There are numerous considerations when choosing an internal standard. give three reasons why 1,4-dioxane will serve as an effective internal standard.
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There are numerous considerations when choosing an internal standard. give three reasons why 1,4-dioxane will serve as an effective internal standard.
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- For the following reaction, calculate the value of Q. 3A - 4B + 2C 1 [A] 0.42 [B] = 0.82 [C] = 0.90 To avoid possible rounding errors report your answer to three significant figures. On your scrap paper you should report the proper number of significant figures if correct answer has more or less than three.professor Scimemi has accepted you as a Master’s student and you are involved in a project that studies the cellular basis of neuropsychiatric diseases. For your electrophysiology recordings you have to make a recording solution containing (in mM): 119 NaCl, 2.5 KCl, 2.5 CaCl2, 1 MgCl2, 26.2 NaHCO3, 1 NaH2PO4, 22 glucose. You need 800 ml of it. How much KCl do you need to weigh out? Hint: we only care about KCl here. (MW KCl is 74.55 g/molActivated LiCI NaCl KCI CaCl2 SrCl, charcoal*
- Select the single best answer. Consider the steps in coal gasification: C(coal) + H₂O(g) → CO(g) + H2(g) CO(g) + H₂O(g) → CO2(g) + H2(g) CO(g) + 3H2(g) → CH4(g) + H2O(g) AH'rxn = 129.7 kJ AH°rxn = -41 kJ AH'rxn=-206 kJ Identify the overall reaction for the production of methane, CH4.Is molecules A and B identical? Is molecules C and D identical? What structural feature accounts for the difference in your answers to 1a and 1b? What difference did this structural feature impart on your models?Given the following data C2 H4 (9) + 302 (9) → 2 CO2(9) + 2H,0(1) 2C2 H6 (9) + 702(9) → 4 CO2(9) + 6H2O(1) 2H2 (g) + O2(9) → 2H,O(1) AH = -1411.0 kJ AH = -3119.8 kJ AH = -571.7 kJ calculate A H for the reaction C,H4 (9) + H2 (9) → C,H6 (g) ΔΗ= kJ Submit Answer Try Another Version 2 item attempts remaining
- Analytical chemistry is a particular field within the broader spectrum of the chemical sciences, in which many times the focus of analytical experiments is to develop new methods to analyze compounds, either structurally or by determining concentrations of compounds. One of the processes analytical chemists use to determine the exact concentration of a working solution is called standardization. In your own words, describe the differences between a primary, secondary, and tertiary standard, and describe the underlying concept behind the standardization process. Why is it done?What is the difference between a primary and a secondary standard? Give an example of each.Absorbance (arb.units) SA 8.3 B-Carotene Calibration Curve 2004 65,03UM 3.26 mM 5,06 nM y=(105612 Mx-0.1736 2.94 M 4304 1064 ENY 181 121 Concentration (M) 1004 5 Abserbence (arb.units) 200 0.25 300 A student creates a standard curve of B-Carotene and plots the line of best fit. They then measure the absorbance of a solution of B-Carotene with an unknown concentration. What is the concentration of the sample? You can assume they used a cuvette with a pathlength of 1 cm. 400 500 600 Wavelength (nm) YOU