Chemistry question and answers for September 07, 2023
- Q write 3 paragraph on what you see could be the impacton the planet and society of this new approach to chemistry
- Q How could solubility of an analyte impact its results in HPLC?How would the peak differ, for example? How would a more solublemolecule's peak differ from a less soluble one?Also, what...
- Q For the reaction shown, compute the theoretical yield of product(in grams) for each of the following initial amounts ofreactants.2Al(s)+3Cl2(g)→2AlCl3(s)1) 7.7 g Al, 24.4 g Cl2Express your answer using three significant...
- Q A tank of acetylene gas (C2H2) contains 52.0lb of the gas and isat a pressure of 511.2lb/in.2 .Express the pressure of the gas in atmospheres. 760 mmHg= 14.696lb/in.2.
- Q Calculate the pH at 25°C of a 0.65 M aqueous solution ofphosphoric acid (H3PO4). (Ka1, Ka2, and Ka3 for phosphoric acid are7.5 × 10−3, 6.25 × 10−8, and 4.8 ×...
- Q Phosphine decomposes by the following reaction:COCl2(g) <---> CO(g) +Cl2(g) Kc = 8.3 x 10-4Calculate the concentration of each component when 2.55 g ofphosphine decomposes in a 25.0mL flask.
- Q The decomposition of Ethylene oxide, (CH2)2 O(g), at 652k is a1st- order reaction with R=0.012 min^-1 and an activation energy of218k J/mol (CH2)2 O(g) -----> CH4(g)+ CO (g)Calculate a) the...
- Q A buffer solution is prepared by mixing 20.0 mL 0.45M HAc(acetic acid) with 35.0 mL 0.45M NaAc (sodium acetate)(a) What is the amount of 4.0M HAc which must be added...
- Q Consider a titration involving 40.0 mL of 0.100 M ammonia ,NH3 (in an Erlenmeyer flask)with 0.100 M HCl (in aburette) to answer the next two questions.NH3+ HCl
- Q How are Cu2+ and Bi3+ separated from Pb2+ and How can Bi3+ beseparated from Cu2+?
- Q How many milliliters of 0.640 M HCl are needed to titrate eachof the following solutions to the equivalence point?(a) 30.2 mL of 0.640 M LiOH_________ mL(b) 60.8 mL of 0.768...
- Q Balance each redox reaction occurring in acidic aqueoussolution. Use the half-reaction method. Identify all phases inanswerA) IO3-(aq)+SO2(g)------->I2(s)+SO4^2-aq)Â Â Â Â B) Cr2O7^2- (aq) + Br-(aq)-----------> Cr^3+(aq) + Br(aq)
- Q If 4.90 g of Na2CO3 is dissolved in enoughwater to make 250. mL of solution, what is the molar concentrationof the sodium carbonate?Molar concentration of Na2CO3 =______MWhat are the molar...
- Q If the Ka of a monoprotic weak acid is 6.6×10−6, what is the pHof a 0.29 M solution of this acid?The Ka of a monoprotic weak acid is 0.00604. What...
- Q An aqueous solution containing 5.99 g of lead(II) nitrate isadded to an aqueous solution containing 5.04 g of potassiumchloride. Enter the balanced chemical equation for this reaction.Be sure to include...
- Q A reaction is carried out by combining 65.00 mL of a 0.108 Msample of (NH4)3PO4 and 48.00 mL of a 0.230 M Fe9NO3)2 solution.The net ionic equation is :3Fe^2+(aq) +...
- Q how can i Calculate those ??1)Mass of Cu wire reacted2)Mass of Ag produced3)Mass of AgNO3 reacted4)Moles of Cu reacted5)Moles of AgNO3 reacted6)Moles of Ag produced7)Ratio of moles Ag to moles...
- Q Problem 4.26a Draw all possible structure(s) and give the IUPACsystematic name(s) of an alkane or cycloalkane with the formulaC8H18 that has only primary hydrogen atoms. Select the IUPACsystematic name(s) (all...
- Q Why does LDH exist as a tetramer? What differences exist betweenLDHA and LDHB at the dimer interface? What would happen if LDH weremonomeric?
- Q Explain the advantages and disadvantages of complex coordinationpolymerizations over other addition polymerizations
- Q A) Without doing any calculations (just compare the correctKsp values) complete the following statements:1.calcium sulfide isMORE soluble thanABCD?2.calcium sulfide isLESS soluble thanABCD?A. MgCO3B. CaCO3C. Fe(OH)2D. Pb(OH)2B) For each of the...
- Q Iwhen performing the experiment for magnesium oxide :Why is the empty crucible and cover fired to heat?How critical are the suggested times for heating andcooling?How can you tell when the...
- Q develop a process flow for hydrogenation and friedelcraft reaction
- Q Ka for hypochlorous acid, HClO, is 3.0x10-8.Calculate the pHafter 10.0, 20.0, 30.0, and 40.0 mL of 0.100MNaOH have been addedto 40.0 mL of 0.100 M HClO. I am mostly confused...
- Q Determine the heats of formation or the steric energies of theexo- and endo-anhydride adducts using a molecular mechanicsprogram. What do these energies tell you about the mechanism of thereaction?
- Q Why does the Doppler effect lead to a shift in the atomicemission frequencies of hydrogen atoms in a star but a broadeningof the atomic emission frequencies of hydrogen atoms in...
- Q Thermodynamics of potassium nitrate dissolving in waterexperiment post-lab questions: What does the sign of the delta Gtell you about the dissolution process for this experiment? Is thedissolution process spontaneous at...
- Q Calculate the amount of solution (g or mL) that contains each ofthe following amounts of solute.5.2 g of LiNO3 from a 35 %(m/m) LiNO3 solution.31.6 g of KOH from a...
- Q Problem 8.71Using bond enthalpies (Table 8.4 in the textbook), estimateΔH for each of the following reactions.Part A2CH4(g)+O2(g)→2CH3OH(g)ΔH =-321  kJ  SubmitMy AnswersGiveUpCorrectPart BH2(g)+Br2(g)→2HBr(g)ΔH =-103  kJ  SubmitMy AnswersGiveUpCorrectPart C2H2O2(g)→2H2O(g)+O2(g)ΔH =495  kJ  SubmitMy AnswersGiveUpIncorrect; Try Again
- Q The rate constant for the reaction:2A -> 2B + Cis 0.881M-1*s-1 at 333 degreesCelcius.(a) Starting with a concentration of 0.0955 M, calculate theconcentration of A after 12.5 seconds.(b) Calculate the...
- Q Describe briefly (4-6 sentences) what factors are responsiblefor influencing what face of a π-system in a chiral environment areagent will attack from.
- Q When the following equation is balanced properly under acidicconditions, what are the coefficients of the species shown? 2 Fe +MnO4- 2 Fe2+ + Mn2+ Water appears in the balanced equation...
- Q If the hydrolysis to the diacid is not complete, how could youseparate the desired diacid from the unhydrolyzed anhydride byextraction?You carry out a reaction starting with 200 mg of cyclopentadieneand...
- Q How may grams of solute are needed to prepare the followingsolutions?1.000L of 240.0M NaCl250.0 mL of 0.135 M CuSO4500.0 mL of 0.370 M CH3OHAlso, please tell how you got answers...
- Q : carbonyl(CO) is strong field ligand so [Ni(CO)4] should havesquare planar shape but by the experiment [Ni(CO)4] istetrahedral.Explain this statement.
- Q The Ka of benzoic acid is 6.5 x 10 ^(-5)a) Calculate the pH of a 40.00 mL, 0.1 M benzoic acid buffersolution after the addition of 20.00 mL of a...
- Q Calculate the freezing point of two aqueous solutions, onecontaining 15% magnesium chloride by weight, the other 15% ethylalcohol (CH3CH2OH) by weight. show all calculations
- Q Indicate the concentration of each ion present in the solutionformed by mixingc) 3.60g of KCL in 75.0mL of .250M CaCl2 solution.
- Q Explain how the same protein can migrate differently on SDSpage
- Q Identify the peaks for Raman or Rayleigh on aemission/excitation spectrum for dilute quinine and for dilutesulfuric acid.spectra are not provided
- Q 10)Explain briefly what happens when you eat french fries;describe the step by step process of what happens to the glucoseunits in the starch as they go through the different stages.
- Q A student weighs by difference 0.1956g of sodium oxalate into a100ml Volumetric flask and dilutes to the mark 10mL of HCI and 90mLof distilled water. The student then pipetted a...
- Q If the student uses 5.00 grams of (CH3)3CCO2H, how many grams ofMo(CO)6 will the student need to react completely with the(CH3)3CCO2H.
- Q A conductivity cell when standardized with 0.01 M KCl was foundto have a resistance of 189 Ω. With 0.01 M ammonia solution theresistance was 2460 Ω. Calculate the bas dissociation...
- Q Use the aufbau principle to obtain the ground-state, noble gascore, electron configuration of selenium. Then, select the correctelectron spin states for each orbital in the indicated subshell. Ifan orbital is...
- Q You placed 6.35 g of a mixture containing unknown amounts ofBaO(s) and MgO(s) in a 3.50-L flask containing CO₂(g) at 30.0°C and750. torr. The solid BaO and MgO in the...
- Q Find the pH and equilibrium concentrations of all species of a25 M H2SO3 solution at 25 degree C.
- Q What is the van Deemter equation, and how can it be used toimprove a separation? Support your answer with a sketch of atypical van Deemter plot, making sure to label...
- Q Part AEscherichia coli (E. coli) can under optimalconditions double every 20.0 minutes. How long would it take asingle cell to saturate a 5.0 L culture assuming that optimalgrowth conditions prevaled...
- Q The preparations of two aqueous solutions are described in thetable below. For each solution, write the chemical formulas of themajor species present atequilibrium. You can leave out water itself.Write the...
- Q A chemist studying the reaction C2H4 (g) + I2 (g) ⇌ C2H4I2 (g)places 3.0 mol of C2H4 and 1.0 mol of I2 in a 2.0 L vessel andraises the temperature...
- Q Suppose a 500. mL flash is filled with 1.1 mol of CO, 1.6 mol ofNO and 0.90 mol of CO2. The following reaction becomes possible:NO2(g)+CO(g)=NO(g)+CO2(g).the equilibrium constant K for this...
- Q [NAC (Nanoparticle Assembled Capsule)] The purple dye used todemonstrate encapsulation in this experiment is a mixture. Thecomponents of this colour are Carmoisine (Red) and Indigo Carmine(Blue). The yellow colour Curcumin...
- Q Consider the Daniell cell, for which the overall cell reactionis Zn(s)+Cu2+(aq)⇌Zn2+(aq)+Cu(s) The concentrations of CuSO4 andZnSO4 are 2.20×10−3 m and 1.10×10−3 m ,respectively.A)Calculate E setting the activities of the ionic...
- Q When tert-butanol is placed in the presence of excess equimolaramounts of chloride and bromide ions in aqueous acid experimentaldata indicates 45% tert-butyl chloride and 55% tert-butyl bromideis obtained. On the...
- Q 1. a) Show the balanced half reactions and the total balancedreaction for the following redox reaction in acidic solution.RuO4 + H2SeO3 → Ru3+ + SeO42-b) Comment on whether you expect...
- Q what are the functional groups in organic chemistry?please list the must know ones in a bond-like template.
- Q A 2.46 g sample of a substance suspected of being pure gold iswarmed to 72.7 ∘C and submerged into 15.0 g of water initially at24.7 ∘C. The final temperature of...
- Q Develop a hypothesis to explain why the protein is folded in itsnative state
- Q Experiment - Claisen CondensationReactions:In this experiment, we performed a Claisen condensation reactionof ethyl phenylacetate using potassium tert-butoxide to form ethyl3-oxo-2,4-diphenylbutanoate and ethanol without using a solvent.This allowed us to reduce...
- Q If you began with 5.5 mL of 0.20 M NaHCO3, how manymL of 0.10M HCl would you need to add to get a pH 7 buffer? Giventhat carbonic acid, H2CO3,...
- Q number the forces (1-strongest) in decreaing order of strength.covalent bond, induced dipole, ion-dipole, ionic interaction,dipole-dipole, hudrogen bonds
- Q 1. Name and draw two biocompatible hydrophilic polymers.Briefly describe their applications. Circle the functional groupsthat interact with water. What type(s) of interaction is (are)involved?2. Draw the following tripeptides in their...
- Q A Vi = 10-3 m3 chamber of a gas bottle contains some argon gas(atomic weight = 0.040 kg/mole) at a pressure of 104 Pa and atemperature of 34� C. 1)What...
- Q The heat of combustion of benzoic acid (C6H5COOH) is -3226kJ/mol. When 0.919 g of benzoic acid was burned in a bombcalorimeter, the temperature of the calorimeter (including itscontents) rose from...
- Q Which of the following bases should be used to prepare a bufferwith a pH of 4.5?ammonia, Kb = 1.8 × 10-5hydroxylamine, Kb = 1.1 × 10-8codeine, Kb = 1.6 ×...
- Q Draw sigma only molecular orbital diagram for CH4 assumingsquare planar geometry.
- Q A 1.268 g sample of a metal carbonate, MCO33, was treated 100.00mL of 0.1083 M H22SO44, yielding CO22 gas and an aqueous solutionof the metal sulfate. The solution was boiled...
- Q Use the following data to work through problems 4-6.50.0 mL of each solution was used in each experiment.Each solution had a molarity of 2.00 M.The density of the solutions once...
- Q For the following reaction, 9.88 grams of sulfur are allowed toreact with 21.8 grams of carbon monoxide. sulfur (s) + carbonmonoxide (g) sulfur dioxide (g) + carbon (s)What is the...
- Q Benzene as a saturated liquid at 5,000 mmHg is fed to avaporizer. The product from the vaporizer is a superheat vapor at165°C and 4,550 mmHg.For a flow rate of 2,500...
- Q A 1.000-mL aliquot of a solution containing Cu2 and Ni2 istreated with 25.00 mL of a 0.04503 M EDTA solution. The solution isthen back titrated with 0.02327 M Zn2 solution...
- Q The pH of solution containing 1 mol Cu(OH)2 in 1L water is7.66.Has all the Cu(OH)2 dissolve in water? Ksp=4.8 ×10-20.
- Q 1) The correct arrangement of the following complex ions interms of increasing crystal field splitting energy (D) is:[CrI6]3-Â Â Â Â Â Â Â Â Â Â [CrF4]-Â Â Â Â Â Â Â Â Â Â [Cr(en)3]3+Â Â Â Â Â Â Â Â Â Â [W(en)3]3+a) Smallest [CrI6]3- <[Cr(en)3]3+ <[CrF4]- < [W(en)3]3+Largestb) Smallest [CrI6]3- <[W(en)3]3+ < [CrF4]-<...
- Q When 15.0 mL of a4.89×10-4 M zincnitrate solution is combined with 12.0 mLof a 6.25 ×10-4 M sodiumhydroxide solution does a precipitateform?  (yes or no)For these conditions the Reaction Quotient, Q,...
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