You conduct a redox reaction experiment with mutiple metals and nitrate solutions. One of the experiments constist of 1.0 M Fe(NO3)2 + Fe+2. You place a metal strip of Fe into the Fe(NO3)2 solution. The solution stays orange (the orginal color) for 15 minutes but after 20 minutes the solution starts turning brown. Afterwards you pull the Fe metal strip out and the metal is observed to be unchanged. Did a redox reaction occur. If not, what may have happened to cause the solution to change color? Cu(NO3)2 Fe(NO3)2 Zn(NO3)2 Cu(s) Fe(s) Zn(s)
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- What do you think would happen if 0.5M K+ was used first to elute the sample in an ion exchange chromatography experiment? Why?Fill up the two missing values inside the two circles knowing that the total reaction volume is 2mL. 1) Dilution fraction 2) Water Don't include units in your answer. Membrane Brillant blueR 1g/L Dilution Sample suspension fraction (μL) (μL) 1) Control ? 0 50 2) 1/200 ? 10 50 3) 1/100 0.01 20 50 4) 1/50 ? 40 50 5) 1/20 100 50 Phosphate pH11, 0.2M (ml) 1 1 1 1 1 Water (mL) 0.95 ? ? ?a)Determine the amount of X (in gram) in order to prepare 100 mL of 50 mM stock solution of X. Show your work. (MW of X= 225) b)Determine the volume required (mL) from the stock solution X in (i) to prepare 500 mL of MS medium containing 5 mg/L X. Show your work.
- To make a 1:100 dilution of a concentrated solution, you could O Mix 1 ml concentrated solution and 99 ml water. O Mix 10 µl concentrated solution and 990 µl water. O Mix 1 ml of concentrated solution and 9 ml of water, then take 1 ml of the resulting solution and mix that with another 9 ml of water. O Any of the above would produce a final solution that is diluted 1:100 from the starting stock solution.You have a stock solution containing 1.5 mM of substrate in borate buffer pH 9.5. You transfer 1.25 mL of this stock into a cuvette and then add 250 µl of enzyme solution to initiate the reaction. What will be the final concentration of substrate in the cuvette following addition of the enzyme? 1.5 mM 1.25 mM 0.0075 mM 7.5 mM 1250 mMAs an intermediate step in making the enzyme solution, you need to prepare Buffer X using the stock solutions of each chemical. Describe how you would make 100 mL of buffer X that has the following concentrations and pH: 50mM NaCl, 20mM Tris, 5mM MgCl2, pH 7.5 You do this starting with stock solutions of 1M NaCl, 1M Tris, 1M MgCl2, and water and a pH meter.
- You wish to determine the %concentration of a stock solution of brilliant blue FCF (MW=792.8grams/mole; extinction coefficient,25=97000M1cm 1). You take 5ul of the stock and dilute up to 1ml. You take 10ul of this dilution an dilute it up to 500ul. Finally you take 1ul from this dilution and dilute it up to 1ml in a 1cm diameter cuvette. You obtain an As91=0.001 SHOW YOUR WORK. Do not forget units. 1. What is your total dilution factor? 2. What is the molar concentration of the dye in the original stock? 3. What is the % concentration of the dye in the original stock?What is the charge of an ionized peptide in the mass spectrometer if its isotopic peaks are 0.20 m/z apart? 6+ 5+ O 4+ 3+ QUESTION 34 In the Lineweaver Burke plot shown below, which of the following is true? wwhout intr O Km is increasing, Vmax is decreasing O Km is decreasing, Vmax is decreasing O Km is increasing, Vmax is increasing O Km is decreasing, Vmax is increasing QUESTION 35 789 Mistly cloudy and Submit to save and subit Click Save All Anners ta sae al annersThe standard curve to determine the amount of betacyanin is shown below. You extracted a red pigment from a beet disc (the mass of a disc is 2 g) using 10 ml of 20% ethanol solution. You measured absorbance of the solution above the beet disc every minute for a total time of 20 minutes. The increase in absorbance was linear during a period of time from 1 min to 10 min. The absorbance at 10 min was 0.8. Calculate the amount of betacyanin extracted from 1g of a beet tissue per minute. Explain your calculations. You can use Excel or a calculator.
- What wavelength is most suitable for quantitative analyses for an analyte exhibiting the UV-Vis Spectrum shown below (which has an interfering analyte with the spectrum shown in a dashed line)? Explain why? 1.0r A B F 0.75- C 0.50 E 0.25 350 400 450 500 550 600 650 Wavelength, nm Figure 3-19 Choice of experimental wavelength. Solid line: measured species. Dashed line: interfering species. See text for delails. AbsorbanceWhich of the following accurately describes the method of ion-exchange chromatography? O more than one option are correct increasing the salt concentration of the mobile phase can disrupt noncovalent interactions between proteins bound to the ion-exchange resin proteins are covalently bound to the stationary phase until salt elutes them from the column. a covalent bond between a charged functional group and the resin prevents the functional group from eluting from the column when the salt concentration is increasedA researcher is preparing a reaction mixture to test the activity of a protein. They combine the required reaction components, which contained in a final 100 ml reaction volume 200 mM NaCl, unknown concentrations of acetic acid and acetate anions and a total [H+] concentration of 790 ricromolar. Can you determine the pH of the solution? Provide the answer to one decimal place. Note: You may need to round the numbers to get the required answer. 100 Strips pH indicator strips non-bleeding pH pH 0-14 EM-Reagents Dip in-read while still moist. immerse in weakly-buffered solutions une there is no further color change (1-10 min) 3 7 5 6