Which of the ff is false a. Weighing of the electrodes before and after the experiment can reduce the percent error. b. Partial immersion of the electrode in the solution will not affect the cell potential. c. A decrease in the measured cell potential can happen if the voltaic experiment is performed at lower temperature. d. Doubling the concentration of the anolyte will result in a decrease in cell potential.
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Which of the ff is false
a. Weighing of the electrodes before and after the experiment can reduce the percent error.
b. Partial immersion of the electrode in the solution will not affect the cell potential.
c. A decrease in the measured cell potential can happen if the voltaic experiment is performed at lower temperature.
d. Doubling the concentration of the anolyte will result in a decrease in cell potential.
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- Iontophoresis is a technique, which uses an electric current to deliver a medicine or other chemicals into a body through the skin. Find amount of potassium ions Na introduced into patient body during iontophoresis procedure having duration 5 min. The current density used in the procedure was ? = 40 μA/cm2 and area of the electrodes was ? = 30 cm2Choose the one answer that fits best. Which of the following statements regarding the proper procedure for using Micropipettes is NOT correct? O a. You cannot use a 2-20 µl micropipette to pipet 200 µl O b. To expel all the liquid from the tip, you have to press the eject button O c. To draw up solution, press and hold the plunger at the first stop before entering the solution O d. Micropipettes always require the use of a disposable plastic tip O e. While pipetting, micropipettes should always be held as straight as possibleWhich of the following specimens cannot be tested on the Velocity Macroscopic Chemistry Module? a. Gross Hematuria b. Specimens <2 mL c. Pyridium d. Diluted Specimens e. All of the above
- In the spectrofluorometric analysis of quinine, which of the following statements/phrases can be considered a factor level? A. Concentration of 2 ppm of iodide B. Concentration of quenchers C. The use of iodide D. Use of QuenchersI do not understand the results of this experiment, explain what the results of this experiment are and the purpose Table 2 Absorbance vs CoCl2 concentration Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.024 3 0.018 0.055 4 0.027 0.085 5 6 0.036 0.045 0.112 0.138 7 (Unknown) 0.088Explain the reason for the following rules: a. Always hold a loaded micropipette in a vertical positione. Always release the plunger slowlyf. Always watch to see the solution enter the tip
- Two students independently determine the volume of water delivered by a 10.00-mL pipet. Each student takes 8 measurements, then computes the average volume delivered and the standard deviation. The results are tabulated below. Average St. Dev. Student A 10.4 mL ±0.7 mL Student B 10.00 mL ±0.02 mL Which statement best describes the results? 1)A: good precision, poor accuracy. B: poor precision, good accuracy. 2)A: poor precision, good accuracy. B: good precision, poor accuracy. 3)A: poor precision, poor accuracy. B: good precision, good accuracy. 4)A: good precision, good accuracy. B: good precision, good accuracy. 5)A: poor precision, poor accuracy. B: poor precision, poor accuracy.Determine the % inaccuracy by calculating the percent error of the micropipette at the set volume of 100 µL A. Standard deviation B. Covieffecrnt of varaiant C. % error (precision) Percent error = mean volume delivered -expected volume x 100 Expected volume RUN Weight Measurement (in g) 1 0.0985 2 0.0987 3 0.0985 4 0.0982 5 0.0984 6 0.0984 7 0.0981 8 0.0983 9 0.0982 10 0.0988 Total 0.9841 A. Standard deviation B. Covieffecrnt of varaiant C. % error (precision)A 250 mg per L solution of drug is administered intravenously at a rate of 40 mL per hr to a patient with constant blood volume equal to 5 L. The drug is metabolized by the patient at a rate of 30 % per hr. Assuming the patient had no drug in their system before receiving treatment, how much is found in their system after 55 minutes? Answer BLANK mg (accuracy to at least four decimal places is required so do not round carelessly).
- The before and after fluids were observed to detect the movement of salt across the dialyzing membrane. The tables below shows the test results using chemical indicators like silver nitrate. BEFORE: Fluid in the beaker clear (absence of salt) Fluid in the bag cloudy appearance (presence of salt AFTER: Fluid in the beaker cloudy appearance (presence of salt Fluid in the bag cloudy appearance (presence of salt) Was there a movement of salt across the artificial membrane? Why or why not?The table contain results of using highly accurate P-1000 micropipette. The results in Target volume 1000 ul Target weight 1000 mg Run1 1123 mg Run2 1000 mg The students pressed to the first stop during dispensing water The students pressed to the first stop during drawing up water O The students pressed to the second stop during dispensing water O The students pressed to the second stop during drawing up waterExplain in your own words how the Endurance test (performance test) is applied to the patient turning apparatus shown in the figure, and guess how the expected result will be. The main part of the product consists of a polyurethane sponge. Stain-proof upholstery fabric will be used as the outer surface material. In addition, there are heating pads working with the logic of electric blankets in this apparatus, please answer by taking these into account when answering.