Chemistry question and answers for July 15, 2023
- Q Select the processes that are expected to be exothermic:a.Li+(g) + F-(g) -->LiF (s)b.Ca2+(g) + 2e- --> Ca(g)c.CaBr2(s) --> Ca (s) +Br2(g)d.S (g) +2e- -->S2-(g)e.Fe (l) --> Fe (s)f.Fe (s) -->...
- Q what benefits or disadvantages come from using Ramanspectroscopy vs gas chromatography for determining the percentalcohol in alcoholic beverages?
- Q Use Tanabe-Sugano diagrams to predict the number oftransitions for the following species:a) Mn(H2O)6 ^2+b) Cu(H2O)6 ^2+c) Fe(CN)6 ^3-
- Q 1. Calculate [OH−] for a solution formed by adding 5.00 mL of0.120 M KOH to 20.0 mL of 7.1×10−2 M Ca(OH)2.2. Calculate pH for a solution formed by adding 5.00...
- Q The common-ion effect and solubility The solubility of aslightly soluble compound can be greatly affected by the additionof a soluble compound with a common ion, that is, with one of...
- Q 1. Interpret the infrared and NMR spectra of benzocaine.2.What is the structure of the precipitate that forms after thesulfuric acid has been added?3. When 10% sodium carbonate solution is added,...
- Q What is the pH of 250.0mL solution that is 0.0955 M HCH3CO2(Ka=1.8x10-5) and 0.125 M NaCH3CO2?a. Now, 20.0 mL of 0.455 M HCl (aq) is added to the originalbuffer.i. Write...
- Q Describe how you could separate and purify compound A from amixture of two neutral compounds (A and B) when A comprises 95% ofthe total and B the other 5% of...
- Q For each of the following oxidation – reduction reactions,identify which element is being oxidized and which is beingreduced? a. Ca (s) + 2H2O (l) ïƒ Ca(OH)2 (s, aq) + H2...
- Q What is the percentage of Fe2O3 in a sample oflimonite ore if the iron from a 0.5000-g sample is reduced andtitrated with 35.15 ml of a potassium dichromate solution of...
- Q 1. In a bomb calorimeter,reactions are carried outa. at 1 atm pressure and25
- Q Ascorbate and copper ions have the following electrochemicalpotentials:Dehydroascorbate+2H++2e−→Ascorbateε∘′=+0.08VCu2++e−→Cu+ε∘′=+0.159V10 mL of a 0.02 M solution of ascorbate in a buffered solutionat pH7 at 25∘C is mixed with 10 mL of 0.02...
- Q Assuming standard conditions, answer the followingquestions.(If hydrogen is one of the reagents, assume acidic solution.)a) Is Fe2+(aq) capable of oxidizing Crmetal?b) Is H2(g) capable of reducingNi2+(aq)?c) Is Cr3+(aq) capable of...
- Q How are lithium ion batteries different from regularbatteries?How does this allow for a rechargeable battery?
- Q Question 31) What is the H+ concentration for an aqueous solution with pOH= 4.09 at 25 ∘C? Express your answer to two significant figures andinclude the appropriate units.2)Arrange the following...
- Q When pure carbon is burnt in air some of it is oxidized to C02and some to CO. If the molar ratio of N2 to 02 is 7.18 and themolar ratio...
- Q What is the concentration of EACH solution in thesereactions...Table 1:Concentrations Used of H2O2 and KITrialH2O2KI15 mL of 3% H2O210 mL of 0.60M KI25 mL of 3% H2O210 mL of 0.30M...
- Q Calculate the final concentration of each of the followingdiluted solutions.0.50 L of a 4.0 M HNO3 solution is added to water so that thefinal volume is 8.0 L .Water is...
- Q a) A student A weighed .50 Ca(OH)2 for his saturated solutionand student B weighed 0.23 g, Both students dissolved it in 60 mlof water and both had solid left in...
- Q Calculate the pH at 25°C of a 0.94 M solution oflidocaine HCL (C14H21NONH2Cl). Note that lidocaine is a weak basewith a PKB of 7.94. Round answer to 1 decimal place.
- Q At a given temperature, 1.43 atm of H2 and 3.15 atm of I2 aremixed and allowed to come to equilibrium. The equilibrium pressureof HI is found to be 1.844 atm....
- Q Would using a spectroscopic method to determine equilibriumconstant of a solution work if there was no isosbestic point in theabsorption spectra?Why or why not?
- Q What is the Q (IP) when 284 mL of 0.053 M solution of Na2CO3(aq)are mixed with 243 mL of 0.072 M solution of BaCl2(aq). The solidproduct is BaCO3
- Q Part AAt a pH of 7.40, what is the ratio of the molar concentrationsof HPO42− to H2PO4−? Express your answer using two significantfigures.Part BAt a pH of 7.40, what is...
- Q What is the pH of a 0.56 M solution of methylammonium chloride,CH3NH3Cl? What is the concentration of methylamine in the solution?Kb (methylamine) = 4.4×10-4 pH = ___________ [MeNH2] =________M
- Q Van der Waals GasesUnder what conditions of volume does a van der Waals gas behavelike an ideal gas? Use the van der Waals equation of state tojustify your answer.
- Q A reduction reaction can be carried on many organic compounds.It is the reverse of an oxidation reaction. Which of the followingstatements is true? A reduction reaction can be carried on...
- Q 23. In the following reaction, how many grams of sodium sulfateare needed to react with 3.08 moles of strontium nitrate? (Hint:stoichiometry mol Na2SO4: mol Sr(NO3)2 = 1 mol: 1 mol)...
- Q 451.4 g of lead reacts with excess oxygen forming 377.0 g oflead(II) oxide. Calculate the percent yield of the reaction.
- Q many variables must be held constant during this kineticsexperiment but maintaining a constant temperature is mostimportant. Why?
- Q A 0.582 gram sample of a metal, M, reacts completely withsulfuric acid according to:M(s)+H2SO4(aq)--->MSO4(aq)+H2(g).Avolume of 269 mL of hydrogen is collected over water; the waterlevel in the collecting vessel is...
- Q chlorine gas can be prepared in the lab by the reaction ofhydrochloric acid with manganese oxide. you add 42.5g of MnO2 to asolution containing 48.9g of HCL.A-what is the theoretical...
- Q 1. The lines observed in H-lamp are parts of Balmer Series. Allthese lines are due to a transition from various higher n value toa common n. What is this common...
- Q A cylinder with a piston contains 0.300 mol of oxygen at2.50×105 Pa and 360 K . The oxygen may be treated as an ideal gas.The gas first expands isobarically to...
- Q Describe how H-1 NMR spectroscopy can be used to differentiatecis- from trans-4-tert-butylcyclohexanol.
- Q The specific heat capacity of an unknown metal was determinedfollowing Part A of the Experimental Procedure in this experiment.The following table is for Trial 1.Mass of unknown metal (g) 15.45Temperature...
- Q 1) Calculate pH of saturated solution of silver nitrite (AgNO2)in water if its solubilityproduct is Ksp= 6.1*10^-4 and the pKa of nitrous acid is3.4.2) Dibasic calcium phosphate (CaHPO4) has limited...
- Q Propose a structure for an aromatic hydrocarbon, C9H12, that canform only one C9H11Br product on substitution of a hydrogen on thearomatic ring with bromine.
- Q What would the potential of a standard hydrogen (S.H.E.)electrode be if it was under the following conditions?[H+]=0.59MÂ Â PH2 =3.0 atm T=298 K
- Q For each of the following reactions, calculate the grams ofindicated product when 15.4 g of the first reactant and 10.5 g ofthe second reactant is used: Part A 4Li(s)+O2(g)→2Li2O(s) (Li2O)Part...
- Q Find the pH during the titration of 20.00 mL of 0.2350M butanoic acid,CH3CH2CH2COOH(Ka = 1.54 ✕ 10-5), with 0.2350M NaOH solution after the following additions oftitrant.(a)    0 mL(b)    10.00 mL(c)    15.00 mL(d)    19.00 mL(e)    19.95...
- Q 1.250 g of H2C2O4 are dissolved into 100.0 ml of water which isthen titrated with 28.56 ml of NaOH solution. What is the molarityof the NaOH solution? H2C2O4 + NaOH...
- Q Pre-Lab Exercise: 1. What is a primary standard substance? Givean example. 2. What is meant by the term, equivalence point, duringan acid-base titration? 3. What is an indicator? What role...
- Q Hydrogen reacts with oxygen to form water. If 16 g of hydrogenis mixed with 16 g of oxygen, how much water can form?
- Q For each of the following:• Assign Oxidation States (Numbers) to each atom in reactantsand products• Identify the species being reduced and the species beingoxidized• Balance each redox reaction using the...
- 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 cylinder with a movable piston contains 2.00 g of helium, He,at room temperature. More helium was added to the cylinder and thevolume was adjusted so that the gas pressure...
- Q At a pH of 4, the Cu-neocuproine complex formed in theliquid-liquid extraction experiment has a partition coefficient ofabout 6.3 when equilibrated between the acid aqueous solution andchloroform. Calculate the concentration...
- Q What is the pH of a soft drink in which the major buffer componentsare 8.50 g of NaH2PO4 and 9.23 g of Na2HPO4 per 355 mLs ofsolution?
- Q A 25.0 mL sample of 0.100 M acetic acid is titrated with a 0.125M NaOH solution. Calculate the pH of the mixture after 10, 20, and30 ml of NaOH have...
- Q 1. Why do you need to use KHP to standardize a solution ofNaOH?2. Why isn’t it necessary to know the exact amount of wateradded to the sample?3. Compare the titration...
- Q Which of the following pairs has the stronger acid listedfirst?Question 9 options:a)H2AsO3,H2AsO4b)H2S, HClc)HI, HBrd)H2SO3,H2SO4e)HClO,HClO3Â Â Â Â Â Â
- Q Determine the isoelectric pH for threonine, aspartic acid,arginine, and the tripeptide his-ile-lys. You will probably have towrite out the equations in order to do this correctly.
- Q a volume of 25 ml of .1 m c6h5co2h (aq) is titrated with .1 Mnaoh (aq) what is the ph after the addition of 12.5 ml of naoh (kaof benzoic...
- Q the Al(H2O)63+ ion is formedwhen an Al3+ ion acting as a Lewis acid picks up sixpairs of electrons from neighboring water molecules acting as Lewisbases to give an acid-base complex,...
- Q Given the following list, how many of the compounds are solublein water?sodium nitrateammonium permanganatelithium carbonateiron (II) acetatecopper (I) chloridechromium (III) phosphatealuminum hydroxidesilver (I) sulfatelead (II) iodidetitanium (IV) sulfidemercury (II) bromidepotassium...
- Q -Give the reaction of the dissolution of NH4Cl in water (Uselowest possible coefficients. Include states of matter under thegiven conditions in your answer)-When 6.53 grams of NH4Cl is dissolved, how...
- Q Your acid has a pka of 7.54 and a concentration of 0.084M.You are given 38.6mL of this acid,what is the pH of this initial solution? Calculate the pH of the...
- Q A. One beaker contains 10.0 mL ofacetic acid/sodium acetate buffer at maximum buffer capacity (equalconcentrations of acetic acid and sodium acetate), and anothercontains 10.0 mL of pure water. Calculate the...
- Q A. Look up and report Kf for copper(II), iron(II),and iron(III) with EDTA. Cite your reference(s). (0.2) (I DID THISALREADY)B. What happens to your titration and results if any of thosemetals...
- Q 1.567 g of an unknown Mohr’s salt was dissolved in 80 mL of thesulfuric acid / phosphoric acid mixture solution. This ironsolution was then titrated with a potassium permanganate solution(0.02M),...
- Q Cobaloxime Synthesis Questions1. Given this compound:chloro(pyridine)bis(dimethylglyoximato)cobalt(III)a) Does this complex contain any chelating ligands? If so, whichones and what is their denticity?b) Which ligands are monodentate?c) Which ligands are neutral?d) Which...
- Q When you think of a career in chemistry, you may visualize anolder man with grey hair mixing chemicals in a laboratory with alot of explosions. However, in today’s society there...
- Q I wanna learn drawing orbital in computerHow to draw 3d orbital in a computer？which program should I use?Does any teaching video？
- Q Calssification and Identification of Aldehydes andKetones1.Give a valid structure of a compound that contains thefollowing functional groups:a. an aldehydeb. an aromatic aldehydec.a ketoned.a methyl ketone2. Why can you not distinguish...
- Q Explain how symmetry arguments are used to construct molecularorbitals.
- Q A solution contains 10.75g of an unknown compound dissolved in50.0 mL of water. (Assume a density of 1.00 g/mL for water.) Thefreezing point of the solution is -3.38 C. The...
- Q Consider these reactions where M represents a generic metal:2M(s) + 6HCl(aq) ---->2MCl3(aq) + 3H2(g) Delta H1 =-569kjHCl(g) ----> HCl(aq)Â Â DeltaH2 = -74.8H2(g) + Cl2(g) ----> 2HCl(g) Delta H3 = -1845kjMCl3(s)...
- Q At 1 atm, how much energy is required to heat 87.0 g of H2O(s)at –16.0 °C to H2O(g) at 169.0 °C?
- Q An unknown compound contains only C, H, and O. Combustion of4.90 g of this compound produced 11.5 g of CO2 and 3.15 g of H2O.what is the empirical formula?
- Q Could plastics be used for the exterior of spacecraft? What arepolymer molecules like and what type of intermolecular force(s)hold them in the solid state? When high energy U.V. photons hitpolymer...
- Q Write out the characters of the following direct products in D4hsymmetry and determine the irreducible representations whichcomprise them. Show your work in detail. The D4h table can be foundonline. a....
- Q An aqueous ethylene glycol (HOCH2CH2OH, FW = 62.07 g/mol)solution with a mass of 296.7 mg is titrated with 65.9 mL of 0.0705M Ce4 in 4 M HClO4. The solution is...
- Q For each of the following solutions, calculate the initial pHand the final pH after adding 0.005 mol of NaOH290.0 mL of a buffersolution that is 0.315 molL−1 in C2H5NH2 and...
- Q Chapter 3, problem 21. An electrochemical battery is used toprovide 1 milliwatt (mW) of power for a (small) light.The chemical reaction in the battery is: 1/2 N2 (g) + 3/2...
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