Chemistry question and answers for July 18, 2023
- Q What is the pH of 0.213 M NaF(aq)?HF: Ka = 7.2 * 10-4Answer is 8.24
- Q An organic compound contains C, H, N, and O. Combustion of0.3069 g of the compound produces 0.8301 g CO2 and 0.2975 g H2O. Asample of 0.5322 g of the compound...
- Q calcium in powdered milk is determined by ashing a 1.50g sampleand then titrating the calcium with EDTA soluton, 12.1mL beingrequired. The EDTA was standardized by titrating 10.0mL of a zincsolution...
- Q An organic compound contains C, H, N, and O. Combustion of0.3069 g of the compound produces 0.8301 g CO2 and 0.2975 g H2O. Asample of 0.5322 g of the compound...
- Q Calcium hydride, CaH2, reacts with water to form hydrogen gas:CaH2(s)+2H2O(l)→Ca(OH)2(aq)+2H2(g) This reaction is sometimes usedto inflate life rafts, weather balloons, and the like, where asimple, compact means of generating H2...
- Q The ideal gas law PV=nRT relates pressure P, volume V,temperature T, and number of moles of a gas, n. The gas constant Requals 0.08206 Lâ‹…atm/(Kâ‹…mol) or 8.3145 J/(Kâ‹…mol). The equation...
- Q Rank the polarity of the following compounds:ferrocenecarboxylic acid, acetylferrocene, ferrocenecarboxaldehyde,ferrocene, (dimethylaminomethyl) ferrocene, and ferrocenemethanoland give a detailed explanation why.
- Q Engineers in Brazil do not have to worry as much about the CLOUDPOINT or the POUR POINT of their biodiesel as Canadian engineersdo. Define these terms and suggest two ways...
- Q A 50/50 blend of engine coolant and water (by volume) is usuallyused in an automobile\'s engine cooling system. If your car\'scooling system holds 5.60 gallons, what is the boiling point...
- Q Experiment 1: Determining the Chemical Formula for CopperGluconate The experiments in this lab use a compound named coppergluconate. This compound can be formed when gluconic acid (C6H12O7)and copper solutions react...
- Q Calculate the appropriate amount of 28 wt% aqueous NH3 and solidNH4Cl to be mixed together to yield 500 ml of a ~0.2 M pH 10buffer. Check with pH paper. Store...
- Q Lab: Spectroscopy and Qualitative Analysis in theDetermination of an Unknown Iron SaltProcedurePart A:Obtain one of the provided kits and inspect for completeness(see available list in the laboratory). Ask your instructor...
- Q Hi,in steam distillation when you get near to the end where you addsmall piece of sodium chloride to increase the ionic bond to makeit more polar. I want to know...
- Q Consider the reaction A+2B⇌C whose rate at 25 ∘C was measuredusing three different sets of initial concentrations as listed inthe following table: Trial [A] (M) [B] (M) Rate (M/s) 1...
- Q Q. A certain amino acid has the following elemental composition:C, H, O, N. In a combustion analysis, 3.263g of it was combusted toproduce 5.910g of CO2 and 2.835g of H2O....
- Q What does it mean to calculate the average value of the rateconstant from the four data sets ? What is average value of therate constant. What does this mean??This is...
- Q Calculate [H30+] and [S2-] in a 0.1 M solution of the diproticacid hydrosulfuric acid. (For hydrosulfuric acid Ka1 = 9.0 times10-8 and Ka2 = l.OxlO-17.) Enter your answers in scientificnotation....
- Q A sample of solid Ca(OH)2 was stirred in water at a certaintemperature until the solution contained as much dissolved Ca(OH)2as it could hold. A 78.7-mL sample of this solution was...
- Q 1) Write the net ionic equation for the equilibrium that isestablished when ammonium iodide is dissolved in water. (Use H3O+instead of H+.) This solution is acidic, basic or neutral?2)Write the...
- Q In the following reaction, 451.4 g of lead reacts with excessoxygen forming 321.9 g of lead(II) oxide. Calculate the percentyield of the reaction. 2Pb(s)+O2(g)-->2PbO(s)
- Q Determine the pH of a solution after 20.00 mL of 0.4963 M HI hasbeen titrated with 12.64 mL of 0.5174 M NaOH.
- Q Heat CapacityLearning Goal:To understand the concepts of heat capacity, specific heat, andmolar heat capacity.Heat capacity, C, is the amount of energy required toraise the temperature of a substance by exactly...
- Q On a cold, dry morning after a frost, the temperature was -5Cand the partial pressure of water in the atmosphere fell to 0.30kPa. Will the frost sublime? What partial pressure...
- Q You prepare a buffer solution from 10.0 mL of 0.100 M MOPS(3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.079 M NaOH.Next, you add 1.00 mL of 5.67 × 10^-5 M lidocaine...
- Q When is it necessary to use a vacuum distillation? Give someexplanation and provide examples
- Q write the complete mechanism for the preparation of bananaoilwhy do you use sulfuric acid in the reactionexplain why we used simple distillation in order to isolate ourproduct. Describe what is...
- Q Suppose a 3.00 L nickel reaction container filled with0.0072 M H2 is connected to a 3.00 L container filled with 0.247 MF2. Calculate the molar concentration of H2 atequilibrium.-Hint, find...
- Q Preparation of CuClReactions: 1) Cu(S) + 4HNO3(aq) -> Cu(NO3)2(aq) + 2NO2(g) +2H2O(l) 2) 2HNO3(aq) + Na2CO3(s) -> H2O(l) + CO2(g) + 2NaNO3(aq)3)Cu(NO3)2(aq) + Na2CO3(s) -> CuCO3(s) + 2NANO3(aq) 4)CuCO3(s) +2HCL(aq)...
- Q Bright colors in organic molecules is usually due toextensive conjugationnitrogenimpuritieslong alkyl chains
- Q boiling point elevation of a solution containing 2.94 g sodiumchloride and 114 g water
- Q Question 1 Given the pair of reactions shown with theequilibrium constants, PCl3(g) + Cl2(g) ⇌ PCl5(g) K1 2 NO(g) +Cl2(g) ⇌ 2 NOCl(g) K2 What is the equilibrium constant for...
- Q If you are given the followingsolids:Na3PO4             MW= 163.94 g/molK3PO4                MW = 212.26 g/mol   NaH2PO4          MW = 119.98 g/molK2HPO4           MW = 174.17 g/molNa2HPO4          MW = 141.96 g/molKH2PO4            MW = 136.08 g/molWhich compounds would you use toprepare your...
- Q The Ksp for M2X2, a slightlysoluble ionic compound is 4.5 x 10-29. The electronconfiguration of M2+2 is preparedXe6s15d104f14. The X-anion has 54 electrons. What is the molar solubility ofM2X2 in...
- Q abstract on how to isolate a spice essence and whattechniques used to characterize it
- Q describe steam distillation and it's advantages andlimitations
- Q A fuel gas containing methane and ethane is burned with air in afurnace, producing a stack gas at 300.°C and 105 kPa (absolute).You analyze the stack gas and find that...
- Q Determine what is the temperature of the hot combustion gas thatis produced in the engine of a butanol (C4H9OH)-burning bus thatuses ambient air for the combustion. Tip: write the balancedstoichiometric...
- Q write structural formulas of each fragment andmolecular ion on the ms spectrum of anise
- Q why did some particles pass through the foil undeflected.why did some particles pass through the foil and get partiallydeflectedwhy did some particles hit the foil and deflect backwards
- Q Consider the following reaction: 2NO(g)+O2(g)→2NO2(g) EstimateΔG∘ for this reaction at each of the following temperatures andpredict whether or not the reaction will be spontaneous. (Assumethat ΔH∘ and ΔS∘ do not...
- Q what mass of Ca(NO3)2 must be added to 1.0L of a 1.0 M HF solution to begin precipitation of CaF2.You may assume no volume change on the addition ofCa(NO3)2. Ksp...
- Q Solid HgO, liquid Hg, and gaseous O2 are placed in a glass bulband the reaction below is allowed to reach equilibrium.2HgO(s)2Hg(l) + O2(g); ΔH = +181.6 kJWith the system at...
- Q Carbon disulfide and chlorine react according to the followingequation: CS2(g) + 3Cl2(g) S2Cl2(g) + CCl4(g) When 2.94 mol of CS2and 5.60 mol of Cl2 are placed in a 2.00-L container...
- Q 1. Explain the issue on either increasing or decreasing thenumber of nuclear reactors used for generating energy in theUS.2.A number of European countries that lack access to oil and gasreserves...
- Q i have data, Acid is HCl and base is NaOHâ–³H=mCh2o(Ti-Tf)i am looking for the mass(m) please explain this..VacidVbaseCacidCbaseTiTf50 mL50 mL1.0 M1.0 M22.4 C30.4 C
- Q A solution is prepared by mixing 50 mL of 1 M Pb(NO3)2 and 75 mLof .5 M NaF. Calculate the concentration of F- ions present atequilibrium. (Hint: First, write and...
- Q 1.How many mL of 0.500 M HCl should be added to 155 mL of 0.0500M benzylamine to form a buffer with pH = 8.52? C7H7NH2 pKb = 4.35C7H7NH2 (aq) +...
- Q A solution is prepared by mixing 100 mL of .01 M Pb(NO3)2 and100 mL of .001 M NaF. Will PbF2(s) precipitate in this reaction?Calculate the concentration of F- ions present...
- Q 11. Use equations (9.15), (9.22) and(9.23) to construct a concordia diagram for 3500 Ma of Earthhistory. Begin with 1000 atoms each of 235U and238U at an initial time of 0...
- Q hypophosphate ion(H2PO2-) decomposes in alkaline solution as aresult of the folowing reaction.H2PO2-+OH-----HP032-+H2the kinetic of this reaction were bstudied at 100 deg c.thefollowing table lists the initial concentations of thereactants(from three...
- Q Tell how UV-vis spectrometry can be used to differentiate thefollowing compounds. Calculate approximate ymax values for eachcompound when you can.a) 1,4 hexadiene, 2,4-hexadiene, and 1,3 hexadieneb) cyclohexanone, 2-cyclohexenone, and 2,4-cyclohexadienone
- Q 1.A mixture of argon and xenongases contains argon at a partial pressure of450 mm Hg and xenonat a partialpressure of 523 mm Hg. What is the mole fractionof each gas...
- Q The solubility of CO2 in a salt water lake at 298 K and 750 torrpressure was found to be 1.0 x 10-5 moles CO2/liter of aqueoussolution. The Henry’s Law constant...
- Q The distinctive odor of vinegar is due to acetic acid, CH3COOH,which reacts with sodium hydroxide in the following fashion:CH3COOH(aq)+NaOH(aq)→H2O(l)+NaC2H3O2(aq)1.) If 3.55 mL of vinegar needs 43.0 mL of 0.150 M...
- Q What is the pH at the quivalence point when 50.0 mL of 0.10 Methylamine (C2H5NH2) is titratedwith 0.20 M HCLO4? (Kb ofC2H5NH2 = 5.6 x 10-4)(Hint: You will need to...
- Q Fischer Esterification: Synthesis of Isoamyl Acetate (BananaOil)4)a) What is the role of sulfuric acid in the reaction?b) Why is the mixture extracted with sodium bicarbonate? Youranswer should include a chemical...
- Q The following questions were not following an experiment. Theyare able to be answered without more information.2. In free-raducal halogenation reaction, one can predict therelative amounts of the possible products using...
- Q 2. Industrial humidifiers has two inlet streams – 1. liquidwater and 2. drier air. The entering liquid water stream flows at5.31 mol/min. The component flow rate of air in the...
- Q 1. Wet air containing 60.4 mol% of pure water at 82.5˚C is fedto a dehumidifier at a rate of 185 mol/hr. Outlet of thedehumidifier consists of 2 streams – one...
- Q calculate the Ag+ ion concentration in terms of pAg during thetitration of 50.00 ml of 0.500 M NaCl with 0.1000 M AgNO3 afteraddition of the following volumes if reagent:a) in...
- Q 7. Calculate the pH of the following salt solutionsa) 0.388 M LiC2H3O2b) 0.369 M CH3NH3NO3c) 0.194 M LiClO4
- Q A student forgot to read the label on the jar carefully and putpotassium chloride in a crucible instead of potassium chlorate tobe heated. How would the results turn out?
- Q A 20.00 mL solution of 0.100 M HCOOH (formic) was titrated with0.100 M KOH. The Ka for the weak acid formic is 1.40 x 10-5. a.Determine the pH for the...
- Q Identify the following as Lewis acids or bases. For a polyatomicmolecule, you should be concerned with the central atom, e.g., thenitrogen in NH3b. Co2+d. N(CH3)3e. BBr3f. AlCl3g. K+h. Ca2+i. Hg2...
- Q 1. There are three parts to this question. 2 moles of gaseousPCl5, are heated at 502 K till equilibrium is reached at a totalpressure of 1 atm. (a) Calculate the...
- Q Part B) For 490.0 mL of a buffer solution that is 0.175 M inHC2H3O2 and 0.155 M in NaC2H3O2, calculate the initial pH and thefinal pH after adding 0.020 mol...
- Q Entropy & heat capacity: The definitions for the entropy andheat capacity are pretty similar. So, what is actually thedifference between dS=dq/T and cp = dq/dT? Apply a simple andplausible example...
- Q Assume all of the ionized aspirin remains in the buffer solutionand all of the un-ionized aspirin goes into the ethyl acetate, whatis the molarity of the aspirin in the ethyl...
- Q A beaker with 155 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 Which of the following are characteristics of cholesterol?1) It is a weakly amphipathic, rigid substance.2) It is the precursor for all steroidal hormones.3) It packs neatly with the fatty acid...
- Q A beaker with 105 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 Carbon Minoxide and Chlorine gas react to form phosgene: CO(g) +Cl2(g) <==> COCl2(g) Kp=3.10 at 700 KIf a reaction mixture initially contains 404 torr of CO and257 torr of Cl2,...
- Q A beaker with 140 mL of an acetic acid buffer with a pH of 5.00is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q If the pH of a 1.00-in. rainfall over 1300 miles2 is 3.30, howmany kilograms of sulfuric acid, H2SO4, are present, assuming thatit is the only acid contributing to the pH?...
- Q Lithium trimers are the star-destroying material of sciencefiction. Consider the series of tri-atomic species Li3,Li3+, and Li3-. Foreach species, draw a Lewis dot electron diagram, predict thegeometry, identify the Li-Li...
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!