Chemistry question and answers for July 04, 2023
- Q How would you prepare 250ml of 0.035M sodium sulfate solution?Describe steps starting from calculating amount of sodium sulfateto final volume. What is the ionic strength of this solution(assuming the salt...
- Q Calculate deltaS total for the isothermal irreversible freeexpansion of 1.00 mol of ideal gas from 8.0 L to 20.0 L at 298K
- Q Suppose 25.00 mL of 0.0500 M CH3NH2(Kb = 4.4 × 10-4) is titrated with 0.0625 MHCl.How many millimoles of CH3NH2 are presentinitially?How many millimoles of HCl are required to reach...
- Q At a certain temperature, the Kp for the decomposition of H2S is0.842.Initially, only H2S is present at a pressure of 0.126 atm in aclosed container. What is the total pressure...
- Q An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) haspartial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr,respectively. A quantity of Cl2(g) is injected into the mixture,and the total pressure...
- Q You want to decaffeinate your coffee by extracting the caffeineoutwith dichloromethane. It's too late to extract the caffeinefromthe coffee beans because you've already brewed yourself a 200mL cupof coffee. Your...
- Q Find ∆H and ∆S for the following data.Calculate percent errors for the enthalpy and entropy ofreaction using the following literature values: ∆H = 110 kJ/mol, ∆S= 380J/mol*KStandardized HCl = .5087MKsp...
- Q “Dry air†is defined as air with no water vapor, and themolecular weight of air, Mair = 28.97 kg/kmol, is for dry air (zerohumidity). “Wet air†is typically defined as...
- Q Carbon fossil fuels are utilized to power our vehicles, makeoil, and even t-shirts. The EPA has determined that a cartransforms a gallon of octane (C8H18) to 33.7 kWh (kilowatt*hours,an expression...
- Q The boiling point of an aqueous solution is 102.34 °C. What isthe freezing point?
- Q Explain how the internal entropy of a biomolecule can beapproximated by S = k ln w
- Q Balance this redox by half reaction methodKIO4 + KI + ? KCl + I2Please show the steps and detail along the way
- Q describe how a human body and its processes act like a voltaicand electrolytic cell?
- Q Calculate the frequency of the light emitted when an electron ina hydrogen atom makes each of the following transitions. Express ininverse seconds.a) n=4?n=3b) n=5?n=1c) n=5?n=4d) n=6?n=5
- Q Part BThe amount of boiling water required to raise the temperature of25.0 kgof water in the bath to body temperature is 4.80 kg.In this process, the heat lost by the...
- Q Suppose that a 10-mL sample of a solution is to be tested for I−ion by addition of 1 drop (0.2 mL) of 0.10 M Pb(NO3)2.What is the minimum number of...
- Q Propanol- C3H7OH- Determine the ratio of atoms ofCarbon per total atoms, Hydrogenper total atoms and Oxygen per total atoms.
- Q Synthesis of zinc iodideHow well do your results agree with the law of conservation ofMass ( use percent difference to compare)% composition of Zn and I:Convert mass Zn to molesConvert...
- Q Balance the following redox equations and show work:a)Â Â Â Â Â Â Â Â H2S + Hg22+------>Hg + S + H+b)Â Â Â Â Â Â Â Â Zn + BrO4-+ OH-+ H2O ------>[Zn(OH)4]2- + Br -c)Â Â Â Â Â Â Â Â MnO4- +S 2-+H2O ------->MnO2+ S +OH -d)Â Â Â Â Â Â Â Â Cu + H...
- Q I do not know how to solve this problem.A manufacture in Ontario has been fined because it has beenreleasing 5 L/s effluent havingzinc concentration of 0.1 mg/L into a river....
- Q How do we solve this?Consider the air over a city (60x25 km). Wind with 18 km/hrspeed brings the fresh air intothe city from the west side of the region (25...
- Q The integrated rate laws for zero-, first-, and second-orderreaction may be arranged such that they resemble the equation for astraight line,y=mx+b.OrderIntegrated Rate LawGraphSlope0[A]=−kt+[A]0[A] vs. t−k1ln[A]=−kt+ln[A]0ln[A] vs. t−k21[A]= kt+1[A]01[A] vs. tk1)...
- Q organic semiconductors: I've read a couple of articlesand some imply that tunneling and hopping are essentially the sameand others state differently. can someone please explain
- Q What is the lead (II) ion concentration in a solution preparedby mixing 413 mL of 0.385 M lead (II) nitrate with 447 mL of 0.263M sodium fluoride? The Ksp of...
- Q Calculate the pH of a 0.45M solution of Benzonic Acid. (Use thequadratic equation to solve).
- Q 1. Given the equilibrium: SO2Cl2(g) ïƒŸïƒ SO2(g) + Cl2(g) Kp = 3.60at 125 °C Is this reaction at equilibrium under the followingconditions. If the reaction is not at equilibrium state...
- Q Please I need all answers about questions in TLC LAB.(Q1) In our lab, what is the mobile phase and what is stationaryphase? Discuss the polarity of each.(Q2) Do your results...
- Q Acid Base QuestionsPART 1: For 500.0 mL of a buffer solution that is 0.150M in CH3CH2NH2 and 0.135 M in CH3CH2NH3Cl,calculate the initial pH and the final pH after adding...
- Q Calcium dihydrogen phosphate, Ca(H2PO4)2, and sodium hydrogencarbonate, NaHCO3, are ingredients of baking powder that react witheach other to produce CO2, which causes dough or batter torise:Ca(H2PO4)2 (s) + NaHCO3 (s)...
- Q The formation of methanol is important to the processing of newfuels.At 298.0 K, Kp = 2.25 × 104 for the reactionCO(g) + 2 H2(g) ⇌ CH3OH(l)If ΔH o rxn =...
- Q Experiment: Studying the Rate of the Reaction of PotassiumPermanganate and Oxalic AcidBRIEFLY EXPLAIN THE MEANING OF THE FOLLOWING TERMS AS THEYPERTAIN TO THIS EXPERIMENT.A. REACTION RATEB. RATE EQUATIONC. RATE CONSTANTD....
- Q For a particular isomer of C8H18, the combustion reactionproduces 5104.1 kJ of heat per mole of C8H18(g)consumed, under standard conditions.C8H18(g)+252O2(g)⟶8CO2(g)+9H2O(g)Δ?∘rxn=−5104.1 kJ/molWhat is the standard enthalpy of formation of this isomer...
- Q For a particular isomer of C8H18, the following reactionproduces 5108.7 kJ of heat per mole of C8H18(g) consumed, understandard conditions.C8H18(g)+12.5O2(g)-->8CO2(g)+9H2O(g)deltaHrxn=-5108.7What is the standard enthalpy of formation of this isomer ofC8H18(g)?delta...
- Q How do you calculate the mass of the weak acid NaH2PO4 and thevolume of the base NaOH that are needed to prepare a 50.00 mLbuffer?Note: target pH = 7.50, target...
- Q For a particular isomer of C8H18,C8H18, the combustion reactionproduces 5093.7 kJ5093.7 kJ of heat per mole of C8H18(g)C8H18(g)consumed, under standard conditions.C8H18(g)+252O2(g)⟶8CO2(g)+9H2O(g) ΔH∘rxn=−5093.7 kJ/molWhat is the standard enthalpy of formation of...
- Q Place the following in order of decreasing X-A-X bond angle,where A represents the central atom and X represents the outeratoms in each molecule. hcn h2o h3o+(Please explain how to figure...
- Q Write Lewis structure, molecular designation, molecular shape,ideal bond angle, number of bonding electron pairs, number ofelectron lone pairs in the following molecules:a. [6 pts] COBr2.b. [6 pts] [H3O]+.
- Q Place the following in order of increasingX-A-X bond angle, where A represents the central atom and Xrepresents the outer atoms in each molecule.HCN H2O H3O+show all details.
- Q In the following molecules, predict the geometry, hybridization,and bond angle for the central atom. Give your answer usingdrawings.a)H3OÂ 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 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 b)BeCl2Â 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 Â c) BCl3
- Q Determine the VSPER formula, electron geometry, molecular geometry, and bond angle for the following molecules/polyatomic ions listed below. 1. H3O+
- Q Solid diiodine pentoxide reacts with carbon monoxide gas to formsolid iodine and carbon dioxide gas.How much solid iodine is produced when 50.0 g of diiodinepentoxide reacts with excess carbon monoxide?
- Q Identify the correct name for CI2O5. dichlorine pentoxide dichloride pentoxide dichlorine tetroxide diiodine pentoxygen
- Q Balance the following reaction. Â If we start with 34.1 g of diiodine pentoxide and react with 20.0 g of carbon monoxide, what is the theoretical yield of iodine and what...
- Q Determine the oxidation state for each of the elementsbelow.The oxidation state of...iodine...in...diiodine pentoxideI2O5...is...___ .The oxidation state ofsulfurinsulfur trioxideSO3is__The oxidation state ofbromineinbromine trifluorideBrF3is___.
- Q The following equilibrium is exothermic. How could the yield ofdiiodine pentoxide be increased? I2(g) + 5CO2(g) < --> 5CO(g)+ I2O5(g)A. by decreasing the pressureB. by increasing the pressureC. by decreasing...
- Q Why does H2Ohave a smallerbondangle thanH3O+?
- Q The bond angles around the central atom in each structure areslightly different, however. The H-C-H bond angle in CH4is 109.5., the H-O-H bond angle inH2O is about 104.5., and theH-O-H...
- Q Which species has the smaller bond angle, H3O+ or H2O? PleaseExplain how this works out
- Q ___ FeCl3 (aq) + ___ NaOH (aq) -->Fe(OH)3 (___) + ___ NaCl (___)Balance the reaction, and enter phases for the products. Youdo not need to submit this for this assignment,...
- Q Balance the following eqautions:Fe(s) + S(s) -> FeS(s)H2SO4(aq) + NaOH(aq) ->Na2SO4(aq) +H2O(I)Cu(s) + O2(g) ->Cu2O(s)FeCl3(aq) + NaOH(aq) ->Fe(OH)3(s) + NaCl(aq)
- Q FeCl3(aq) + 3NaOH (aq)---- Fe(OH)3(s) + 3NaCl(aq)Is this aredox reaction in the reaction above? Explain.
- Q During design of a chemical water treatment plant it is required to determine the amount of ferric chloride (FeCl3) to remove 40 Kg of sodium hydroxide (NaOH). Calculate the amount...
- Q 1. Can 0.250 mol NaOH consume all of the available FeCl3 (0.308mol)? FeCl3(aq) + 3 NaOH(aq) ? Fe(OH)3(s) + 3 NaCl(aq)2. Now consider the reaction when 45.0 g NaOH have...
- Q Match the following molecules with the types of bonds in thespace provided. (_____)a. (Answer_____) PH3   b. (Answer_____) AlCl4-c. (Answer_____) CH3F`d. (Answer_____) HC≡CNa (C-Na)e. (Answer_____, _____) H2C=O (C-O) & (C-H)f. (Answer_____)...
- Q Match the following molecules with the types of bonds in thespace provided. (_____)a. (Answer_____) PH3 b. (Answer_____) AlCl4- c. (Answer_____)CH3F d. (Answer_____) HC≡CNa (C-Na) e. (Answer_____, _____) H2C=O(C-O) & (C-H)...
- Q Draw and name the strongest intermolecular force between thefollowing molecules:1. CH3OH and H2O2. CH3F and H2O3. CH3F and CH3F
- Q Arrange the following in order of expected increasing melting point. CH3NH2, N2, MgO, CH3F CH3F, N2, MgO, CH3NH2 MgO, N2, CH3F, CH3NH2 N2, CH3NH2, CH3F, MgO MgO, CH3NH2, CH3F, N2  N2, CH3F, CH3NH2, MgO
- Q Which of the following has been arranged in order of decreasingdipole moment?(a)CH3Cl>CH3F>CH3Br>CH3I(b)CH3F>CH3Cl>CH3Br>CH3I(c)CH3Cl>CH3Br>CH3I>CH3F(d)CH3F>CH3Cl>CH3I>CH3Br
- Q Calculate the concentrations of all species in a 0.300 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.
- Q An industrial wastewater flowing at a rate of 37,000 m3/day iscontaminated by 187 mg/L of propanol – CH3CH2CH2OH. As anenvironmental consultant, you propose to treat the water in anactivated sludge...
- Q For each of the following: draw the Lewis structure (use o whenever possible), name the molecular shape, and indicate if it is polar or nonpolar. a. SBr2 b. BrH3 c. SiF4...
- Q What does electronegativity measure?What makes a bond polar?Indicate which bonds are polar in the molecules below bydrawing their Lewis structure and drawing in dipole moments. If itis non-polar write N/A.CH3F                    b.HOCl               c.Br2                  d.CH3CH3           e....
- Q Part ACalculate the vapor pressure for a mist of spherical waterdroplets of radius 2.30×10−8 m at 298 K. The vaporpressure of water at this temperature is 25.2 Torr.Part BCalculate the...
- Q The reversible chemical reactionA+B⇌C+Dhas the following equilibrium constant:Kc=[C][D][A][B]=3.4Initially, only A and B are present, each at 2.00 M.What is the final concentration of A once equilibrium isreached?What is the final...
- Q How to prepare a 100mL buffer solution of pH 8.5 using glycineand sodium hydroxide ?
- Q 1. How would you prepare 100 mL of F- solutions withthe following concentrations: (A) 10.0 ppm, (B) 5.00 ppm, (C) 0.500ppm and (D) 0.100 ppm. What is this experimental protocol...
- Q Which of the following will produce the solution with the lowestpH?(A) 0.2 M HCl(B)Â Â 0.5 M HF(C)Â Â 0.2 M KOH(D)0.5 M HClO4(E)Â Â There is not enough information topredicTplease help? im kind of lost
- Q There are two molecules with the formula C2H6O. Drawelectron-dot structures for both. (Hint: The connection of atoms isdifferent in the two structures.)Draw the molecule by placing atoms on the grid...
- Q Suggest at least 3 solutes for each of these solvents that showsthe maximum freezing point depression in their solution aftermixing them. Solvents: Water, Acetone, Heptane, Toluene
- Q Use solubility rules and other properties to separate the givenions (Ba2+, Ag+, and Fe3+)Ba2+, Ag+, and Fe3+ mixed inone beaker. Real compounds dissolved:Ba(NO3)2, AgNO3 andFe(NO3)3; 0.1 mol/L for all.You may...
- Q For the diprotic weak acid H2A, Ka1 = 3.2 × 10^-6 and Ka2 = 8.0× 10^-9. What is the pH of a 0.0600 M solution of H2A? What are theequilibrium...
- Q 1. Calculate the fraction of association (α) for thefollowing concentrations of sodium butanoate. (AssumeKa = 1.52 ✕ 10−5 andKw = 1.01 ✕ 10−14. Enter unroundedvalues.)(a)    1.04 ✕ 10−1M  (b)    1.04 ✕ 10−2M(c)    1.04 ✕ 10−12M2.How many milliliters of 0.248 M HNO3should be added to...
- Q Ferric chloride is used as a coagulant for drinking watertreatment. It reacts with bicarbonate to form iron hydroxideprecipitate as follows: FeCl3•7H2O + HCO3- ↔ Fe(OH)3(s) + CO2 + Cl-+ H2O(a)...
- Q Some textbooks assert that histidine can provide bufferingcapacity at the physiological pH of 7.4.a) Is this assertion correct?b) What are the unprotonated (base) and protonated (acid) formsof histidine that would...
- Q At one time, nuclear bombs were tested by exploding themaboveground. The fallout from such tests contained some Sr-90, aradioactive isotope of strontium. If Sr-90 gets into the foodsupply, it can...
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