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- 1. These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mgA. semi-microanalyticalB. MicroanalyticalC. MacrobalancesD. Triple Beam Balance2. Which type of curve is normally produced when plotting the change in the concentration of a specie of some function and the amount of reagent added?A. Titration curveB. Sigmoidal CurveC. Phase Transition curveD. Calibration curve3. In the dead dear case study, silver diethyldithiocarbamateforms a colored solution when it binds with arsenic, what do we call substance like silver diethyldithiocarbamate?A. Secondary standard reagentB. Precipitating agentC. Chelating agentD. Primary standard reagentWhich of the following is not an advantage of instrumental methods? a. The ability to perform trace analysis. b. No standard is required A large numbers of samples may be analyzed very quickly. d. Most instrumental methods are multichannel techniques.Which of the following is TRUE regarding instrumental methods of analysis? A. these methods have lower throughput compared to classical method. B. these methods have lower accuracy compared to classical methods. C. these methods can measure lower analyte concentration than classical methods D. these methods have higher precision compared to classical methods.
- 1. What are the advantages and relevance of performing the following in a chemical pathology lab? i. ii. Blanking Calibration Quality control 221.Which of the following variables does absorbance not depend upon? A. Molar absorptivity of the solute. B. Path length of the sample. C. Concentration of the solute in solution. D. Conductivity of the sample.What is a requirement for a species to be analyzed using the spectrophotometric method? O a. The reaction between the reactants must produce a high molecular weight complex. O b. Analyte present in the solution must have a high absorptivity. O c. Species must be transformed to light emitting species. O d. Species must produce an intense colored complex.
- 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. FalseGive a detailed description of how these both analytical separation protocol will be employed to recover river bodies from heavy metals and particulate matter. I. Centrifugation II. Chemical precipitationb. Briefly explain THREE (3) limitations of GC in analytical chemistry.
- Coprecipitation that involves foreign particles? a. Inclusion b. Mechanical entrapment c. Surface adsorption d. OcclusionWhich of the following is incorrect: General steps in qualitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a direct proportionality between a measured property and the concentration or amount of substance. Please fill in the spa ces one of the following characters (a or b or e or d or e)5 What is the atomic number of a neutral atom that has 8 neutrons and 7 electrons? a. 15b. 8c. 7d. 1 6 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solid