4. A student prepared a compound. The melting point of the crude product was 42 to 48°C.After purifying the solid for the first time, the melting point was 47 to 51°C. After anotherpurification, the melting point was 50 to 53°C. At this stage, can the student confidentlysay the product has been completely purified? Justify your answer.ied

The solubility of a solid in a liquid generally increases with increase in temperature. When…

Answered: 4. A student prepared a compound. The…

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter25: Gas-chromatographic Analysis Of Gasolines

Section: Chapter Questions

Problem 2Q

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Given the Ksp for Ag2CrO4 is equal to 1.20 x 10-12, calculate the percent error in your experimentally determined value for average Ksp (this will be an extremely large percentage – think about why).
In any manufacturing process, reaction monitoring ensures that a chemical reaction proceeds as expected. Table 1 shows the monitoring data for the formation of chlorohexane, collected using a technique called gas chromatography. Note that the concentrations of the chlorohexane solutions are given in millimoles per litre (mmol l–1). The abbreviation mM (millimolar) is frequently used. Plot a graph of the data in Table 1. The graph should be drawn on graph paper or use fine grid if it’s drawn on Excel. Elapsed Time/Hours Concentration of Chlorohexane/mM 0 0 2 40 4 65 6 80 8 90 10 95 12 99
Given the following data/observations for experiment #43B [39B]: a. the mass of Benzyltriphenylphosphonium Chloride (BTPC)(limiting reactant) used was 0.486g. b. the observed melting point of the purified product was 145-149 °C. c. the mass of the purified product was 0.217 g. Calculate the theoretical and the percent yield of the purified product from the above data (show all appropriate calculations and units). Comment on the % yield and the purity of the purified product (included any appropriate errors to explain the results).
For the following organic reaction identify the mystery reactant R, its stoichiometric coefficient N, and any other substance X that must be present. CH3 CH₂ =C-C-CH=CH₂ || CH₂ Chemical formula of R: Stoichiometric coefficient N: + NR Must any other substance X be present? X CH3 | CH3 CH–CH–CH2–CH3 T CH3 If you said an additional substance X must be present, enter its chemical symbol or formula: 0 yes no 90 X 5
Distinguish between mixed-acid fermentation and butanediol fermentation and describe the test(s) that can be used to detect each. Briefly describe the reactions and changes that take place during the decarboxylation of amino acids in the decarboxylase medium. Explain the experiment that you would perform in order to determine whether the organism that you were instructed instructed to identify is positive or negative for gelatin hydrolysis. How do microorganisms such as bacteria eliminate harmful reactive oxygen species? Nitrate reduction to nitrite is indicated by the formation of a pink to red color after addition of nitrate test reagent. However, if a culture does not produce a colour change several possibilities exist. Explain.
The acid-catalyzed hydrolysis of sucrose, C12H22O11 + H₂O + H+ -> C6H12O6 + C6H12O6 + H+ is known as "inversion of sucrose" because the angle, a, by which the solution rotates polarized light changes from positive to negative as the reaction proceeds (data from 30 degree C): t/hr a 0 78 2 71 4 12 18 24 42 65.10 44.60 32.40 22.45 2.30 48 -1.96 61 -9 86 95 -15.80 -17.25 -21.15 ∞ Use this data to show that the reaction is first order and determine its rate coefficient (at 30 degree C).
rsity o... ingsbo... kboard... ARED4 ethod? 7... F2 Remaining Time: 1 hour, 22 minutes, 23 seconds. Question Completion Status: A Moving to the next question prevents changes to this answer. Question 1 # The angle of the water molecule (H₂O) is 180 degrees 120 degrees 100 degrees 90 degrees 109 degree A Moving to the next question prevents changes to this answer. MAR 14 80 F3 SA $ 000 F4 tv % F5 NA MacBook Air 22 F6 ∞r F7 45.113
The PCC (1-piperidinocyclohexane carbonitrile) content of a clandestinely synthesized PCP (phencyclidine) sample can be determined by precipitating and weighing the product: PCC + Phenylmagnesium Bromide → PCP MW = 186.258 g/mole MW = 181.31 g/mole MW 243.387 g/mole In one analysis, 0.702 g of sample was dissolved in 25 mL of cylcohexanone and 1 g of phenylmagnesium bromide was added. After 25 minutes, the precipitate was filtered, washed with acetone, dried at 110°C, and found to weigh 0.869 3 grams. Find the recovery in wt% of PCC in the sample. In another analysis, the same sample was found to contain 5.17% of another impurity. What is the separation factor of this impurity in relation to PCC?
aining Time: 30 minutes, 45 seconds. Question Completion Status: 10 36 20 30 40 37 38 39 Give the product. 50 40 a C 41 47 OH T'H You H a "OH 8 1.BH3 2. H₂02, NaOH 43 CE ""H OH H Ch 1''H 44 49 50 51
Q5: If the Ksp of Ca3N2 is 6.06 x 10-3, how many moles of calcium nitride (s) could you dissolve in 1.589 L of solvent (assume that calcium nitride (s) dissolves in water to form Ca2+(aq) and N3- (aq))? Enter your answer with at least 3 sig figs. Please provide only typed answer solution no handwritten solution needed allowed
For each of the following reactions, choose which expression represents Ke. a. TIC13 (8) TICI(s) + Cl₂ (9) [TIC13] [TICI] [C1₂] O Ke OKc = [Cl₂] [TICI] [C1₂] [TIC13] 2- b. CuCl₂² (aq) → Cu²+ (aq) + 4Cl¯ (aq) Ke OKC Ke = Кс Oke Oke = O Kc = = = c. 302 (g) 203 (9) [0₂]³ [03]² [03]² = = [Cu²+ ][CI-14 [CuCl2] [CuCl2-] = [Cu²+ ][CI] [Cu²+ ][CI] [CuCl2] [02] ³ [03] ³ 10.1²
Draw the structure of the major organic product of the reaction. You do not have to consider stereochemistry. All carboxyl and amino groups should be drawn in the neutral form. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. MA NⓇ NH₂ MILL Sn [F ▶ Ⓒ ۵۰ [] √n

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