which glassware is NOT used in preparing a solution from a solid sample? a. Funnelb. Beakerc. Volumetric pipette