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11 Nov 2019
Answer Questions 1-4 please
(1:30-3:30 pm, March 7, 2018: 130 pollly Name I. Multiple choices: Choose the best phrase to finish each statement by cireling the corresponding letter. (20 points; 4 points each) (1) To effectively reduce systematic errors in measurements, we will A. make certain that human errors are not present in the experiments B. make many solutions of identical concentrations for measurements C. make repetitive measurements of the sample D. perform instrument calibration (2) In laboratory measurements, which of the follwing statements is true when we make more measurements of the same parameter? A. The 95% confidence interval becomes narrower. B. The 95% confidence interval becomes wider. C. The data distribution becomes wider D. The data distribution deviates more from the normal distribution. (3) To measure the absorbance of a solution prepared from a naproxen sodium tablet, what would be the ideal blank solution? A. Warm Millipore water B. Room temperature Millipore water C. A solution that is prepared with all the other ingredients in the tablet, but without naproxen sodium D. A pH 7 buffer (4) Why is NaOH not used as a primary standard for titration analysis? A. Its molar mass is too small. Its volume cannot be accurately measured using an uncalibrated buret C. It is highly corrosive D. It is highly hygroscopic. (5) Jordan Bohannon is our favorite Hawkeye because A. he aces chemistry experiments B. he intentionally missed a free throw in a Big Ten basketball game C. he shoots hoops with high accuracy D. he shoots hoops with high precision Page 1 of 3
Answer Questions 1-4 please
(1:30-3:30 pm, March 7, 2018: 130 pollly Name I. Multiple choices: Choose the best phrase to finish each statement by cireling the corresponding letter. (20 points; 4 points each) (1) To effectively reduce systematic errors in measurements, we will A. make certain that human errors are not present in the experiments B. make many solutions of identical concentrations for measurements C. make repetitive measurements of the sample D. perform instrument calibration (2) In laboratory measurements, which of the follwing statements is true when we make more measurements of the same parameter? A. The 95% confidence interval becomes narrower. B. The 95% confidence interval becomes wider. C. The data distribution becomes wider D. The data distribution deviates more from the normal distribution. (3) To measure the absorbance of a solution prepared from a naproxen sodium tablet, what would be the ideal blank solution? A. Warm Millipore water B. Room temperature Millipore water C. A solution that is prepared with all the other ingredients in the tablet, but without naproxen sodium D. A pH 7 buffer (4) Why is NaOH not used as a primary standard for titration analysis? A. Its molar mass is too small. Its volume cannot be accurately measured using an uncalibrated buret C. It is highly corrosive D. It is highly hygroscopic. (5) Jordan Bohannon is our favorite Hawkeye because A. he aces chemistry experiments B. he intentionally missed a free throw in a Big Ten basketball game C. he shoots hoops with high accuracy D. he shoots hoops with high precision Page 1 of 3
Lelia LubowitzLv2
5 Nov 2019
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