Chemistry question and answers for August 06, 2023
- Q Consider the chemical reaction: C(s)+H2O(g)→CO(g)+H2(g)How many liters of hydrogen gas are formed from the completereaction of 1.16 mol of C? Assume that the hydrogen gas iscollected at a pressure of...
- Q Assume you dissolve 0.235 g of the weak acid benzoic acid,C6H5CO2H, in enough water to make 3.00 ✕ 102 mL of solution andthen titrate the solution with 0.138 M NaOH.C6H5CO2H(aq)...
- Q 81) You are a engineer in a shipping company and youhave identified some corrosion on one of your ocean freighters thatis occurring below the water line, around rivets that have...
- Q Which equation can be used to find the pH of a buffer. Thencalculate the pH of a buffer containing 0.20 M CH3COOH and 0.20 MCH3COONa. What is the pH after...
- Q Candy chemist was asked to determine the concentration (m/m) ofnew alcoholic beverage from the molarity, which was determined tobe 3.205 M and the density, which was found to be .984...
- Q how could proton nmr be used to quickly differentiate between amono versus a di-nitration product
- Q Gaseous indium dihydride is formed from the elements at elevatedtemperature: In(g)+H2(g)⇌InH2(g),Kp=1.48 at 973 K The partialpressures measured in a reaction vessel arePInPH2PInH2===0.0550atm0.0290atm0.0780atm Determine the equilibriumpartial pressure of In. Determine the...
- Q Can an impure sample of oleic acid be purified byrecrystallization? Justify your answer for full credit.
- Q Ways and sugesstions to improve Aldol Reaction:Dibenzalacetone lab/ experiment?
- Q If He(g) has an average kinetic energy of 4890 J/mol undercertain conditions, what is the root mean square speed of F2(g)molecules under the same conditions?
- Q 1. For an electron, the number of values the spin quantum numberMs can take on is; Three, four, one, two?2. what is the threshold energy for the production of anproton-antiproton...
- Q In a titration of 44.86 mL of 0.3356 M ammonia with 0.3356 Maqueous nitric acid, what is the pH of the solution when 44.86 mLof the acid have been added?
- Q Consider the following reaction: 2H2S(g)+SO2(g)⇌3S(s)+2H2O(g) Areaction mixture initially containing 0.500 M H2S and 0.500 M SO2was found to contain 1.3×10−3 M H2O at a certain temperature. Asecond reaction mixture at...
- Q I'm being asked to compute the literature \"true\" value of theheat of solution of KCll at infinite solution. What do I need/howdo I do this?
- Q 1)Hypochlorous acid (HOCl), a weak acid (pKa = 7.6) can be usedfor disinfecting water. If 1 mg of HOCl is added to pure water tomake up 1 L of liquid...
- Q List the following aqueous solutions in order of decreasingfreezing point: 0.040 m glycerin (C3H8O3), 0.020 m KBr, 0.030 mphenol (C6H5OH
- Q A standard iodate solution is prepared at 22.0 °C by dissolving0.9123 g (uncorrected mass) of KIO3 with deionized water in a499.92 mL volumetric flask. To standardize the Na2S2O3 solution, a10.005...
- Q Questions are as shown. NO additional information wasgiven.1. Calculate the f.e.m. for the following reaction at25oC Li+(aq) (1.8e-4M) +  2Cl-(aq) (6.9e-2M)    →   Li(s) ( - M)+   Cl2(g) ( - M)Ecell = ?...
- Q Solid carbon can react with gaseous water to form carbonmonoxide gas and hydrogen gas. The equilibrium constant for thereaction at 700.0 K is Kp=1.60×10−3. If a 1.55-L reaction vesselinitially contains...
- Q A protease is an enzyme that catalyzes the hydrolysis of thepeptide bonds of target proteins. How might a protease bind atarget protein so that its main chain becomes fully extended...
- Q When a saturated paraffin such as polymethylene is chlorinated,chlorine replaces hydrogen at random. Invariably, small amounts ofchlorine (10–50 wt% Cl) cause a lowering of softening point. Largeamounts (about 70%) raise...
- Q Show the calculation of the oxidation number (charge) of ONLYthe atoms which are changing in the following redox equations andthen show how they are used to balance the following redoxequation....
- Q 1. When heated, calcium carbonate gives off CO2 according to thefollowing reaction: CaCO3(s) → CO2(g) + CaO(s) You perform thisreaction in lab by heating a test tube containing CaCO3 and...
- Q What is the mass of the precipitate formed when 207.86 mL of 0.250M barium chloride is added to 150.00 mL of a 1.750 M sulfuric acidsolution?
- Q 1) Use the Henderson-Hasselbalch equation to calculate the pH ofa buffer solution prepared by mixing equal volumes of 0.230 MNaHCO3 and 9.00×10−2 M Na2CO3. (use Ka values given onWiki)2) A...
- Q A process stream flowing at 35 kmol/h contains 15 mole% H2 andthe remainder 1-butene. The stream pressure is 10.0 atm absolute,the temperature is 50 oC and the velocity is 150...
- Q Given the following organic equation and data, calculate theexperimental percent yield of benzoic acid in grams:11.29 mL of ethyl benzoate was reacted with 6.3 grams of sodiumhydroxide under reflux conditions...
- Q Rank the following elements by electron affinity, from mostpositive to most negative EA value.cesium, argon, iodine, selenium, arsenic
- Q A metal, M, forms a nitride compound with the formula M3N2. Thiscompound is 84.78 % M by mass and 15.22 % N by mass. Calculate themolar mass of the metal,...
- Q Elements Beryllium,Magnesium,Calcium, and Strontium are elementsin group 2. These elements are relatively reactive-they will reactwith oxygen,acid and bases. Consequently they are found as mineralsand are combined with other elements. What...
- Q We’re going to titrate formicacid with the strong base, NaOH. There is initially 100. mL of 0.50M formic acid and the concentration of NaOH is 1.0 M. Allwork MUST beshown...
- Q A biochemist has 100 mL of a buffered solution at pH 7.3. Theconcentration of the buffer is 0.1 M, and the pKa of thebuffer is 7.8. If the biochemist adds...
- Q Please explain each of the questions, thanks.1. Describle the correlation between bond energy and bond lengthfor a series of single bonds.2. Describle, with appropriate explanantions, the key factorswhich affect the...
- Q Part A:How many coulombs are required to plate a layer of chromiummetal 0.24 mm thick on an auto bumper with a total area of 0.29 m2from a solution containing CrO2−4?...
- Q Derive a general expression for the spacing between adjacentenergy levels in the 2D Rigid Rotor.
- Q 1)Consider the titration of 50.0 mL of 0.20MÂ Â NH3 (Kb=1.8
- Q A 250mL buffer solution is 0.250M in acetic acid and 0.250M insodium acetate.A) What is the pH after the addition of 0.005 mol of HCl?B) What is the pH after...
- Q A 2.2222 gram sample containing soda ash is dissolved in a 100mL volumetric flask. A 24.98 mL aliquot is analyzed and required45.67 mL of 0.1234 M HCl, before it was...
- Q Write a balanced equation from each line notation:a) Ag(s)|Ag¹á©(aq)||Cr³á©(aq)|Cr(s)b)Pb(s)|Pb²(aq)||MnOâ‚‚(aq)|Mn²á©(aq)|Pts)
- Q Solubility  of  Gases8. What  is  the  saturation  concentration  of DO  at  10°C  in  mg/L?
- Q A mixture of water and graphite is heated to 600 K . When thesystem comes to equilibrium it contains 0.11 mol of H 2 , 0.11 molof CO , 0.31...
- Q Why do line spectra forsubstances differ? Could line spectra be used to fingerprintemissions?
- Q An electric stove burner on its highest setting exhibits anorange glow.A) When the burner setting is changed to low, the burnercontinues to produce heat but the orange glow disappears. How...
- Q of the metal ions tested, sodium produces thebrightest and most persistent color in the flame. do you thinkpotassium could be detected visually in the presence of sodium byburning this mixture...
- Q . . Ammonium carbamate (molar mass = 78.08 g/mol) decomposesaccording to the reaction shown below, producing ammonia and carbondioxide. (NH4)(NH2CO2)(s) ⇌ 2NH3(g) + CO2(g) Kp = 0.400 at 298 K10.2...
- Q Background: A 102.4 mL sample of 0.110 M methylamine (CH3NH2,Kb=3.7×10−4) is titrated with 0.230 M HNO3. Calculate the pH afterthe addition of each of the following volumes of acid.A.) 0.0...
- Q A chemist titrates 80.0mL of a 0.6050M trimethylamine CH33Nsolution with 0.2965M HNO3 solution at 25°C . Calculate the pH atequivalence. The pKb of trimethylamine is 4.19 . Round your answerto...
- Q If 25.15mL of 0.500M NaOH was required to neautralize 50.00mLof an H3PO4 solution, what is the molarity of the acidsolution?Calculate the % of H3PO4 (w/w) of the phosphorus acid solutionfrom...
- Q what is the concentration of Cd2+ in a 0.010 M Cd(NO3)2 solutionthat is also 1.0 M NH3? For Cd(NH3)4^2+, Kf=1.0x10^7
- Q Consider the formation of solid Ba(IO 3 ) 2 from the mixing of7.5mg of barium chloride being dissolved in 500ml of 0.023M sodiumiodate.a) How much solid barium iodate formb) What...
- Q 1. If we use symbol Usys to represent theenergy (also referred as internal energy) contained in the system,what is a reasonable symbol to represent the energy of thesurroundings? Provide an...
- Q How do you would prepare a 2.00 M solution of sodiumchloride?
- Q Whyis it useful to carry out steam distillation rather than simpledistillation or fractional distillation to isolate essential oilsfrom spices? Why not just use direct extraction of the spices withdichloromethane or...
- Q The weakest attractive force among these is:Question 20 options:A)dipole-dipole forceB)hydrogen bondingC)ion-dipole forceD)London forcePrevious PageNext PagePage 20 of 42
- Q What is the net charge of thedipeptide Glu-Ala at pH=4.1, given the following data for theindividual amino acids:Glu: pKa1= 2.1; pKa2= 9.5; pKaR= 4.1Ala: pKa1 = 2.3; pKa2 = 9.9
- Q Can you please write a written detailed procedure (likeparagraph not a chart please) for the two experiments:1- qualitative analysis of cation group 12- qualitative analysis of cation group 2
- Q #1. Show workConsider a new alloy that is made by mixing the following threemetals in the given proportions, bymass: 55.75% aluminum; 33.50% lead; 10.75% magnesiumThe new alloy is sold as...
- Q A student started a synthesis of alum with 3.4x10^-2 molealuminum:2Al (s) + 6h2O (I) + 2KOH (aq)------> 2K[Al(OH)4] (aq) + 3H2(g) (1)2K[Al(OH)4] (aq) + H2SO4 (aq) ------> 2Al(OH)3 (s) +2...
- Q What is the approximate pH at the equivalence point of a weakacid-strong base titration if 25 mL 21) of aqueous formic acidrequires 29.80 mL of 0.0567 M NaOH? Ka =1.8...
- Q A 0.400 M solution of weak base has a pH of 9.85. What is thebase hydrolysis constant, Kb for the weak base?
- Q 125.0-mL aliquot of 0.124 M diprotic acid H2A (pK1 = 4.03, pK2 =8.06) was titrated with 1.24 M NaOH. Find the pH at the followingvolumes of base added: Vb =...
- Q Description: In week 1 we discussed which aminoacids were termed “essential†but we lacked the knowledge to reallyunderstand why these would be difficult to make. Now that we haveexamined the...
- Q A 23.7 mL sample of 0.355 M ammonia, NH3, is titrated with 0.329M hydrochloric acid. At the equivalence point, the pH is .
- Q Consider N2O4 (g) ---> 2 NO2(g) . 3.00 X 10-2 mol of N2O4 areplaced in a 1.0 L flask. AT equilibrium, 2.36 X 10-2 molof N2O4 remain. What is the...
- Q The dibasic compound B (pKb1 = 4.03,pKb2 = 8.06) was titrated with 1.12 MHCl. The initial solution of B was 0.112 M and had avolume of 100.0 mL. Find the...
- Q A 110.0-mL aliquot of 0.120 M weak base B (pKb = 4.55)was titrated with 1.20 M HClO4. Find the pH at the followingvolumes of acid added: Va = 0.00, 1.30,...
- Q Why does the Zaitsev product always form in an E1 reactionregardless of the bulkiness of the base?
- Q A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and25.0 g of NaC2H3O2 in 775 mL of solution (the final volume). (a)What is the pH of the solution?...
- Q KBr crystallizes in a NaCl (B1) structure with a latticeconstant of a=0.65966nm.Determine the bulk density of KBr and the distance between a K ionand a touching Brion in the structure....
- Q how does the rotameter (flow meter) measure volumetric flow rateof air in the system?explain using a digram and 2-3 sentencediscussion of the forces acting on the rotameter ball.
- Q what is the chemical equation for the formation of eugenol fromDCM and anyhydrous sodium sulfate?
- Q Classify the following ionic compounds according to theSigma-Aldrich solubility scale based on their molar solubility(S).Answer choices are: Very Soluble, Freely Soluble, Soluble,Sparingly Soluble, Slightly Soluble, Very Slightly Soluble, andPractically Insoluble.a)...
- Q What are the forms / pools of K in the soil? Which two poolsconstitute the available K to the plant in a growing season?Discuss briefly the relationship between these two...
- Q A titration is performed by adding .435M KOH to 80ml of .205MHC3H5O2.A) Calculate the pH before the addition of any KOH?B) Calculate the pH after the addition of 7.54ml of...
- Q Two isomeric compounds, A and B, are known to each have amonosubstituted benzene ring (C6H5). Both have the formulaC6H5C3H5O2 and both are insoluble in water. However, when they aretreated with...
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