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The mass of a dry, 50 mL beaker is 49.135 g. The observed volume of water in a volumetric pipette is 20.00 mL. This water is transferred to the beaker and the combined mass of the water and the beaker
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Measurement
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A car speedometer has a 5% uncertainty. (a) What is the range of possible speeds when it reads 100 km/h? (b) convert this to miles per hour.
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8 oz equal how many lbs?
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Electricity costs 6 cents per kilowatt hour. In one month one home uses one megawatt hour of electricity. How much will the electric bill be?
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Briefly explain how a mass spectrometer works. What kinds of information does one obtain from the instrument?
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What are the advantages and disadvantages of FT-Raman spectrometers compared to conventional dispersive Raman instruments?
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Rank pieces of glassware in order of increasing accuracy: 150 mL beaker, 100 mL graduated cylinder, 100 mL volumetric flask, 10 mL graduated cylinder, 50 mL burette, and 25 mL volumetric pipette.
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Name one basic principle of measurement in metrology.
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A student estimated the volume of liquid in a beaker as 200 mL. When she poured the liquid into a graduated cylinder, she measured the volume as 216 mL. What is the percent error of the estimated volu
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On the blue print of a house, the screened porch is 1.25 inches long and 0.75 inches wide. If the scale on the blueprint indicates that 1/2 inches equals 10 feet, what is the length in feet of the scr
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Measurement
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Compare and contrast the accuracy and precision of your kitchen scale to the electronic top loading balance.
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Measurement
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With our analytical balances, we have special calibration weights with very precisely known masses. If you measure a 10.000-gram calibration mass three \times and get values of 10.010, 10.009, and 10.011 grams. is the balance more accurate or more precise?
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a) Compare ISS (Ion scattering spectroscopy) to RBS (Rutherford backscattering spectroscopy). b) For both cases, draw diagrams of the instrumental setup. c) Describe any differences in the information obtained by the two techniques.
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Pipets used for the transfer of samples of solutions are always rinsed with a small portion of the solution to be dispensed with the pipet before the actual sample is taken. Calculate the percentage error likely to arise in an experiment if 1 mL, 5 mL, an
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Measurement
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How could you differentiate cinnamaldehyde and cinnamic acid by each of the following methods: a. IR spectroscopy b. Mass spectrometry c. ^13 C NMR spectroscopy For each be specific. In other words
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Is it possible for a volumetric pipette to have high precision but low accuracy? How could this situation arise? Assume there is no user error when considering your response.
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Measurement
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Describe how glow-discharge mass spectrometry is carried out. What are the advantages of this technique?
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Math
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If Angela measured the mass of the same beaker three times and her measurements were 25.43 grams, 24.23 grams, and 25.98 grams, respectively, were her measurements precise? Explain.
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Math
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A box is measured to be of lengh L=10.13 pm 0.01 ft, width W = 1.534 pm 0.002 ft and height H = 0.013 pm 0.001 ft. Calculate the volume. Write the expression for V in the form of Z = ax^b y^c w^d and find the expression for sigma V. Compute si
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Which of the diethylbenzene isomers (ortho, meta, or para) corresponds to each set of 13 C NMR spectral data?
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Measurement
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If each lap in a swimming pool is 100 meters long. How many laps does it take to go a mile?
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Measurement
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If you had to accurately measure 20 mL of a liquid, which of the three pieces of glassware would you use? a. 25 mL graduated cylinder b. 150 mL beaker c. 50 mL beaker
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Measurement
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How is after-tax salvage value for equipment calculated?
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Math
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Determine the percent uncertainty in\theta, and in sin\theta, when: 1.\theta = 15.0 degrees + 5 degrees 2.\theta = 75.0 degrees + 5 degrees
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Math
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A patient cuts 100-mg scored tablets to take his 50-mg prescribed daily dose. A prescription for thirty 100-mg tablets costs $45, and a prescription for thirty 50-mg tablets costs $40. The patient asked the pharmacist to weigh an uncut tablet and the two
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Measurement
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The legend on a map states that 1 inch is 200 miles. If you measure 11 inches on the map, how many miles would the actual distance be?
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What is the relationship between the distance on a map and the actual distance on Earth called?
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Math
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What is the si unit of a meter stick?
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Measurement
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A car speedometer has a 7% uncertainty. What is the range of possible speeds when it reads 120 km/h? 1. km/h (lowest) 2. km/h (highest)
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Measurement
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A man notices a vacant lot for sale. He finds the dimensions to be 18.3 m by 45.7 m. If both measurements have an uncertainty of 0.1 m. what is the uncertainty of its area? If the person uses a more accurate instrument to measure the lot and finds it to b
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Under what circumstances do we use IR spectroscopy for chemical analysis and under what circumstances do we use Raman for chemical analysis?
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What spectral features, including mass spectra, IR spectra, proton spectra and carbon spectra, allow you to differentiate the product (methyl benzoate) from the starting material (benzoic acid)?
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Measurement
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You invest $4000 in two stocks. In one year, the value of Stock A increases by 5.4%, and the value of Stock B increases by 12.8%. The total value of the stocks is now $4401. How much did you originally invest in each stock?
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(a) 1.26 light-years to miles (a light-year is an astronomical measure of the distance traveled by light in a year or 365 days: the speed of light is 3.00 times 10^8 m/s) boxed{space} times 10^{boxed{space}} mi Enter your answer in scientific nota
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The error that is produced when a calculator or computer is used to perform real number calculations is called Actual value Absolute Error Relative Error Round-off Error
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Compare spectroscopy and mass spectrometry. What types of applications are best suited for each?
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Explain the principles upon which mass spectrometry is based.
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(a) A person’s blood pressure is measured to be 120 plus or minus 2 mm Hg. What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg?
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An important advantage of a double-beam spectrophotometer over a single-beam spectrophotometer is that it permits A. compensation for source power fluctuations. B. narrower slits to be used; therefore, greater spectraL purity. C. rapid response detectio
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Math
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What is an inset map?
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