Chemistry question and answers for September 05, 2023
- Q This is Organic Chemistry Lab, Solvent Extraction.1. What are the criteria for solubility of organic molecules inwater?2. If methylene chloride was used as the organic solvent insolvent extraction, instead of...
- Q 1)what is standardization?2) what is the significance of an endpoint?full lengthy detailed answer
- Q What is the pH of a solution containing 0.383mol L-1Â CH3COOH and 0.392CH3COO-Â mol L-1Â ? Roundyour answer to 2 decimal places.
- Q Codeine (C18H12NO3) is a weak base, (pKb= 5.79). A solution of5*10^-2M solution has a pH of 10. Calculate the [C18H22NO3],[C18H21NO3] and [OH-] at equilibruim.
- Q 4. The rate with which enzymes can transform a substrate variesfrom enzyme to enzyme, and sometimes substrate to substrate. a) Howare competitive and uncompetitive reversible inhibition similar?How is their effect...
- Q How can the process of \"aging\" explain the difference betweenorganophosphates used as pesticides and those used as chemicalwarfare agents?
- Q I need to know theprocedures of the experimentbelow :Separation of a Three-Component Mixture by Extraction​benzoic acid    ethyl4-hydroxybenzoate diphenyl sulfoneA 1.5-gram sample of a 1:1:1 (by weight) mixture of benzoicacid, ethyl...
- Q Canyou discuss the following water quality parameters: what componentsdetermines each parameter and please give examples- pH-Alkalinity-Hardness-Turbidity-Natural Organic matter-Total dissolved solids-Dissolved Oxygen-Water Microbiology
- Q Hippuric acid (HC9H8NO3), found in horse urine, haspKa=3.62.Calculate the pH in 0.150 M hippuric acid.
- Q Calculate the molar solubility ofAg2CrO4(s) in (Solubility ProductKsp at 25 °C is 9.0 × 10−12)A) pure waterB) in 0.500 L of a solution containing 0.950 gK2CrO4
- Q Benzoic acid is a weak monoprotic acid occurring in most ofberries. The acid dissociation constant of benzoic acid is 6.3 x10-5. Find pH and percent of dissociation of 0.001 M...
- Q Describe the extraction of magnesium from seawater in the Dowprocess. Show all relevant equations involved in the process,starting with the precipitation of Mg2+ as Mg(OH)2(s) using CaO(s)until the electrolysis of...
- Q You want to convert 2-chloropentane(an alky halide) into1-pentene (an alkene). Which of the following reagents would youchoose? (A)NaOH/water (B)KOH/methanol  (C)CH3ONa/CH3OH(D)(CH3)3COK/(CH3)3COHConsider the SN2reaction of butyl bromide with hydroxide ion , Assuming noother...
- Q Consider the ionic solid Pb(OH)2. When dissolved in purewater, its solubility is found to be 6.7×10-6 M.Give the formula of the anion in this compound.(The \"Edit Answer\" button will allow...
- Q The data below was collected in an experiment to determine thesolubility of sodium nitrate at 20 Celsius degree.Total Volume of Water (mL)Saturation Temp (Celsius degree)Solubility (g salt/100g water)3.5078.03.7570.04.0060.04.2552.04.5045.04.7540.05.0036.01. If 5.0000g...
- Q What is the pH of a 0.39 M solution of sodium oxalate,Na2C2O4? Acid ionization constantsfor oxalic acid are Ka1 = 5.6 x 10-2and Ka2= 5.4 x 10-5.
- Q For each pair of elements and compounds listed below, discusstheir similarities and/or differences in terms of physical andchemical properties.(a) Boron (B) and silicon (Si)(b) BeCl2 and MgCl2;(c) Al2O3 and In2O3;
- Q Solutions of sulfuric acid and lead(II) acetate react to formsolid lead(II) sulfate and a solution of acetic acid. 5.10 gg ofsulfuric acid and 5.10 gg of lead(II) acetate are mixed.A....
- Q Youwill work as a group on this exercise. A sample of tert-butylbromide (2-bromo-2-methyl propane) has been contaminated with somemethyl bromide. The NMR spectrum of this sample shows two signals,one at...
- Q Water ChemistryRespond to the following questions: Consider the bonding andgeometry of the water molecule.A) How many bonds does Hydrogen typically form? How many bondsdoes Oxygen typically form?B) What is the...
- Q Draw the mechanism and label products and reactants for thesynthesis of aniline to 4-Bromo-2-Chloroacetanilide:Aniline + Acetic Anhydride --> Acetanilide + Acetic AcidAcetanilide + Bromine --> 4-BromoacetanilideSTEP 1: Hydrochloric Acid +...
- Q The Racah parameter B is 460 cm-1 in [Co(CN)6]3– and 615 cm-1 in[Co(NH3)6]3+. Consider the nature of bonding with the two ligandsand explain the difference in the B value.
- Q For the triprotic acid, H+glutamic acid, pK1=2.23, pK2=4.42 andpK3=9.95. If one has 0.10L of a 1.0E-2 M solution and titrates itwith 0.255 L of a 1.0E-2 M KOH solution, what...
- Q Explain in cohesive sentences the advantages of LC/MS overGC/MS
- Q Estimate Keq for the following equilibria at 350 K. R = 8.3145J/(mol*K). Substance ΔHo(kJ/mol) So(J/(mol*K)) SnO2(s) -577.6 49.0H2(g) 0 130.680 CO(g) -110.5 197.7 Sn(s, white) 0 51.2 H2O(l)-285.83 69.95 Fe(s)...
- Q Which gas would you expect to behave more like an ideal gas;HCl, H2O, or He? Why?
- Q Construct flow charts (a.k.a. flow diagrams) to show how toseparate each of the following pairs of water insoluble compounds:a) a carboxylic acid and a neutral compound (e.g., a hydrocarbon,R-H); b)...
- Q Using the ideal gas law, explain how the gas pressure sensor mustwork for the vernier labquest.
- Q We have a solution of proteinthat has a concentration of 0.25 mg/ml.a.We need 20 g of the protein for anexperiment. What volume of the protein solution do we need?b.Suppose we...
- Q The bright-red color of highway safety flares comes fromstrontium ions in salts such as Sr(NO3)2 and SrCO3. Burning a flareproduces strontium ions in excited states, which then emit redphotons at...
- Q Part AHow many milliliters of0.135Â Â MÂ Â HCl are needed to completelyneutralize 46.0 mL of0.101Â Â MÂ Â Ba(OH)2 solution?Part BHow many milliliters of0.126Â Â MÂ Â H2SO4 are needed toneutralize 0.180 g of NaOH?Part CIf 55.6 mL of BaCl2 solution...
- Q A solution of fructose,C6H12O6, a sugar found in manyfruits, is made by dissolving 38.0 g of fructose in 1.00 kg ofwater. What is the molal concentration of fructose the solution?What...
- Q Experiment: Synthesis of Benzoin:2.6g of thiamine hydrochloride in a flask was dissolved in 8mlof water, 30 ml of ethanol was added and cooled on an ice bath. 5mlof 3M Sodium...
- Q Concept questions: 1) Acetic acid is a weak acid. Why is a 2Msolution of acetic acid less hazardous than a 2M solution ofhydrochloric acid? 2) What species must be present...
- Q H2 + I2 yields 2HIAt the start of the reaction 1 mole of I2 and 1 mole of H2 areput into a 10 liter container. There is no HI present....
- Q Suppose you have an organic sample X that issomewhat soluble in water, even though it issomewhat more soluble in dichloromethane or ether solvents. Butif you do a singleextraction, you get...
- Q How do potassium sorbate and benzoate kill yeasts and molds?Would they impart an off-flavor in food?
- Q In some materials the relationship between stress and strainduring plastic deformation is given by σ= σy+ K(ε − εy) n  whereK and n are constants. What is the energy absorbed by...
- Q Why are cold solvents preferred during recrystallization andwhen is recrystallization selected vs other purificationtechniques?
- Q Would cyclohexanone have 2 or 3 unique hydrogen for H-NMR?
- Q Discuss the microstructure of polymers based on the geometricalstructure.
- Q Calculate delta H for the reaction H(g) + Br(g) = HBr(g), giventhe following information:H2(g) + Br2(g) = 2HBr(g) delta H = -72 kJH2(g) = 2H(g) delta H = +436 kJBr2(g)=...
- Q 1-1Based on the Gibbs freeenergy of formation of substances listed in the table below,calculate EMF for the following cells:(i) Zn | Zn2+ (1.0 M) || H+ (1.0 M) |O2 (1...
- Q Which of the following reactions isunique to the process of glycolysis?           a.        fructose-1,6-bisphosphate ====> glyceraldehyde-3-phosphate +   dihydroxyacetone phosphate           b.        2-phosphoglycerate =====> 3-phosphoglycerate           c.        glucose-6-phosphate =====> fructose-6-phosphate           d.        phosphoenolpyruvate =====> pyruvate
- Q At 500 °C, cyclopropane (C3H6) rearranges to propene(CH3CH=CH2):C3H6 (g) ------> CH3CH=CH2 (g)The reaction is first order and the rate constant is 6.7 x 10-4s-1. (a) What is the rate law...
- Q Discuss the IMF of caffeine used in a TLC experiment with 1:1Hexanes / Ethyl acetate as the solvent system and explain why thepolarity of caffeine is high or low in...
- Q could you please do the calculationsSolution of 2 mM K2PdCl6 in 0.5 M H2SO4please dear I want to work in the lab and I want you to calculatehow many mg...
- Q Alginate and Calcium Chloride make spheres possible throughspherification.Can you explain this process and talk about how the concentration,dropping height, and rate matters?I'll appreciate as many details as you can say...
- Q Complete the definitionschiralitylitmus neutralityinsoluble complexesoxidation of methyl ketoneshemiacetalsacetalshemiketalsketalshydrolysis of ketals
- Q A 25.0 mL sample of 0.100 M barium chloride reacts with 40.0 mLof a 0.200 M lead (II) sulfate solution to form barium sulfate andlead (II) chloride.A) Write the balanced...
- Q Second eyes for a final draft please-A small baggie of glucose solution is placed in asmall beaker of distilled water. We pulled a sample of water(colorless) from the bottom of...
- Q 1) Constant-volume calorimeters are sometimes calibrated byrunning a combustion reaction of known ΔE and measuring the changein temperature. For example, the combustion energy of glucose is15.57 kJ/g. When a 2.500...
- Q The equilibrium constant, K, for the following reaction is10.5 at 350 K.2CH2Cl2(g)=CH4(g) +CCl4(g)An equilibrium mixture of the three gases in a 1.00 L flask at350 K contains5.12×10-2 MCH2Cl2,0.166 M CH4...
- Q Suppose that you have 125 mL of a buffer that is 0.260 M in bothhydrofluoric acid (HF) and its conjugate base (F-). Calculate themaximum volume of 0.400 M HCl that...
- Q a.) How many grams of NH3 can be produced from 4.19 mol of N2and excess H2? Express your answer numerically in grams.b.) How many grams of H2 are needed to...
- Q Chemistry of lipid oxidation?–State specific aspects (aromas, colors) that play into this
- Q Abeaker with 175 ml of an acetic acid buffer with a pH of 5.0 issitting on a benchtop. The total molsrity of acid and conjugatebase in this buffer is 0.10...
- Q Balance each of the following half-reactions, assuming that theyoccur in basic solution. CH3OH(aq)?CH2O(aq)
- Q An aqueous solution contains 0.480 M acetic acid. How many mL of0.327 M potassium hydroxide would have to be added to 250 mL ofthis solution in order to prepare a...
- Q Which of the following are generally required in a E2 reaction?Choose all that apply.A. strong baseB. anti-coplanar orientation of eliminated groupsC. Primary or secondary substrateD. Good leaving groupE. strong nucleophile
- Q A certain first-order reaction has a rate constant of3.00×10−2 s−1s−1 at 21 ∘C∘C. What is the value of kk at51 ∘C∘C if EaEaE_1 = 76.0 kJ/molkJ/mol ?Express your answer using...
- Q Howmany grams of NaH2PO4 (119.96 g/mol) are needed to make 500 mL of a0.2 M phosphate buffer at pH 7.5? The pKa of phosphate is7.21
- Q A reaction has a rate constant of 1.22*10^-4/s at 270C and 0.230/s at 78 0C. Determine theactivation barrier for the reaction. What is the value of the rateconstant at 18...
- Q What is the molarity of a 7.48 m solution of ethanol (C2H5OH) ifthe density of this solution is 0.869 g/ml?
- Q Refractive indices of aromatic molecules are higher than thoseof saturated hydrocarbons; for example, for benzene andcyclohexane, n=1.50112 and 1.4290 at 20C, respectivly. Can yousuggest a reason for why n for...
- Q A beaker with 195 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q Calculate the energy of the emitted photon as well as thewavelength and frequency of electromagnetic radiation emitted fromthe hydrogen atom when the electron undergoes the transition from n= 5 to...
- Q Sensor Specification:1- What's the parameter related to how close your sensorreadings are from a reference method readings?2- What's the parameter related to the dispersion of yoursensor's multiple readings in a...
- Q From the Fe2+ concentrations given determine the mg of Fe in theoriginal vitamin tablet. You will need to convert ug/mL into mg ofiron. You also have to consider that the...
- Q 2. You are given a pure protein sample tocharacterize and provided the following information:Its molar extinction coefficient, ε280, is 0.30 litersmicromole-1 cm-1Its ΔGo for unfolding is 1.5 kcal/mol at 37o...
- Q The solubility of O2 (g) in water at 0 oC = 14.74 mg/L. Thesolubility decreases to 7.03 mg/L at 35 oC.Calculate kH (Henry’s Law Constant) for water at thesetemperatures.partial pressure=0.21
- Q It is relatively easy to study sodium vapor spectroscopicallyover boiling sodium at 1160 K. There is a question whether themolecule, N_a3 is linear or bent. Which would have the largestmolecular...
- Q Calculate the standard enthalpy change for the followingreaction at 25 degrees C.HCl(g) + NaOH(s) ---> NaCl(s) + H2O(l)
- Q What does the valence of the individual atom have todo with ionic and covalent bonding forces?
- Q A 30.0- mL sample of 0.165 M propanoic acid is titrated with0.300 MKOH . Part A Calculate the pH at 0 mL of added base. Part BCalculate the pH at...
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