Chemistry question and answers for July 17, 2023
- Q Calculate the standard entropy of vaporization of ammonia at210.0K, given that the molar heat capacities at constant pressureof liquid ammonia and ammonia vapor are 80.8 J.K-1.mol-1 and 35.1J.K-1mol-1, respectively, in...
- Q a. Show with the aid of a form of the Nernst equation that whenusing a pH sensitive glass electrode and reference electrode thatthe measured potential is proportional to pH.b. Sketch...
- Q 8SO2 + 16H2S --> 3S8 +16H2OWhat is the maximum mass of S8 that can be producedby combining 84 g of each reactant?
- Q A dryer is operated with a material containing 10% H2O (by mass)to a final dried material containing 5% H2O (by mass). The freshair is mixed with recycled air and is...
- Q When pure carbon is burnt in air some of it is oxidized to CO2and some to CO. If the molar ratio of N2 to O2 is 7.18 and themolar ratio...
- Q Which one of the following ionic compounds is soluble inwater?NH4C2H3O2AgClBaCO3PbSO4
- Q The number of different bond angles for nonpolarPBr2F3 is?A.5B.2C.3D.4
- Q A) Answer as an isotope1. Write the identity of the missing nucleus for the followingnuclear decay reaction:232 90Th→228 88Ra+?2. Write the identity of the missing nucleus for the followingnuclear decay...
- Q Making mixture solution:Cupric nitrate : wt = 241.60 g/molSMS : wt= 250.278 g/molI want to make the mixture of solution that has cupric nitrateconstant concentration at 10E-5 M, but SMS...
- Q 1.) A diprotic acid has the following pK values: pKa1= 5.50, pKa2 = 9.50a.) At what pH does [H2A] = [HA- ]?b.) At what pH does [HA- ] = [A2-...
- Q please answer the following questions1. Discuss the following properties of water and why they aresignificant: (a) transmission of light; (b) maximum density at 4oC; (c) solvent properties and (d) surface...
- Q Will resulting solution be acidic or basic when combined withpure water?NaClNaOBrC2H5NH3NO3LiHSO3NH4ClO2FeCl3K2CO3PLEASE SHOW ALL WORK
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.210 M HClO(aq) with 0.210 M KOH(aq).(a) before addition of any KOH(b) after addition of...
- Q Organic Chemistry LabWhat is the content of caffeine in tea? Cite your sources.
- Q Assume that you have a solution of 0.1 M glucose 6-phosphate. Tothis solution, you add the enzyme Phosphoglucomutase, whichcatalyzes the following reaction:The ΔG0’ for the reaction is +1.8 kcal mol-1....
- Q The compound known as butylated hydroxytoluene, abbreviated asBHT, contains carbon, hydrogen, and oxygen. A 1.376 g sample of BHTwas combusted in an oxygen rich environment to produce 4.122 g ofCO2(g)...
- Q Post-Ââ€Lab to Accompany the Grignard Synthesis ofTriphenylmethanol You were instructed to add the bromobenzene inincrements during the Grignard preparation to prevent an unwantedside reaction. What would the product of that...
- Q This question is for a laboratory experiment titled\"Determination of the Solubility Product Constant of CalciumHydroxide\" where a saturated solution of Ca(OH)2 in0.02523M NaOH was titrated with HCl.Part 2 Data -...
- Q 1. A portion of NMR spectrum of 4-tert-butylcyclohexanol isshown below, along with a peak list of chemical shifts,multiplicities, and numbers of protons (from integration). Note:the alcohol O-H proton is NOT...
- Q What are the IR and NMR spectral features of isoamylacetate?
- Q Explain how a quadrupole works? (MS)
- Q This question is for a laboratory experiment titled\"Determination of the Solubility Product Constant of CalciumHydroxide\" where a saturated solution of Ca(OH)2 inwater was titrated with HCl.Part 1 Data - Saturated...
- Q The flask is charged with 0.80 g magnesium turnings, THF (45mL), 4-bromo-N,N-dimethylaniline (5.0 g), and asmall crystal of iodine. The mixture is warmed gently to reflux(set the hot plate to...
- Q Exercise 12.98 A gas has a Henry's law constant of 0.136 M/atmPart A How much water would be needed to completely dissolve 1.53 Lof the gas at a pressure of...
- Q The complex ion Cu(NH3)42 is formed in a solution made of 0.0400M Cu(NO3)2 and 0.400 M NH3. What are the concentrations of Cu2 ,NH3, and Cu(NH3)42 at equilibrium? The formation...
- Q Why should sodium bicarbonate solution be added slowly whensynthesizing isoamyl acetate from isoamyl alcohol and glacialacetic acid? Write balanced equations for all reactions that takeplace during the neutralization (experiment involves...
- Q Compound A is a D-aldopentose that can beoxidized to an optically active aldaric acid B. OnKiliani-Fischer chain extension, A is convertedinto C andD; Ccan be oxidized to an optically inactive...
- Q 1. Calculate the pH of a 0.339 M H2S. Calculate the [S2-] in thesolution.2. A titration is performed by adding 0.656 M KOH to 40 mL of0.172 M HNO3:b) Calculate...
- Q Imagine that you are in chemistry lab and need to make 1.00 Lofa solution with a pH of 2.80.You have in front of you100 mL of 7.00×10−2M HCl,100 mL of...
- Q Air is a mixture of gases with the following mass percentagecomposition: 75.52% N2, 23.15% O2, 1.28% Ar, and 0.046% CO2.A. What are the partial pressures of N2, O2, Ar, and...
- Q What are the basic differences between SNAr reaction with SN1and SN2 reactions?
- Q A combustion reaction of a hydrocarbon is defined as thereaction of the compound into carbon dioxide and water.CmHn(g) + (m+(1/4)n)O2(g) ---> mCO2 + (1/2)nH2O(l)1. Demonstrate that this chemical reaction is...
- Q Phosphoric Acid, H3PO4(aq) is a triprotic acid, meaning that onemolecule of the acid has three acidic protons. Estimate the pH andthe concentrations(M) of all species in a 0.300 M phosphoric...
- Q Part A Suppose that a fully charged lead-acid battery contains1.50 L of 5.00 M H2SO4. What will be the concentration of H2SO4 inthe battery after 3.80 A of current is...
- Q 3. Which reactant ineach of the following pairs is a stronger nucleophile? Explain yourreasoning. (3)a. NaOHor H2O​​​b. H2O orCH3COO-  ​​​c. I- orCl-
- Q Find the pH and the volume (mL) of 0.487 M HNO3 needed to reachthe equivalence point in the titration of 2.65 L of 0.0750 Mpyridine (C5H5N)?
- Q A furnace is burning natural gas (90% by mol methane and thebalance ethane) at 20 degrees C and 1 atm with 25% excess air at150 degrees C and 1.1 atm....
- Q Twenty kg of a fuel consisting of 50% methane, 25% ethane and25% propane (by mass) is compressed to 180 atm and 100 degrees C.What is the compressed volume using Kay’s...
- Q Remember the expert uses the numbers in the problemrounded to the correct significant digits. The expert allows plusor minus 3% error in a calculation. So be careful when judging theexpert's...
- Q Consider the reaction: C2H4(g) + H2(g) <-> C2H6(g). Forthis process, deltaH = -137.0 kj/mol and deltaS = -120.6 J/mol*K.Based on these data and assuming deltaH and deltaS are temperatureindependent, answer...
- Q What are the primary sources of error in an experiment where youare calculating the caloric content of food by using a calorimeterthat could explain any differences between you data and...
- Q Calculate the [H3O+] and pH of each polyprotic acidsolution.Dissociation Constants for Acids at 25 ∘CFormulaKa1Ka2Ka3H2CO34.3×10−75.6×10−11H3C6H5O77.4×10−41.7×10−54.0×10−7PART A0.130 M H3C6H5O7 H3O+=PART B0.130 M H3C6H5O7 pH =
- Q How to solve: A solution of K2Cr2O7 is standardized againstFe(NH4)2(SO4)2 6H20. Exactly 0.625g of the iron salt are equivalentto 22.5 mL of the dichromate solution. A sample of unknown iron(II)...
- Q 2 reacts with the halogens (X2) according to the followingreaction:H2(g)+X2(g)?2HX(g)where X2 can be Cl2, Br2, or I2.Reactant/Product?H?f(kJ/mol)?S?f(J/mol?K)H2(g)0130.7Cl2(g)0223.1HCl(g)-92.3186.9Br2(g)30.9245.5HBr(g)-36.3198.7I2(g)62.42260.69HI(g)26.5206.6Assuming deltaGo for the reaction betweenhydrogen and Cl2 is -190.46 kJ calculate Kp for...
- Q A) What is the pH of a solution with a fluoride concentration of0.272 M? The Kb for F- is 1.47 x 10^-11.B) Calculate the pH value of of a 0.015...
- Q A closed system consists of 0.5kg of superheated steam initiallyat 1MPa, 300 0C. The system undergoes a reversibleisothermal process during which the steam condenses to a saturatedliquid whilst exchanging heat...
- Q Describe the bonding between carbons in C2H4 using valence bondtheory. Which of the following is true?There is a pi bond formed by overlapping sp3 hybridizedorbitalsThere is a pi bond formed...
- Q In essence, the__________ side chain is mimicking the__________charge on BPG.
- Q A hydrocarbon A has the molecular formula C8H14. Its NMRspectrum consists of a triplet at 1.2 ppm (relative peak area of2), a triplet at 1.9 ppm (relative peak area of...
- Q C) For each strong base solution, determine [H3O+],[OH−], pH,and pOH.:Express your answer using both three significant figures andthen to three decimal places8.84×10−3 M LiOH1.12×10−2 M Ba(OH)Express your answer using both...
- Q I almost finished my pre-lab... but I am stuck! What are theenergies of (-)-menthone and (+)-isomenthone? How can I find this(how to do it)?Thank you for the help!
- Q Justify the statement, “Tall stacks are no longer considered asan acceptable alternative for controlling emissions from electricpower generating plants.â€
- Q The following buffer was prepared: 50. mL 2.0 M methylamine(CH3NH2) solution and 50. mL of 2.0 M methylamine hydrochloride(CH3NH3Cl) solution. The Kb for methylamine is 4.4 x 10-4What is the...
- Q 1.In your own words, explain the \"surprise\" in Planck's work andthe social significance of the time (1900s).2. Explain how fireworks work.3. Explain the photoelectric effect and the dual nature oflight.4....
- Q Determine the pH of a solution that is 1.65% NaOH by mass.Assume that the solution has density of 1.01 g/mL.
- Q Please explain the reactivity and orientation effects observedin each heterocycle. a. Pyridine is less reactive than benzene inelectrophilic aromatic substitutions and yields 3-substitutedproducts. b. Pyrrole is more reactive than benzene...
- Q A 67 g piece of aluminum at 725K is dropped into a 165 g of H2O(l) at 298K in an insulated container at 1 bar pressure. Calculatethe temperature of the...
- Q A student reacted 100.0 mL of 0.9800 M HCl with 100.0 mL of0.9900 M NH3. The density of                    the reaction mixture was 1.02 g/mL and the heat...
- Q Which alcohol would react the fastest wit Lucas Reagent?:1-pentanol, 2-pentanol, 3-pentanol or 2-methyl-2-butanol
- Q Phenolphhalein indicator is used in this experiment because itchanges color in the pH range of 8.0 to 9.6.Show by calculation that phenolphthalein is an acceptableindicator for the titration of KHP...
- Q Calculate the collision frequency for the N2 –N2 collisions, N2 – O2 collisions andO2 – O2 collisions in air at 298 k and 0.95bar pressure. Assume air is 80 %...
- Q Consider the titration of 25.0 mL of 0.100 M acetic acid (HA)with 0.100 M NaOH.1. Write the balanced chemical equation and equilibrium constantexpression (ECE) for all of the reactions thatoccur...
- Q Why does the negative potential superimposedwith an AC current allow Low mass particles topass through the quadrupole ? Explain in great detail with a figureor two.Please don't copy and paste...
- Q A solution of household bleach contains 5.25% sodiumhypochlorite, NaOCl, by mass. Assuming that the density of bleachis the same as water, calculate the volume of household bleach thatshould be diluted...
- Q Calculate the pH for each of the following cases in thetitration of 35.0 mL of 0.120 M KOH(aq), with 0.120 M HBr(aq).(a) before addition of any HBr(b) after addition of...
- Q What volume of a 15.0% by mass NaOH solution, which has adensity of 1.116 g/mL, should be used to make 5.20 L of an NaOHsolution with a pH of 10.0?Express...
- Q 1. What do you feel is the largest source of experimental errorin your determination of R?2. What would be the effect (increase, decrease, or no change)on the calculated value of...
- Q For CO2+1.Assuming that it has an octahedral geometric configuration,draw an orbital energy diagram and place the valence electrons inthe diagram for its ground state.2. For the same complex, draw an...
- Q Blood is a buffered solution with pH values ranging from7.35-7.45. The important components of blood that contribute to itsbuffering capacity are species derived from carbonic acid andphosphoric acid. This problem...
- Q Hi, i'm working on the lab report for Iodometric determinationof Cu in Brass and i need help with these questions. I greatlyappreciate your help.Info: This experiment has two parts:standardization of...
- Q If Compound A (256 mg) was hydrolyzed using 12.5 mL of 1.0 M KOHand the amount of remaining KOH was back titrated and required 44.9mL of 0.25 M HCL to...
- Q What is the optimal temperature for lactase activity? Explainwhy enzymes are sensitive to temperature change
- Q Consider the nonenzymatic elementary reaction A + B → C. Whenthe concentrations of A and B are each 25.0 mM, the reactionvelocity is measured as 4.11 µM C produced per...
- Q this procedure is a microscale hydration of norbornene.1. What was the stereochemical outcome of the reaction? whatevidence permitted a definitive assignment of stereochemistry?2. Assemble a molecular model of norbornene and...
- Q provide specific information about the ions or compoundsinvolved, their correct names, and demonstrate the correct reasonfor the compound name, molecular formula, or answer. for ioniccompounds identify the charge for the...
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