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- I. Data Record data with units. A. Standardization of KMnO4 1. Mass of beaker/paper + ferrous ammonium sulfate Empty Beaker Beaker and Sample Sample 1 7.40709 8. 4800g Sample 2 7.4364g 9.19498 Sample 3 7.46.324 8.48993 2. Buret readings Initial Reading Final Reading Sample 1 0.00mL 27.00m L Sample 2 21.6 mL 29.5mL Sample 3 33.5mL 29.3mL Mass of Sample 1.0439 0.45269 1.0259 Volume KMnO 27.00mL 27.40 mL 25.8MLa. analytical balanceb. top-loading balancec. serological pipetted. graduated cylindere. burettef. volumetric flaskg. Erlenmeyer flaskh. beaker3. Based on the measurement uncertainty of the above instruments, which instruments would yieldthe lowest percent error?80. Comment on the accuracy and precision of the data collected about these basketball free-throw shooters. a. 99 of 100 shots are made. b. 99 of 100 shots hit the front of the rim and bounce off. c. 33 of 100 shots are made; the rest miss.
- Which is NOT a quantitative measurement of a pencil?A. lengthB. massC. colorD. diameterHow is accuracy and precision related to errors incurred in the chemical analysis? Why systematic errors are also called determinate errors? Why random errors are also called indeterminate errors? Give two examples of each of the following sources of errors. a. Instrumental error b. Personal error c. Method/operational error3. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is a. 500 mg b. 250 mg c. 60 mg 4. The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%
- Please help me answer these. These are not graded. For practice purposes only.2. What’s the main purpose of the glass shields on an analytical balance? A. To calibrate the balance B. To stop the current C. To keep out pests D. To prevent finger prints from getting on the weigh panThe Mercaptan content of household gas supplies is monitored continually to ensure that the gas has a sufficiently obnoxious odor to warn of dangerous leaks, what analytical method should be applied to ensure this feat? A. Gravimetric 2. B. Spectroscopic C. Volumetric D. Electroanalytical A branch of chemistry that deals on the analysis, techniques of instrumentation and data interpretation of experimental results. A. Physical Chemistry It is a chemical classification that can be used for general procedures that require stringent quality specifications and a purity of 295%. A. Laboratory grade 3. C. Analytical Chemistry B. Biochemistry D. Inorganic Chemistry 4. B. ACS grade C. Technical grade D. Special purpose 5. These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mg A. semi-microanalytical B. Microanalytical C. Macrobalances D. Triple Beam Balance
- 17. Alphonse Bertillon (1853-1914) devised the first sci- entific system of using a series of body measurements. 18. Criminal laboratories exist in the United States under the control of various governmental agencies at the and levels. 19. In Melendez Diaz v. Massachusetts, the U.S. Supreme Court addressed the practice of using lieu of in-person testimony by forensic analysts. 20. The of physics, chemistry, and geology for the identification of the crime scene investigation. in of the crime laboratory makes use is responsible for dispatching trained 21. The personnel to the scene of crime for retrieving evidence. 22. The application of science to criminal investigation was advanced by judge in Austria. 23. In Fyre v. United States the set forth, which serves as the criterion for judicial ad- missibility of scientific evidence. a public prosecutor and principle was 24. The U.S. Supreme Court held that in assessing the ad- missibility of new and scientific evidence, the trial judge does…15. A student collected the data shown below to determine experimentally the density of distilled water. Mass of gradusted cylinder + distilled H20 sample.. Mass of empty graduated cylinder ... 141 g Mass of distilled H20 sample ....... Volume of distilled H20 sample .... 25.3 mL : 163 g Based on the experimental data collected, what is the density of the distilled water? A) 1.0 g/ml B) 0.253 g/ml C) 0.87 g/ml D) 1.15 g/ml 16. Find the density in g/cm³ of Ivory, if a rectangular piece 23.0 cm by 15.0 cm by 15.5 cm has a mass of 10.22 Kg. A) 1.91 g/cm3 B) 191 g/cm? C) 0.0191 g/cm D) 3.00 g/cm E) None of the above1. Convert 168 nm3 to ft3. a.5.93 x 10exp-16 ft^3b.5.93 x 10exp-24 ft^3c.5.22 x10exp22 ft3d.6.00 x10exp-15 ft3