Chemistry question and answers for July 25, 2023
- Q Calorimetry and Standard Enthaply question: Manganese reactswith sulfuric acid to produce manganese (II) sulfate and hydrogengas.Mn(s) + H2SO4(aq) ---> MnSO4(aq) + H2(g) When 1.230g of Mn iscombined with enough sulfuric...
- Q Calculate the pH and concentrations of CH3NH2 and CH3NH3 in a0.0323 M methylamine (CH3NH2) solution. The Kb of CH3NH2 = 4.47 ×10-4.
- Q 1. You are working with chymotrypsin, and you mutate the Ser-195to Alanine and see a 106–fold decrease in activity. You also,separately, mutate His-57 to Alanine and see a similar decrease...
- Q 7. Discuss the primary issues associated with proteinfolding.
- Q Answer the following for the reaction:Pb(NO3)2(aq)+2KCl(aq)→PbCl2(s)+2KNO3(aq)How many milliliters of a 2.05 M Pb(NO3)2 solution will reactwith 40.5 mL of a 1.45 M KCl solution? Please show work!Thanks
- Q 1) Calculate of pH of each of the following strong acidsolutions: (a) 8.5 x 10^-3 M HBr, (b) 1.52 g of HNO3 in 575 mL ofsolution, (c) 5.00 mL of...
- Q A) Suppose you dump a bucket of water (5.00kg at 15.0C) outsideon a cold night where T = -10.0C, and the water spreads out over anarea so large that the...
- Q Calculate the concentration of all species in a 0.14 M KFsolution.[K+], [F−], [HF], [OH−], [H3O+]please give each value clearly
- Q How long will it take 10.0 ml of Ne gas to effuse throughaporous barrier if it has been observed that 125 mins are requiredfor 10.0 ml of AR gas to...
- Q Calculate the pH of the solution after the addition of thefollowing amounts of 0.0656 M HNO3 to a 70.0 mL solution of 0.0750M aziridine. The pKa of aziridinium is 8.04.a)...
- Q Hi! I am working on a lab for Organic Chemistry and I want tomake sure my answers are correct before submitting it!Thank you in advance!Stereoisomerism: A Model ExerciseIn this experiment...
- Q In the reaction A + 2B ---> 3C + D , If 93g of A and 85g of Bare combined, which reactant is the limiting reagent, and what isthe theoretical...
- Q What inferences can be made? NaOH was added to a blue-greensolution (Fe3+, Ni2+, Mn2+,Cr3+, and/or Zn2+). After stirring, thesolution appeared light green with no precipitate.
- Q 1A) When making the decision to use column chromatography as aseparation method you must consider the sample size as well as wellas its chromatographic behavior (ability to be separated using...
- Q 1. Determine whether each statement below is True (T) or False(F). a. ____ If A,B and C are elements whose electronegativitiessatisfy xA > xB > xC, then then (ΔAC)1/2 =...
- Q Which of the following gives a buffer solution when equalvolumes of the two solutions are mixed?(a) 0.10 MHF and 0.10 MNaOH​(b) 0.20 MHF and 0.10 MNaOH​(c) 0.10 MHCl and 0.20...
- Q Derive the Maxwell Model and Voight Model for polymerviscoelastic properties with regards to Creep and StressRelaxation. State the practical limitations of these models inaccurately describing polymer viscoelasticity
- Q Aqueous hydrobromic acid HBr reacts with solid sodium hydroxideNaOH to produce aqueous sodium bromide NaBr and liquid water H2O.What is the theoretical yield of water formed from the reaction of79.3g...
- Q If the Kb of a weak base is 4.1 × 10-6, what is the pH of a 0.50M solution of this base?
- Q Why does a change in polarizability in a molecule allow avibrational mode to be Raman active? Why does a change in dipolemoment allow a vibrational mode to be IR active?...
- Q At a certain temperature, the equilibrium constant for thefollowing chemical equation is 2.20. At this temperature, calculatethe number of moles of NO2(g) that must be added to 2.73 mol ofSO2(g)...
- Q Explain the inductive affect in acids and bases
- Q Find the pH of a solution made by dissolving 0.195 g of phenol(C6H5OH) in enough water to make 125 mL of solution.
- Q A 1.00 L flask is filled with 1.20 g of argon at 25 ∘C. A sampleof ethane vapor is added to the same flask until the total pressureis 1.450 atm...
- Q what is the pH of 0.124 M pyridine (C5H5N)?
- Q Titanium occurs in the magnetic mineral ilmenite (FeTiO3), whichis often found mixed up with sand. The ilmenite can be separatedfrom the sand with magnets. The titanium can then be extracted...
- Q A 110.0 −mL sample of a solution that is 2.8×10^−3 M in AgNO3 ismixed with a 220.0 −mL sample of a solution that is 0.11 M in NaCN.A complex ion...
- Q Aqueous hydrobromic acid HBr will react with solid sodiumhydroxide NaOH to produce aqueous sodium bromide NaBr and liquidwater H2O .Suppose 60. g of hydrobromic acid is mixed with 48.8 g...
- Q When an ant bites you, the reason it stings is because of aninjection of formic acid. What is the pH when 50.00 mL of 0.1480 Mformic acid (HCOOH) is titrated...
- Q Calculate the mass of NaCN that must be added to 250.0 mL ofwater in order to obtain a solution having a pH of 11.25? [Ka ofHCN = 4.9 × 10–10]...
- Q a) Copper solutions are typically blue to blue green in color.What color of light would they be expected to absorb in thegreatest amount?RedVioletBlueGreenb) Based on your answer to theprevious question...
- Q Hydrogen gas can be prepared by reaction of zinc metal withaqueous HCl: Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) How many liters of H2would be formed at 636 mm Hg and 17 ∘C if 27.0 g...
- Q Two aqueous solutions are at room temperature and are mixed in acoffee calorimeter. The reaction causes the temperature of theresulting solution to fall below room temperature. Whicch statementis true? A)...
- Q What is the expected pH of a 0.250 M solution of oxalic acidwith Ka = 5.37 x 10^-5 ([H+] = 0.002197) and will the pH increaseby one unit if the...
- Q Consider the reaction Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s) at 73 ∘C ,where [Fe2+]= 3.70 M and [Mg2+]= 0.310 M .What is the value for the reaction quotient, Q, for thecell?What is the value for...
- Q Theory of enzymes. [Indicate whether the following statementsare true or false by writing T or F in the spaces provided.] _____Enzymes catalyze reactions by increasing the reaction free energy(ΔG). _____...
- Q Explain why the presence of crystals of the sample at thestarting point causes streaking of the TLC plate duringdevelopment.
- Q What is the [OH-] of a solution which is 0.18 M in ammonium ionand 0.10 M in ammonia?The answer should be 1.0 x 10^-3. Please show al the work.Thanks!
- Q An aqueous solution with a pH of 2.22 is diluted from 2.04 L to3.92 L. What is the pH of the diluted solution?Thanks in advance!
- Q Calculate E cell for the new conditons: How does the voltagechange and why? (please explain using Le Chateliers principles)Mg(s) , Mg+2(0.500M) ; Al+3 (2.500M), Al(s)SHOW UNITS
- Q Draw the process of the rusting of iron and note the 4-5chemical ½ reactions. How do we prevent rusting?
- Q A wedding ring has a mass of 7.804 grams and is made of gold andsilver. When the ring has been heated to 96.53
- Q Solutions with a constant volume of 10.0 mL contain 0.750mg ofdissolved tooth enamel plus variable concentrations of addedSr.Added Sr(ng/mL=ppb) Signal(arbitrary units)Added Sr: 0 , 2.50, 5.00, 7.50, 10.00Signal: 28.0, 34.3,...
- Q Weak base/ Strong acid titration curve question.1) In the titration of .0400 M weak base B of 50 ml with .100 MHCl. What is the solution pH before any HCl...
- Q If 1.2 g of aspirin were dissolved in 100 mL of water, how muchaspirin might you be able to recover if you were to extract theaqueous solution with 100 mL...
- Q A production facility heats various equipment using a network ofheated air and water vapor lines. A boiler produces a 195.0 mol/hrstream consisting of 0.590 mol fraction of water and 0.410...
- Q a.You have 40.0 mL of a 0.100 M solution of HClO, with aKa of 3.0 x 10-8. b. What is the pH of thesolution after the addition of 30.0 mL...
- Q A. The activation energy of acertain reaction is 42.0 kJ/mol . At 29 ∘C , the rate constant is0.0190s−1. At what temperature in degrees Celsius would thisreaction go twice as...
- Q If the Kb of a weak base is 3.2 × 10^-6, what is the pH of a0.50 M solution of this base?
- Q A 5.079 g sample of a solid, weak, monoprotic acid is used tomake a 100.0 mL solution. 26.00 mL of the resulting acid solutionis then titrated with 0.09454 M NaOH....
- Q Calculate the pH change that results when 12 mL of 2.8 M HCl isadded to 580. mL of each of the following solutions. Use theAcid-Base Table. Please see pH changes...
- Q What volume (to the nearest 0.1 mL) of 7.10-M HCl must be addedto 0.550 L of 0.350-M K2HPO4 to prepare a pH = 7.50 buffer?
- Q Extraction of Trimyristin from Nutmeg Lab1. Why is acetone a good solvent to recrystallize thetrymyristin? What are the disadvantages?2. Assume that the amount of trimyristin in nutmeg is 20% byweight....
- Q Write the z-matrix for Coronene. Assume all Carbon-Carbon bondlengths to be 1.40 Angstroms and all Carbon-Hydrogen bond lengthsto be 1.07 Angstroms. Include the connectivity table.
- Q calculate the pH of the following aqueous solution at 25degreesCelsius and .35M NaF (pKa for HF=3.14)
- Q How was excess NaOH avoided in the separated solid soap?
- Q Aqueous solutions of lead(II) nitrate and potassium bromide aremixed together. (The solution turns cloudy white during the re
- Q The solubility product for barium sulfate is 1.1*10^-10.Calculate the molar solubility of barium sulfate.1) 5.5*10^-11 mol/L2) 1.1 *10^-5 mol/L3) 2.1*10^-5 mol/L4) 1.1*10^-10 mol/L5) 2.2*10^-10 mol/LI don't understand how to solve...
- Q 5.Describe qualitativelythemicrostructural development that will occur upon slow cooling fromof 1050 steel from 1600 °C to 20 °C.6.a). What are p-typesemiconductors? What are their differences comparing with n-typesemiconductors?b).Moore’s law predicts...
- Q Now that Hermione understands empirical formulas she wants toteach Harry and Ron. What is the empirical formula fordibromoethane: C2H4Br2A. CH2Br2B. CH2BrC. C2H4BrD. CHBrE. C2H2Br22.Calculate the maass percent composition of carbon...
- Q Why is it not necessary to test the reactivity of the elementalmetals with solutions of the same metal ion? To illustrate yourexplanation, write the equation for the potential chemical reactionusing...
- Q The formula for methane is CH4 and it’s molar mass is16.04 grams/mol.(a) How many moles of methane are in 2.750 grams of methane?(b) How many molecules of methane are in...
- Q When solutions of silver nitrateand calcium chloride are mixed, silver chloride precipitates out ofsolution according to the equation2AgNO3(aq)+CaCl2(aq)→2AgCl(s)+Ca(NO3)2(aq)What mass of silver chloride can be produced from 1.51 L of a0.201...
- Q briefly explain how ion exchange chromatography works. Why isthe pH of the elutent changed during the seperation?
- Q Experimental measurement shows that 0.200 M arsenious acid,H2AsO3 (aq), is 0.0051% dissociated at 25degrees Celsius. Determine the value of the acid-dissociationconstant of H2AsO3 (aq) at 25 degreesCelsius.
- Q Calculate the pH, pOH, [H3O+], and [OH-] of the followingsolutions:(a) 0.001 M HNO3,(b) 0.3 M Ca(OH)2;(c) 3.0 M HNO3,(d) 6.0 M NaOH,(e) 0.05 M HBr
- Q Dozens of pharmaceuticals ranging from Cyclizine for motionsickness to Viagra for impotence are derived from the organiccompound piperazine. Solutions of piperazine are basic (Kb1 = 5.38x 10^-5, Kb2 = 2.15...
- Q A certain material's temperature increases by 1.0 C for every1560J that it gains. A 0.1964g sample of quinone (molar mass= 108.1g/mol) was burnt, and the surrounding material's temperatureincreased from 20.3C...
- Q Calculate the weight % of acetic acid in the vinegar. Calculateyour percent error. For this calculation, assume that the densityof vinegar is 1.01g/mL.0.8488 Molarity of acetic acid in my experiment.I'm...
- Q For the molecular compound carbon tetrabromide, what would youmultiply \"molecules of CBr4\" by to get the units \"grams ofCBr4\"?For the molecular compound carbon dioxide, what would youmultiply \"molecules of CO2\"...
- Q Sulfur (2.56 g) was burned in a constant volume calorimeter withexcess O2(g). The temperature increased from 21.25 °C to 26.72 °C.The bomb has a heat capacity of 923 J/K, and...
- Q For each solution, state the equation for the hydrolysisreaction that occurs and state the equation for the dissolution ofthe solid salt in water:1) HCl2) Fe(NO3)33) HC2H3O24) NaH2PO45) NH4Cl6) NaCl7) NH4C2H3O28)...
- Q What is the pH of a solution obtained by adding 50.0 mL of 0.100M NaOH (aq) to 60.0 mL of 0.100 M HCl (aq)?Select one:a. 11.96b. 2.04c. 3.11d. 7.00QUESTION 2What...
- Q A mixture of carbon dioxide and nitrogen gases, at a totalpressure of 889 mm Hg, contains 7.17 grams of carbon dioxide and5.38 grams of nitrogen. What is the partial pressure...
- Q 1a.Consider a neutral carbon atom that has six electronsorbiting the nucleus. Suppose that five of the electrons are intheir lowest states, but the sixth is in a very high state....
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