Chemistry question and answers for October 05, 2023
- Q importance of discussion in study
- Q Predict the effect on each of the following if the product wasnot completely dried after the recrystallization:(a) percent yield; (b) melting point; (c) IR spectrum.
- Q You are removing imidazole from your pooled nickel columnsamples by dialysis. Thevolume of the pooled sample is 32 mL and the imidazoleconcentration is 0.5 M.a. What is the concentration of...
- Q Rank the following from highest to lowest boiling point1. 0.18 m NH4CH3COO2. 0.14 m Cr(CH3COO)23. 0.13 m CuBr24. 0.45 m Urea(nonelectrolyte)
- Q Using 1.0 nM enzyme X for the enzyme kinetics experiments, youobtained the reaction rates at different concentrations ofsubstrate (shown in the following table). Assume that the enzyme Xfollows a typical...
- Q PleaseI need the procedure on how to solve this questions!Thanks!
- Q Methane is burning with minimum amount of air to form the stableproducts. The premixed methane-air mixture is filled in aleak-proof spherical vessel at an initial pressure of 1 bar and...
- Q Absorbance at 540 nm of Bromocresol Purple DilutionSeriestest tubeconcentration of sample (ug/mL)A540 nmBcP dilution100n/a20.93750.0411:1631.8750.081:0843.750.1551:0457.50.3061:026150.6140:001. The point 0/0 is an important and valid point on this graph.Why? (Explain)Â Â Explain how a hand-drawn...
- Q A gas mixture with a total pressure of 770 mmHg contains each ofthe following gases at the indicated partial pressures: 133 mmHgCO2, 233 mmHg Ar, and 183 mmHg O2. The...
- Q Consider the reaction at 298 KSO2(g) + 2H2S(g) ? 3S(s) + 2H2O(g)The ?G
- Q A coffee cup calorimeter contains 480.0 g of water at 25.0oC. To it are added:380.0 g of water at 53.5 oC525.0 g of water at 65.5 oCAssuming the heat absorbed...
- Q Questions asked after completing quantitative volumetricanalysis of pickling vinegar & NaOH (regular vinegar consists5% acetic acid, CH3COOH. Piclking vinegar consists 7% of theacid).1. Is there a trend in the values...
- Q One of the most popular methods for determine trace amounts ofwater is a coulometric titration, called the Karl Fischer.Measuring trace amounts of water is one of the most challenginganalytical methods.a)...
- Q Consider the tripodal molecule, NH3, under C3v point groupconstraints. Derive a 12 x 12 matrix for the transformationalmatrix of the C3 rotation axis
- Q 1. Your stoichiometry reaction is C → 1/3 DA. You know the reaction order is second order in C. What is therate law for this reaction? (Remember it has three...
- Q Given the following reactions of nitrosyl chloride (NOCl),calculate the ∆H°rxn, in kilojoules per mole, for the thirdreaction. Enter your answer to the tenths place. Don’t forget thesign! 2NOCl(g) ⟶ 2NO(g)...
- Q A) The substance sulfur dioxide has thefollowing properties:normal melting point:200.4 Knormal boiling point:263.1 Ktriple point:1.7×10-3 atm,197.6 Kcritical point:78 atm, 430.7 KA sample of sulfur dioxide at a pressure of 1.00atm...
- Q What is the pH of a solution containing 0.12 mol/L of NH4Cl and0.03 mol/L of NaOH (pka of NH4+/NH3 is 9.25)?
- Q What volume of 0.0100 M KMnO4 solution is required tooxidize 42.5 mL of 0.0190 M FeSO4 in sulfuric acidsolution?
- Q Predict the bond angles in the following molecules.(a) NF3°(b) SO2Cl2°(c) CBr4°(d) F2CO°(e) PH3°(f) HOCl°
- Q 1. What is the fraction 3/260 in scientific notation to 3significant figures?2. Which statement is correct about element? A) sulfur is a goodconductor of heat B) iron is a transition...
- Q Consider this reaction:H2(g) +Â Â Â O2 (g)Â Â Â Â Ã Â Â Â Â Â H2O (g)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â dHo = __________Balance the equation and put the correct number of moles in theequation above. (1 point)Classify the forward reaction as (1) Combustion,...
- Q Michael Farday weighs out 3.12 g. of salicylic acid in a 100 mLflask and adds 1.89 mL of acetic anhydride (density = 1.080 g/mL).Determine the maximum (theoretical) number of grams...
- Q Determine the oxidation number of iodine in each of thefollowing compounds. Be sure to enter your answer as X+ or X-(a)NaI(b)I2(c)IO2(d)I2O7(e)KIO4(f)Ca(IO)2
- Q Assuming complete disassociation of electrolytes which of theseaqueous solutions has the LOWEST freezing point (reminder 1 molal=1mol kg-1) 0.15 molal KCl 0.20 molal methanol 0.40 molal methanol0.10 molal K2O 0.10...
- Q Use Avagadros number to calculate the number of molecules ofH2S, the number of atoms of H, and the number of atoms of S, in5.25 moles of H2S. Show all work...
- Q A 23.33-mL solution containing 1.718 gMg(NO3)2 is mixed with a 30.50-mL solutioncontaining 1.467 g NaOH. Calculate the concentrations of the ionsremaining in solution after the reaction is complete. Assumevolumes are...
- Q Determine whether or not Hg2Br2 will be more soluble in acidicsolution than in pure water.Determine whether or not  will be more soluble inacidic solution than in pure water.will be more solublewill...
- Q Why can the values of the apparant rate constant, Kapp, differbut the values of the true rate constant, k, be indentical in areaction. An example of a reaction this can...
- Q Determine the [OH?] of a solution that is 0.115M in CO32-.The kb value for CO32- is 2.1e-4.Determine the pH and pOH of a solution that is .115 M inCO32-
- Q What will the final temperature of 400 mL sample of water at39.2°C be if 36,555 J of heat were added.a.88.1°Cb.58.2°Cc.77.0°Cd.61.0°CHow much heat is produced when 6.26g of zinc metal reacts...
- Q Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is animportant compound in industry and agriculture.pKa1 = 1.30pKa2 = 6.70Calculate the pH for each of the following points in thetitration of...
- Q Describe the acidity and pKa of hydrogen atoms that are bondedto carbon atoms adjacent to alkenes, as compared to hydrogen atomsbonded to tertiary alkanes. What happens to leaving groups that...
- Q A system contains a 0.1 molar solution of NaCl and a 0.01 Msolution of NaCl separated by an oherise impermeable membrane hatcontains a special sodium-conducting pore called an ionophore. The0.1M...
- Q What are the intermolecular forces involved with CO2?
- Q 3. Ion exchange chromatographya) how can the texhnique be used for qualitative andquantitative purposesb) what are the major advantages and limitations of thetechniquec) describe the nature of the signal (what...
- Q When a conductor e.g. metal or carbon is immersed in aelectrolyte, electric double layer will be formed at the interfaceof the solid electrode and electrolyte. The equilibrium potentialis related to...
- Q Multistep problem that I'm confused on the entire thing:A) The addition of 5E-3 total moles of Zn2+ to a 1.0L solutionof NaCN gives a solution of the complex ion[Zn(CN)4-2](Kf=4.2E19). What...
- Q how does titration of a strong monoprotic acid with a strongbase differ from a titration for a weak monoprotic acid with astrong base with respect to the following a) quantity...
- Q A 10.0 mg sample of a nonvolatile organic compound is dissolvedin 1.0 g of camphor, resulting in a depression of the freezingpoint of 1.33 K.(You will be required to look...
- Q The reaction of HCl with NaOH is represented by the equationHCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)What volume of 0.555 M HCl is required to titrate 17.7 mL of0.359 M...
- Q Explain whether acid can catalyze each of the followingreactions; i.e., whether the reaction is faster at (pH lower than7) than at pH 7:1. Conversion of asparagine to aspartic and isoaspartic...
- Q A solution containing 0.20 g of an unknown non-electrolyte in2.50 g of cyclohexane was found to freeze at 4.5 oC . What is themolar mass of the unknown substance?
- Q Multiple Part Question.For the reaction at 25CCCL4(l) + H2(g) -> HCl(g) + CHCl3(l) Delta H°= -21.83 kcaland delta S°= 9.92 cal/K What is the delta G° for the reaction?What is...
- Q A fuel with the composition of heptane (C7H16) is burned in anelectricity-generating plant, with efficiency 36%. If the fuel hasa specific energy of 26 MJ/kg, calculate CO2 emissions in units...
- Q Here is a scheme describing the keto-enol tautomerizationreaction. Design the catalytic site of an enzyme that wouldaccelerate the rate of this reaction. The rate enhancement shouldbe as great as possible....
- Q What is The reaction scheme for the recovery ofs-(+)-Ibuprofen from the diastereomeric salt .
- Q The concept of energy charge is a very useful way to think abouthow ATP levels control pathway activity. Discuss the role of ATP inthe glycolytic pathway (between glucose and pyruvate...
- Q A 0.6747 gram tablet containing CaCO3 (100.087 g/mol) is addedto a flask along with15.00 mL of 2.000 M HCl.???? ?? +2??? ?? →???? ?? +?? ? +??(?) 3 222Enough water...
- Q Balance the followinh equation for the oxidation-reduction reactionoccurring in an acidic solution, shoe all work, steps.IO3- + N2H4 -> I- + N2
- Q The minor condensation product formed by intramolecular aldolcyclization of octane-2,6-dione has a quartet absorption peak inthe 1H NMR spectrum. What is its structure?
- Q 1. Glucokinase and hexokinase perform the same enzymatic functionyet their role in carbohydrate metabolism / homeostasis issubstantially different. a. Describe their cellular distribution /locations, functions, enzyme kenetics, and their regulation...
- Q A direct titration of .68311 grams sample of diprotic acid (H2X)requires 37.45 ml of 0.1372M NaOH solution. What is theexperimental molecular weight of this organic acid: H2X+ 2NaOH-------->Na2X + 2H2O
- Q A0.750g of antacid containing NaHCO3 was treated with 25.00mL of0.0800M HCl solution, heated to drive off CO2, and then titrated toa pale blue endpoint with 5.61mL of 0.09132 M NaOH...
- Q 1. How do polypeptides have the following types of effects:autocrine, paracrine, and endocrine2. If you experimentally increase the concentration of Na+outside a cell while maintaing other ion concentrations as theywere,...
- Q Find the ph for 0.350M of RbF
- Q levels of protein structure
- Q 10.00mL 5% acidity vinegar was used titrate with NaOH whosemolarity is 0.1030M.Exp. #Concentration of NaOHInitial volume of NaOHFinal volume of NaOHVolume of NaOH used for titration10.1030M5.50mL21.65mL16.15mL20.1030M3.60mL19.00mL15.40mL30.1030M19.00mL35.91mL16.91mLThe vinegar was diluted to...
- Q Calculate the Ecell value at 298Kfor the cell based on the reactionFe3+(aq)+Cr2+(aq) -->Fe2+(aq)+Cr3+(aq)when[Fe3+] =[Cr2+] = 1.50x10-3 M and[Fe2+]= [Cr3+] = 2.5x10-4 M?
- Q 1. You may have already noticed that the shape of yourspectrophotometric titration curve is quite different than theshapes of the potentiometric titration curves which you haveconstructed in earlier experiments. Why?...
- Q The boiling point of an aqueous solution is 101.42 °C. What isthe freezing point?
- Q 10 mL of bleach with an unknown concentration is added to a100mL volumetric flask. The solution is then finished withdeionized water. 10 mL of this diluted bleach solution is thenadded...
- Q Calculate the pH of each of the following solutions. (Assumethat all solutions are at 25°C.)(a)    0.145 M acetic acid(HC2H3O2, Ka =1.8 ✕ 10−5)(b)    0.145 M sodium acetate(NaC2H3O2)(d)    0.145 MHC2H3O2 and 0.145 MNaC2H3O2hey so these are...
- Q For each of the following categories of compounds, indicate thetype of liquid chromatography that could be used to separateanalytes in that category. (Drag the appropriate chromatographylabel to the blank next...
- Q A sample of solid magnesium is heated with an electrical coil.If 165 Joules of energy are added to a 14.5 gram sample initiallyat 24.3°C, what is the final temperature of...
- Q I have an unknown mixture of Benzoic acid, DimethylTerephthalate, and Naphthalene dissolved in Dichloromethane. I needto separate the mixture to find the composition using some sort ofacid base reation and...
- Q A 20.0 mL sample of 0.432 M HBr is titrated with a 0.314 M NaOHsolution. The pH after the addition of 35.0 mL of NaOH is__________.A.0.04B.1.37C.12.53D.12.63E.13.33
- Q A voltaic cell consists of an Al/Al3+ half-cell and a Cd/Cd2+half-cell. Calculate Ecell when [Cd2+] = 0.00303 M and [Al3+] =0.47 M. You should use the reduction potentials for Al3+...
- Q Give the net ionic equations forthe following:a. AgCl + ZnCl2b. PbCl2 + Hg2Cl2c. Cd(NO3)2 + AgNO3d. HCl + HNO3e. Hg2(NO3)2 +Hg(NO3)2
- Q Consider the reaction A -> products at 312 K.For this reaction it was observed that the first three halflives were 10.7 h, 5.35 h, and 2.675 h when [A] 2.873M....
- Q 15) Name two materials that are theoretically strong enough tobuild a space elevator.?Please explain in clear words. Thanks
- Q Without doing detailed calculations, indicate which of thefollowing electron transitions in the hydrogen atom results in theemission of light of the longest wavelength. Explain why.a. from n = 1 to...
- Q Starting from the first and second law of thermodynamics, derivethe fundamental equation for A in its natural variables. a) Derivethe Maxwell relation that s related to this equation. b) Show...
- Q The law of mass conservation is another fundamental law inchemistry. this law states that matter can neither be created ordestroyed, which means that in a chemical reactions where all thereactant...
- Q Consider the titration of 100.0 mL of 0.016 M HOCl(Ka=3.5×10?8) with 0.0400 M NaOH.1) How many milliliters of 0.0400 M NaOH are required to reachthe equivalence point?2) Calculate the pH...
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