Chemistry question and answers for September 14, 2023
- Q It takes 41.0 min for the concentration of a reactant in afirst-order reaction to drop from 0.430 Mto 0.310 M at 25.0 oC. How long will it takefor the concentration...
- Q Which is not a valid quantum number for a ground state electron onan atom of germanium?a) n=2 l=1 ml=0 ms=+1/2b) n=4 l=3 ml=-2 ms=-1/2c) n=4 l=1 ml=-1 ms=+1/2d) n=3 l=0...
- Q 1) A 28.6 mL sample of 0.226 Mmethylamine,CH3NH2, is titrated with0.221 M nitric acid.After adding 11.5 mL of nitricacid, the pH is2) A 24.0 mL sample of 0.372 Mmethylamine,CH3NH2, is...
- Q EDTA: Dry Na2H2EDTA • 2H2O (FW 372.25) at 80 oC for 1 h and coolin the desiccator. Accurately weigh out 0.6045g and dissolve itwith heating in 400 ml of DI...
- Q From the following heats of combustion,CH3OH(l) + 3/2O2(g) → CO2(g) + 2H2O(l)       ΔHorxn=–726.4 kJ/molC(graphite) + O2(g) →CO2(g)                             ΔHorxn = –393.5 kJ/molH2(g) + ½O2(g) →H2O(l)                                                ΔHorxn = –285.8 kJ/molCalculate the enthalpy offormation of methanol...
- Q Determination of the Calcium Content of Beer and WaterUsing Atomic Absorption Spectroscopy1. Assuming the wort is saturated with Ca3(PO4)2(s), what wouldhappen to the concentration of Ca2+ions in the wort if:...
- Q A student is running an experiment in which 73.4 grams of BaI2is needed, but the only jar of reagent in the lab is labelledbarium iodide dihydrate. How many grams of...
- Q Consider the following reaction: COCl2(g) CO(g) + Cl2(g) If6.56×10-3 moles of COCl2, 0.377 moles of CO, and 0.372 moles of Cl2are at equilibrium in a 16.9 L container at 772...
- Q Consider the following reaction where Kp = 1.57 at 600 K: CO(g)+ Cl2(g) COCl2(g) If the three gases are mixed in a rigid containerat 600 K so that the partial...
- Q Part 1For each of the following compound names, determine if thename is correct according to the rules of naming outlined inChapter 8. If the name is correct, state \"correct\". If...
- Q Calculate the thermodynamic favorability of aerobic Mn(II)oxidation and aerobic Fe(II) oxidation at pH 2 and 7. Is it likelythat an organism could get “enough†energy to grow from each ofthese...
- Q If you can read at an average rate of 5.15 words per second,how long will it take you to read a 505 page book that has anaverage of 995 words...
- Q Using the Cu-Ni phase diagram (Callister, Chap.9, pp. 288)estimate the following quantities for a nominal   composition of 55%Ni – 45% Cu:a) Liquidus Temperature,b) Solidus Temperature,c) The composition of the liqiud and...
- Q Under anaerobic conditions, ethanol (CH3CH2OH) is produced bythe reduction of acetaldehyde (CH3COH) by molecular hydrogen (H2).Free energy of formation (Gf°, kJ/mol): acetaldehyde, -139.9;ethanol, -181.75.a. Write a balanced stoichiometric equation for...
- Q I would really appreciate it if you could explain this problemstep by step, in as much detail as possible, as Iam having a difficult time trying to understand it. Thank...
- Q Consider the titration of 42.8 mLmL of 0.265 MM HFHF with 0.185MM NaOHNaOH. Calculate the pHpH at each of the followingpoints.Part AHow many milliliters of base are required to reach...
- Q Arrange the 0.15 M solutions of thefollowing compounds in order of increasing acidity (least acidicfirst).NH4I               B.CH3COONH4         C.CH3COOK          D.KCl                E.CH3COOH                  F.KF                  G.HBr                         H.CHCl2COOH       I.NH3                 J. CF3COOH     ammonia,   Kb = 1.80
- Q 1. Distinguish between reverse phase and normal phaseseparations. 2. What is the dynamic range for absorbancespectroscopy? What is the dynamic range for fluorescencespectroscopy? Which has the lowest LOD and why?...
- Q A). A mixture of methane and argon gases is maintained in a 8.34L flask at a pressure of 2.24 atm and a temperature of 66 °C. Ifthe gas mixture contains...
- Q Calculate the molar solubility of magnesium fluoride in each ofthe following solutions:a) pure waterb) 0.010 M potassium fluoride solutionc) 0.050 M solution of magnesium nitrated) Why are the results of...
- Q At a certain temperature, 0.4011 mol of N2 and 1.581 mol of H2are placed in a 1.50L container. N2(g) + 3H2(g) −⇀↽− 2NH3(g) Atequilibrium, 0.1401 mol of N2 is present....
- Q What is the key difference in the biosynthesis of purineribonucleotides vs. the biosynthesis of pyrimidineribonucleotides?
- Q A 1.000-L vessel contains a mixture of hydrogen, carbon monoxideand methane gases in unknown proportions at 23.3-bar and 25 °C. Thegaseous mixture is found to have a mass of 13.70-g...
- Q EXAMPLES OF THERMODYNAMIC STATE FUNCTION WITH DEFINITION
- Q what intermolecular forces are present in each of thesubstances?
- Q Consider the titration of 65 mL of 1.75 M diethylamine,(CH3CH2)2NH (Kb = 1.3×10-3) with 0.25 M HCl. How many mL of HClwill need to be added to the diethylamine solution...
- Q a.  Unhealthy exhaust results from the combustion ofoctane (C8H10) in automobile engines via the followingreaction.C8H18(l) + 25O2(g) ïƒ 16CO2(g) + 18H2O(g)Assuming the gasoline is pure octane and that a suburban dwellerburns...
- Q What is the pH of a solution that is 1.3 M NH3? ( Ka=5.70 x10^-10 for NH4+).
- Q Determine the pH of each of the following two-componentsolutions.0.270 M NH4NO3 and 0.100 M HCN8.0×10−2 M RbOH and 0.120 M NaHCO38.2×10−2 M HClO4 and 2.2×10−2 M KOH0.110 M NaClO and...
- Q Briefly explain how aqueous base can cause some water-insolublecompounds to become water-soluble. (b) Answer the same question foraqueous acid.
- Q For each of the following molecules, predict the molecularshape, give bond angles, hybridization and determine whether themolecule will be polar or non-polar.a. CF4b. BeH2c. SeF6d. XeOF2
- Q Calculate the total pressure at equilibrium when 0.35 atm ofphosphorus pentafluoride dissociates according to the equationbelow at 288 K, if Kc = 1.7 × 10–6 . PF5(g) PF3(g) + F2(g)
- Q What is the amount of energy emitted in KJ from aphoton given off by a sulfur atom with a wavelength of 702.3nm?
- Q What is happening to the electron relative to the nucleus when?E=0? ?E>0? ?E<0?
- Q At a certain temperature, 0.900 mol SO3 is placed in a 5.00 Lcontainer.2SO3(g)−⇀↽−2SO2(g)+O2(g)At equilibrium, 0.110 mol O2 is present. Calculate Kc.
- Q A lab technician is trying to prepare 100. mL glucose solutionwith a concentration of 5.0% by mass for a clinical trial. How manygrams of glucose should he use to prepare...
- Q The data shown below were collected for the followingsecond-order reaction:Cl(g)+H2(g)→HCl(g)+H(g)Cl(g)+H2(g)→HCl(g)+H(g)Temperature (K)(K)Rate Constant (L/mol⋅s)(L/mol⋅s)900.003571000.07731100.9561207.781A)Use an Arrhenius plot to determine the activation barrier forthe reactionB)Use an Arrhenius plot to determine the frequency...
- Q Suppose that you have 0.500 L of each of the followingsolutions, and an unlimited supply of water. Kb= 6.3×10−5fortrimethylamine, (CH3)3Nand Ka= 1.9×10−5for hydrazoic acid, HN3.0.114mol L−1(CH3)3N(aq) 0.124 mol L−1HN3(aq) 0.102mol...
- Q Find the pH of 0.190M NaCN solution. For HCN,Ka=4.9?10?10.
- Q Ifan average veichle has a 14 gallon tank and octane used as fuelundergoes complete combustion(Only Co2 and H20 are products)howmany liters of Co2 will be emitted in the air at...
- Q what is the molarity of a KOH solution if 24.6 ml neutralizes 44.0mL of a 0.211 M HCI?
- Q An unknown gas contains 85.63% carbon and 14.37% hydrogen bymass. if 2.00 L of the gas at 298 K and 0.420 atm and weights 1.926gA) What is the molar mass...
- Q In the lab manual you are required to keep a 2 – 3 mm layer ofacetone and then add water. A student vaporized the acetoneabsolutely and state that he can...
- Q From the standard reduction potentials in Table 11.1 in theAppendix, calculate the standard cell potential and the equilibriumconstant at 298.15 K for the following reactions:(a) 4 NiOOH(s) + 2 H2O(l)...
- Q In a particular solution, acetic acid is 11% ionized at 25°C.Calculate the pH of the solution and the mass of acetic acid(Ka=1.8x10^-5) dissolved to yield 1.00 L of solution.pH =...
- Q 1. The coordination number of a metal atom in a close-packedstructure is?2. The coordination number of a metal atom in a BCC structureis?3. The coordination number of an atom in...
- Q You are preparing triphenyl carbinol by a grginard synthesis.First you prepare methyl benzoate, and set aside 4.40 grams of thepurified ester for later use. You then prepare the grignard reagent(...
- Q Explain the relationship between light absorbance and solutionconcentration for a solution which obeys the Beer-Lambert law.
- Q What is the pH of the solution made by mixing 0.2 mol NaH2PO4and 0.5 mol NaOH with water to make 1.00 L of solution? The pKavalues for H3PO4 are 2.12...
- Q Calculate the enthalpy of oxidation per mole for N2and for C2H2 (the enthalpy of formation ofN2O5(g) is 11.30 kJ/mol).
- Q What is the pH p H change of a 0.200 M M solution of citric acid(pKa=4.77 p K a = 4.77 ) if citrate is added to a concentration of0.140...
- Q 4) Formic acid (
- Q What is the differences between :Mass-to-charge ratioCharge-to-mass ratioCharge-to-size ratioI'm confused about these three terms ?
- Q (a) Let us consider CH4 combustion in air with an equivalenceratio of 0.9, where we have air flow rate of 400 kg/s. (1)calculate the required flow rate of CH4 (in...
- Q Two proteins with totally different primary structures arecapable of binding calcium ions with very high affinity andselectivity. Give an explanation as to why two such proteins, withvery different primary structures,...
- Q Determine the percent yield for anacid/base reaction that involvesmixing 500. mL of 0.100 molar nitric acid with 500. mL of 0.0500molar barium hydroxide and a 0.00200 molar solution of bariumnitrate...
- Q Design a protocol with a list of glassware needed andcalculations to prepare a 100-mL homogeneous solution of HCl/FeCl3with 0.025 M of FeCl3 and 0.10 M of HCL.The following reagants are...
- Q Mobile charges of the following (if any):Copper wire, Plastic, Sodium Carbonate, Aluminum Foil, Wood,Glass, Silver Wire, Graphite, Potassium Chloride, Lead, Silicon,Potassium accetate (solid), Potassium accetate (liquid), Dime,Sulfur, Sugar, Penny, Celery,...
- Q A 4.10 −g sample of a mixture of CaO and BaO is placed in a1.00-L vessel containing CO2 gas at a pressure of 735 torr and atemperature of 26 ∘C....
- Q Using standard reduction potentials, calculate the standard emf,free energy, and equilibrium constant at 298K for each of thefollowing reactions:a. Cl2(g) + 2 I-(aq) → 2 Cl-(aq) + I2(s)b. 2 NO3-(aq)...
- Q 1.Calculate the approximate pH of the following aqueous solutionsat 25C. (Note: consider one decimal place for the pH answer.)a) H3PO4 (0.20 M),(pKa1=2.15, pKa2=7.15,pKa3=12.38)b) Na2CO3 (0.20 M),(pKaH2CO3/HCO3? = 6.35, pKaHCO3?/CO32? =10.30)c)...
- Q In one page, write a short summary on a scientist who studied a kinetic process in any field (chemistry, biology, medicine…etc.)and the theory related to it.
- Q Research shows that GC analysis of the tert-butyl halides may bediffcult because the products may undergo elimination during theprocess. What would be the product of the elimation? show work andexplain...
- Q What is the pH of 0.005 M Ba(OH)2 solution?a) 12b) 2c) 0.005d) -2
- Q Write the balanced chemical equation for the dissolving ofcopper carbonate in water, and write its equilibrium expression.Calculate the concentration of copper in the saturated solutionusing the experimental cell potential (0.21...
- Q 1a) Linolenic acid (C18H30O2) can be hydrogenated to stearicacid by reacting it with hydrogen gas according to theequation:C18H30O2 + 3H2 → C18H36O2What volume of hydrogen gas, measured at STP, is...
- Q Determine the limiting reagent and calculate the theoreticalmass of aluminum sulfate formed and the volume of hydrogen gas at23oC and 752 mm Hg formed if 10.00g of aluminum isreacted with...
- Q Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â INTEGRATED SELF DIRECTEDWORKÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â INSTRUCTIONSPrepare a report and submit asper the deadline.References should be Harvard style.Report must be submitted as per the deadline.Case:A mixture containing 45% benzene (b) and 55% toluene (t)...
- Q What is the pH at the equivalence piont in the titration of 25mL of .10 M HOAc with .1 M NaOH? Ka= 1.8x10^-5?Please show work?
- Q An ethylene glycol solution contains 24.6 g of ethylene glycol(C2H6O2) in 89.8 mL of water. (Assume a density of 1.00 g/mL forwater.)a. Determine the freezing point of the solution in...
- Q An aqueous solution contains 0.352 Mmethylamine(CH3NH2).How many mL of 0.309 M hydrobromicacid would have to be added to 150 mL ofthis solution in order to prepare a buffer with a...
- Q Problem 9.19Aqueous ammonia is commercially available at a concentration of16.0 M.Part AHow much of the concentrated solution would you use to prepare400.0 mL of a 1.70 M solution?
- Q Which solution has the highest pH?a. 0.10 M NaF(aq)b. 0.10 M NaCl(aq)c.  0.10 M NaBr(aq)d. 0.10 M NaClO4(aq)
- Q Select all of the correct statements aboutreaction quotients and equilibrium constants from the choicesbelow.A reaction quotient equals the equilibrium constant atequilibrium.K changes as temperature changes, but is independent ofconcentrations.If Q...
- Q Explain the role that conformation angle plays in the mechanicalbehavior of amorphous polymer materialsNeed help with this question. Correct answer will be rated 5stars
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