Chemistry question and answers for September 29, 2023
- Q technique summary for distillation lab
- Q #18.37 Balance each of the following redox reactions occurringin acidic aqueous solution.A) Cd(s)+Cu+(aq)→Cd2+(aq)+Cu(s)B) I−(aq)+SO42−(aq)→H2SO3(aq)+I2(s)
- Q Select all of the correct statements aboutequilibrium from the choices below.At equilibrium the rates of forward and reverse reactions areequal.As a reaction proceeds forward toward equilibrium the productconcentrations rise.At equilibrium...
- Q One of the assumptions of the kinetic molecular theory is thatthere are no intermolecular forces (attractive or repulsive)between gas particles (atoms or molecules). How would the presenceof intermolecular forces affect...
- Q In a Mohr titration of chloride with silver nitrate, an error ismade while preparing the indicator. Instead of 0.011 M chromateindicator in the titration flask at the endpoint, there is...
- Q Predict the number of d-electrons AND number of unpairedelectrons on the metal in each of the following complexes(explanations helpful!):1. [Cr(H2O)4F2]2. [Rh(en)3]3+3. [Pt(CN)4]2-4. [TiCL4]3-
- Q 1)Consider the formation of hydrogenfluoride:H2(g) + F2(g) ? 2HF(g)If a 2.8 L nickel reaction container (glass cannot be used becauseit reacts with HF) filled with 0.0085 M H2 is connectedto...
- Q When you mutate a Gly residue that immediately follows analpha-helix to an Ala residue, the protein becomes less stable of2.0 kcal/mol. Explain the molecular basis of this result.
- Q For the following chemical equation:CaCO3(s) + 2HCl(aq).......>H2)(l) +CO2 (g) +CaCl2 (aq)A). How many liters of CO2 can form at STP when 18.5 mL of a3.51 M HCl solution reacts with...
- Q how many grams of Al can be produced in anelectrolytic cell containing a solution of aluminum chloride if acurrent of 10.0 A is applied for 5 hours?
- Q A sample of a peptide of unknown sequence was treated withtrypsin; another sample of the same peptide was treated withchymotrypsin.The sequences (N-terminal to C-terminal) of the smaller peptidesproduced by trypsin...
- Q The reversible chemical reactionA+B⇌C+Dhas the following equilibrium constant:Kc=[C][D][A][B]=5.9Initially, only A and B are present, each at 2.00 M.What is the final concentration of A once equilibrium isreached?Part BWhat is the...
- Q Suppose you have a solution containing CuBr42- and CuSO4 at roomtemperature. You want to isolate a solution of only CuSO4. You havethe following AgNO3 (s), a pot of boiling water,...
- Q During reflux, you oxidized ethanol to acetic acid, usingpostassium dichromate.A) How many grams of ethanol can be oxidized by 100.00mL of a0.750M K2Cr2O7 solution?B) In a similar reaction, a chemist...
- Q 33)(a) A piston at 5.9 atm contains a gas that occupies a volume of3.5 L. What pressure would have to be placed on the piston to forcethe volume to adjust...
- Q Explain the process that occur in a coagulation bath, use PAN asan example.
- Q a. 0.130 g of HCl is in 35.0 mL of water. This is mixed with50.0 mL of 0.185 M Sr(OH)2. What is the pH of theresulting solution?b. Calculate the pH...
- Q Answer the following multiple choice questionsbelow:1a. Increasing the flow rate of the mobile phasewould:A.increase longitudinal diffusion.B.affect nothing.C.increase broadening due to multiple paths.D.increase broadening due to mass transfer.1b. Reverse phase HPLC...
- Q 8. What kinds of functional groups or coatings are available inSPE cartridges and how does one elute the sample through thecartridges?
- Q Calculate the pH of a 0.0290 M aqueous solution of the weak basetriethylamine ((C2H5)3N, Kb = 5.20×10-4). pH = ?
- Q Given the reactivity difference for the 4- positionversus the 1-position, do you think that the chlorine atomstabilizes, destabilizes or has no effect on an adjacent radical?Is it the Resonance or...
- Q 4. A solution of benzene and toluene at 25C and 760mmHg has atotal vapor pressure (Ptotal) of 71.08 torr (mmHg). Ifthe partial pressures of benzene (Pbenzene) and toluene(Ptoulene) are 60.86...
- Q A chemist isolated 0.7886 g of isoamyl acetate from areaction of 0.8235 g of isoamyl alcohol and 1.5 mL of aceticacid.What is the percent yield for the reaction above?
- Q 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6H2O(g)A scientist adds 7.00 atm of NH3(g) and 8.00 atm ofO2(g) to a 5.0 L container at 473 K. What will...
- Q Question 3: Draw the titration curve (pH versus mL of NaOHadded) that would be obtained from the titration of 30 mL of a 0.10M solution of an unknown triprotic acid,...
- Q The heating value of combustible fuels is evaluated based on thequantities known as the higher heating value (HHV) and the lowerheating value (LHV). The HHV has a higher absolute value...
- Q 12.0 L container of sulfur dioxide has a pressure of 285 Torr T-110oC. What mass of SO2 is present?
- Q Calculate the expected pH when 0.5 mL of 0.1 M HCL is added to30.0 mL pure water. Do the same calculation when the same amount ofHCl is added to 30.0...
- Q Even though sucrose is considered a non-reducing sugar, it may haveacted as a reducing sugar with certain reagents. Suggest a reasonfor this observation.
- Q Because of the toxicity of mercury compounds, mercury(I)chloride is used in antibacterial salves. The mercury(I) ion (Hg22+ ) consists of two bound Hg+ ions.a. What is the chemical formula of...
- Q Which of the following compounds would produce a negative testfor chromicacidand a positive test for 2,4-dinitrophenylhydrazine,be soluble in sulfuric acidand be insoluble in sodium bicarbonate:methyl m-nitrobenzoate, 2-pentanone, or 1-octanol? 

- Q Propose a method to test the antioxidant activity (DPPHScavenging method) of organic compounds. Write a detailed reportabout the protocol. Write the purpose, materials, calculations,methods, etc.
- Q Draw (1S,3S)-3-methylcyclopentanol and explain yourreasoning.
- Q Acetic acid has a normal boiling point of 118 ∘C and a ΔHvap of23.4 kJ/mol.What is the vapor pressure (in mmHg) of acetic acid at40 ∘C?
- Q how do you find bond angle measurement with a line bondstructures
- Q One mole of an ideal gas at 1.00 atm and 298K withCp,m=3.5R is put through thefollowing cycle: a) (reversible) constant volume heating totwice its initialtemperature; b) reversible, adiabatic expansion back...
- Q A chemistry graduate student is given 100.mL of a 1.50Mdiethylamine C2H52NH solution. Diethylamine is a weak base with=Kb×1.310−3. What mass of C2H52NH2Cl should the student dissolve inthe C2H52NH solution to...
- Q A. Which of the following can behave as Bronsted-Lowry bases inaqueous solution?NO3-H3PO4NH4+HClONone of the AboveB. Which of the following can behave as Bronsted-Lowry bases inaqueous solution?NH4+NH3Ca(OH)2Br-None of the AboveC. Which...
- Q Osmium (76Os) has seven naturally occurring isotopes, six ofwhich are stable. Osmium 193 is a beta-emitter. A sample of 193Oswith mass of 58.36 μg emits 13.52×108 βparticles in a time...
- Q Find the pH of each of the following solutions of mixtures ofacids.a) 0.120 MM in HBrHBr and 0.135 MM in HCHO2HCHO2Express your answer to three decimal places.b) 0.155 MM in...
- Q Determine the pH?1)Â Â 0.18M KCHO22)Â Â 0.15M CH3NH3I3)Â Â 0.19M KIthanks
- Q 1. What normally happens when iodine is added tostarch?2.Tube 2 contained starch at the beginning of theexperiment. How do you explain the reaction with iodine at the endof the experiment?3....
- Q Rather than titrating the active ingredient in an antaciddirectly with a standard solution of a strong acid in our buret, inthis experiement we first dissolve the antacid tablet in a...
- Q Organic Structures Shapes and IsomerismHands-On Labs, Inc.Version 42-0183-00-02Lab Report AssistantThis document is not meant to be a substitute for a formallaboratory report. The Lab Report Assistant is simply a summary...
- Q A fictional company has been producing propene oxide, C3H6O,from propene, C3H6, with a 96.0%yield. The process requires the useof a compound called m-chloroperoxybenzoic acid, C7H5O3Cl,which can be abbreviated as mCPBA....
- Q #1. Which following statement statements is WRONG forBenzocaine?A. It is an aromatic carboxylic ester.B. Benzocaine is acidic in nature.C. It is basic in nature.D. Benzocaine is used to reduce the...
- Q Determine the amount of silver in a saturated solution of silveriodide. Sketch a graph showing how the concentration of silverwould change if increasing amounts of potassium nitrate were added.Note, you...
- Q Moles of Reactant to Moles of Product: Use mole ratiofrom balanced chemical equation.1.Ammonia burns in oxygen according to the followingequation:4 NH3 + 3 O2  → 2 N2 + 6H2OHow many moles...
- Q A student was given buffer solutions to calibrate the pHelectrode that were labeled incorrectly. The pH's of both buffersolutions were actually lower than the pH's shown on thelabels. Explain how...
- Q How many grams of copper be deposited at the cathode of anelectrolysis cell if an electric current of 15 mA is applied for1.0 h through an aqueous solution containing excess...
- Q 2.The solubility of silver chromate (Ag2CrO4) is 2.22 x 10-3g/100 mL.a) What is the Ksp? Include the chemical equation and Kspexpression. MW (Ag2CrO4): 332 g/molb) What happens to the solubility...
- Q Question 1Which of the following are variables that can be manipulated ina gas law equation? (Choose all that apply)Group of answer choicesnumber of molestemperaturepressuremassQuestion 2True or False. According to Charles’s...
- Q Question1) A 1.0 mL aliquot (sample) is taken from a 1.0L solution.Which of the following is/are true when comparing the 1.0 mLsolution to the 1.0L solution? Choose all that are...
- Q Justify the phospholipid being the major component of the cellmembrane. Be specific and complete.
- Q If you were to add 10.0mL of 0.10M sodium acetate solution, whatis the amount of CH3COOH(mol), Amount of CH3COO-(mol), and thepredicted pH by the Henderson-Hasselbalch equation?Given:Start with sodium acetateAdd HClInitial...
- Q Most of our discussion of transition metals has focused aroundthem becoming positively charged ions. However, many of thetransition metals will also become negatively charged ions. Usingwhat you have learned from...
- Q 17.11 g of Al2(SO4)3 is dissolved in water to make 500 mLsolution. What is the concentration of aluminum ion and sulfate ionin the resulting solution
- Q -- Consider a concentration cell. Two Ag-electrodes are immersedin AgNO3 solutions of different concentrations. When the twocompartments have an AgNO3-concentration of 1 M and 0.1 M,respectively, the measured voltage is...
- Q Triethlyamine is added with deionized water, what is thechemical equation? Next, this solution is now neutralzied by addingHCL. What is the chemical equation and name of the salt? Finally,NaOH is...
- Q With the completion of the determinations of % potassium, %iron, and % oxalate in the crystals, you may calculate the % water.The percentage compositionof the crystals,KxFe(C2O4)y ·zH2O, has then been...
- Q A 110.1 gram sample of an unknown substance (MM = 189.50 g/mol)is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid =1.62 J/g･°C; heat capacity of gas =...
- Q Design a buffer that has a pH of 8.25 using oneof the weak base/conjugate acid systems shown below.Weak BaseKbConjugate AcidKapKaCH3NH24.2×10-4CH3NH3+2.4×10-1110.62C6H15O3N5.9×10-7C6H15O3NH+1.7×10-87.77C5H5N1.5×10-9C5H5NH+6.7×10-65.17How many grams of the chloride salt of theconjugate acid must...
- Q At a certain temperature, the equilibrium constant for thefollowing chemical equation is 4.00.At this temperature, calculate the molarity (M) of NO2(g) thatmust be added to a starting concentration of 2.73...
- Q expain the phenomenon of catalysis?what are two types if catalysts commonly used ti alter thereaction rate?
- Q 15.) The gallbladder is an intriguing if often overlooked organthat stores bile for the liver in a variety of vertebrates. Abiochemically interesting aspect of the gallbladder is that it isone...
- Q Consider the reaction:8H2S(g)+4O2(g)?8H2O(g)+S8(g)?[H2S]/?t = -0.047M/s .Find ?[O2]/?tExpress your answer to two significant figures and include theappropriate unitsFind ?[H2O]/?tExpress your answer to two significant figures and include theappropriate units.Find ?[S8]/?tExpress your...
- Q A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘ Cand 390.0 Torr at 45.0 ∘ C. Calculate the value of Δ H ∘ vap forthis liquid.Calculate...
- Q what is an ion selective introde theory? can you provide a fulldetailed summary about the theory?*electrode
- Q please i went introduction about method of enzyme assay forreport
- Q if a 4.000gram sample potassium acid phthalate is equivalent to48.37 ml of a sodium hydroxide solution, what is the concentrationof the latter?
- Q Chemical analysis of an unknown compound gives a molarmass of334 g/mol and a percentage composition of 75.42% carbon,6.63% hydrogen,8.38% nitrogen, and the rest is oxygen. Calculate theempirical and molecularformulas for...
- Q 550.0 gallons of 15.0 M nitric acid were added to a lake. Theinitial pH of the lake was 5.70 and the final pH was 4.50 . If noneof the acid...
- Q Calculate the number of moles of ammonia needed to dissolve0.0010 mole of silver chloride in 4000 mL of solution at 25 degreesCelsius. Ksp for AgCl is 1.8 x 10-10 and...
- Q Consider each of the following reactions and decide whether thestandard entropy change for the reaction will be large &positive; or small; or large & negative. 1. large&negative2. large&positive 3.smalla) H2(g)...
- Q A stream of air (21mole% O2, the rest N2) flowing at a rate of30 kg/h is mixed with a stream of CO2. The CO2 enters the mixer ata rate of...
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