Chemistry question and answers for July 11, 2023
- Q 3. Calculate the pH of a buffer solution made by adding 25.5 gof NaCH3CO2 (MW:82.034g/mol), and 0.550M HCH3CO2 (Ka=1.8x10-5) tomake 500 mL of the buffer. a. Identify the acid and...
- Q 5. What is the pH of 250.0mL solution that is 0.0955 M HCH3CO2(Ka=1.8x10-5) and 0.125 M NaCH3CO2. a. Now, 20.0 mL of 0.455 M HCl(aq) is added to the original...
- Q How does ring size, hybridization and degree of carbon (1stdegree, 2nd degree, 3rd degree) affect SN1 and SN2 reactions?
- Q 1.A solution is made by mixing 0.150M NH4Cl and 0.100 M NH3. Ka forNH4+ is 5.61x10-10a.What type of solution you willhave when the two compounds are mixed?b.Identify the acid and...
- Q A 1.045 L sample of HCl gas at 25∘C and 732.0 mm Hg was absorbedcompletely in an aqueous solution that contained 7.086 g of Na2CO3and 270.0 g of water. What...
- Q Net-Ionic Equation for Hydrolysis? Expression for equilibriumconstant (Ka or Kb)? Value of Ka or Kb? for NaC2H3O3, Na2CO3,NH4Cl, ZnCl2, KAl(SO4)2
- Q Which of the following reactive species does not play a role inthe initiation of lipid peroxidation?a) Nitric oxideb) All of the above plays a role in the initiation of lipidperoxidationc)...
- Q What role does water play in the reaction with t-BuCl? Chooseall that apply. Multiple answers: You can select more than oneoption A nucleophile B solvent C acid D base
- Q A 1.095 L sample of HCl gas at 25 C and 732.0 mmHg was absorbedcompletely in an aqueous solution that contained 7.152 g of Na2CO3and 268.5 g of water.1) What...
- Q I have two liquids: Petroleum ether and water. I want todissolve salt (NaCl), benzene (C6H6), alcohol (CH3OH), octane(C8H18), and butter (C55H98O6) into one of the two solvents. Using“like dissolves likeâ€,...
- Q Calculate the volume of 0.820-M NaOH solutionneeded to completely neutralize 112 mL of a0.620-M solution of themonoprotic acid HCl.__________ mL NaOH
- Q For a particular redox reaction NO2– is oxidized to NO3– and Cu2is reduced to Cu . Complete and balance the equation for thisreaction in basic solution. Phases are optional. NO2-...
- Q A coal with the following composition was burnt in a power plantwith 25.0% excess air. Waht is the percent CO2 shown by Orsatanalysis? The air drawn into the furnace at...
- Q What is the pH of a 0.50 M solution of nitrous acid with a Ka of4.0 x 10^-4?
- Q Both thermoelectric power plants and irrigation use very largeamounts of water; however, the impact on a water system is verydifferent between the two. Explain.
- Q Write the reaction for the bromination of cis-stilbene and drawall the stereoisometric products. What is the relationship betweenthe products?
- Q A closed system contains 1kg of air initially at 100kPa, 30 degCelsius and 0.5m3.The air expands reversibly and isothermally untilthe volume of the system doubles.For the process determine theenthropy change...
- Q Sodium phosphate is added to a solution that contains 0.0071 Maluminum nitrate and 0.016 M calcium chloride. The concentration ofthe first ion to precipitate (either Al3+ or Ca2+) decreases as...
- Q indicate all the species, in proper sequence, to which thecopper in the powder is transformed during the course of thesynthesis of CuCl
- Q PCl5(g)--->PCl3(g)+Cl2(g)Kc= 1.80 at 250 degrees celciusA 0.173 mol sample of PCl5(g) is injected into an empty 2.55 Lreaction vessel held at 250 °C. Calculate the concentrations ofPCl5(g) and PCl3(g) at...
- Q Molarity of NaOH solution: .25 M1. Trial TitrationFinal buret volume (mL): 34.4 mLInitial Buret Volume (mL): 0mLVolume of NaOH solution (mL): 34.4 mL2. Exact titrationSample no. 1 2 3 4Final...
- Q What are the typical IR and NMR spectralcharacteristics of cinnamaldehyde, acetone, dicinnamalacetone, andcinnamaldehyde?
- Q Calculate the theoretical Iodine Number of tristearin, triolein,trilinolein and trilinolenin, if their molar masses are 891 g/mol,885 g/mol, 879 g/mol and 873 g/mol, respectively. The molar mass ofiodine (I2) is...
- Q Why don't Friedel-Crafts reactions work with a deactivatinggroup on the benzene ring?Why is it hard to put one alkyl group on a benzene ring with theFriedel-Crafts reaction?
- Q Use the following information and the Beer-Lambert law todetermine the mass of the lycopene extracted and the mass oflycopene per 100 grams of tomato paste.2mL of lycopene was extracted from...
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