In order to carry out a highly accurate determination, usually of a valuable constituent in a material of large bulk such as gold, a chemist will carry out a_______________ Select one: Determination Assay Analysis Assessment Background check
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In order to carry out a highly accurate determination, usually of a valuable constituent in a material of large bulk such as gold, a chemist will carry out a_______________
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- please write legible ans show mechanismFirst order: [A]o In———- = kt [A]t t1/2= .693/kanswer 13,19,25 (IDK WHAT TO DO) PLS HELP SO THAT I CAN GET A GRASP A group of students enrolled in a Physical Chemistry Laboratory class performed an experiment on the THE STUDY OF AN ADSORPTION ISOTHERM: ACETIC ACID SOLUTIONS ON ACTIVATEDCARBON. The data gathered by the group are documented in the tables below. Solve for the unknown data.
- The decomposite was in and the followinly uala were obtained: 40 °C 2 H₂O2(aq) 2 H₂O(l) + O2(g) Time (s) [H₂O₂] 1.000 0.910 0.780 0.590 0.370 0.220 0.130 0.082 0.052 0 120 300 600 1200 1800 2400 3000 3600 Write down the rate law expression?Detail discuss different factors affecting E 1 mechanism?kindly help me with this problem thank you 2. The following data are for Xenon adsorption on ZSM5 zeolite. Evaluate the constants from thea) Langmuir and b) Freundlich. Which of the isotherm fit the data best? Explain. P(Torr) 47 136 250 364 473 577 680 mass(g) of ZSM5 zeolite/mole of Xenon 1.8832 0.8977 0.6588 0.5692 0.5255 0.4946 0.4715
- Starting with [CV] = 1.0x105 M and [NaOH]; = 0.050 M, a set of their reaction kinetics data was collected over 3 minutes and plotted as shown below, In[CV+] -11.4 -11.6 -11.8 -12 -12.2 -12.4 -12.6 -12.8 0 20 40 Crystal Violet Kinetics First Order 60 80 100 time (sec) k = 120 140 160 y = -0.0059x - 11.587 R² = 0.9987 180 The line fit data are represented by the first-order integrated rate law: [CV] = [CV]oekt Use the values obtained by the line fit of [CV*]o and k from for all the following calculations. Write these parameters below, rounded to 2 significant figures with units! [CV] = 200 Is the concentration of crystal violet at the time of mixing identical to the initial concentration calculated from the graph (at the beginning of data collection)? Why? Calculate the instantaneous rate of crystal violet consumption at the beginning of the data collection, t = 0 seconds. Rateo k[CV]o =D Ask Laftan Anlamaz - Episode X St. John's University - My App X ALEKS - Iffat Khan - Learn G pb(clo)4 compound nar i www-awn.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-lijkPWvZoZLqKt1FLIq7wcPWKzBYGfE9IMFjeRdLZdKJGrDhJv O STOICHIOMETRY Using the Avogadro Number A virus has a mass of 9.0 × 10 12 mg and an oil tanker has a mass of 3.0 x 10' kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of viruses? g Round your answer to 2 significant digits. How many moles of viruses have a mass equal to the mass of an oil tanker? Round your answer to 2 significant digits.Part A Magnesium reacts with hydrochloric acid to form hydrogen gas. The data below shows how the hydrochloric acid concentration varied with time. Time (s) [HCI) (mol dm-3)1.00 0.51 10 70 0.08 20 30 40 50 60 80 0.25 0.16 0.13 0.11 0.09 0.06 a) Plot a graph of acid concentration against time. b) By drawing gradients, calculate the rate at 0, 10, 20 and 30 seconds. c) Explain why the rate changes during the reaction as it does. Part B The initial rate method was used to investigate the following reaction: 2Hzia) + 2NOLg) + 2H2Olg) + Naia) The results of some studies which were made at 775°C are shown below: [H2] / 102 mol dm [NO]/ 102 mol dm3 Rate / 10 mol dms1 2.0 2.50 4.8 2.0 1.25 1.2 2.0 5.00 19.2 1.0 1.25 0.6 4.0 2.50 9.6 Using the data shown above, answer the questions on the following page. a) What is the order of reaction with respect to Hzg)? b) What is the order of reaction to NOy? c) Write down the rate equation for this reaction. d) Calculate a value for the rate constant for…
- show biochemistry mechanismThe following data was collected for the reaction between ethoxide and methyl iodide T(°C) Rate (1/s) T (K) 1/T (1/K) In (rate) 168 273.15 0.00366 5.12 6 354 279.15 0.00358 5.87 12 735 285.15 0.00351 6.60 18 1463 291.15 0.00343 7.29 24 3010 297.15 0.00337 8.01 30 6250 303.15 0.00330 8.74 A plot of In (rate) vs. 1/T using the above table was made and is shown below, and a linear regression line fitted to the data. Using the provided graph, estimate the activation energy (kJ/mol) of the reaction between ethoxide and methyl iodide. Enter your number using 2 decimal places without unit. Gas constant is R = 8.3144598 J. mol 1. K-1. In(k) vs 1/T 9.30 8.80 8.30 7.80 y = -9930.5x + 41.445 R² = 0.9992 2 7.30 6.80 6.30 5.80 5.30 4.80 0.00325 0.00330 0.00335 0.00340 0.00345 0.00350 0.00355 0.00360 0.00365 0.00370 1/T (1/K) Ln(k)Problems on enzyme reaction kinetics 1. Initial rates of enzyme-catalyzed reaction for various substrate concentrations are listed below: Rate Substrate concentration mol/(L min)x10 177 (mol/L) 0.0041 173 0.00095 0.00052 125 106 0.000103 80 0.000049 0.0000106 0.0000051 67 43 a) Evaluate Vmax and Km by a Lineweaver-Burk plot.