Chemistry question and answers for August 31, 2023
- Q A buffer solution contains 0.424 Mammonium chloride and0.235 Mammonia.  If 0.0297 moles of potassiumhydroxide are added to 225 mL of thisbuffer, what is the pH of the resulting solution?  (Assume that the...
- Q Some special GC detectors, such NPD and FPD, are often used toanalyzed nitrogen containing and phosphorus containing pesticides,respectively, because these detectors have higher sensitivity thanFID for the above-mentioned chemicals (T...
- Q Draw the Sn1 intermediate and Sn2 transitions state for bothethyl-2-chloroacetate and benzyl bromide (α-bromotoluene). Usethese structures to explain the differences in reactivity betweenthese two compounds.
- Q The equilibrium constant, Kc, for the followingreaction is 1.80×10-2 at698 K.2HI(g)-->H2(g) +I2(g)Calculate the equilibrium concentrations of reactant and productswhen 0.257 moles of HI areintroduced into a 1.00 L vessel at...
- Q A buffer solution contains 0.350 M NaHSO3 and 0.387 M Na2SO3.Determine the pH change when 0.104 mol HNO3 is added to 1.00 L ofthe buffer.pH change =This is all the...
- Q Should the order of spots of molecules on the TLC be differentwhen two different eluent solvents are used? Explain youranswer?Should the TLC spot of a compound move higher or lower...
- Q 1a) A 2.95 g sample of an unknown chlorofluorocarbon (an organiccompound containing chlorine and fluorine) is decomposed andproduces 581 mL of chlorine gas at a pressure of 752 mmHg and...
- Q distinguish between analytical concentration and equilibriumconcentration.1- why do we say \"error is inevitable\"?2- please distinguish between precision and accuracy.
- Q With work shown1) How many moles of H2O will be produced if 6.80 x 1024 formulaunits of NH4NO3 are decomposed in the reaction given below?NH4NO3 -------- N2O + 2H2O2) Aspirin...
- Q If you started with 0.100g of tetraphenylcyclopentadienone and0.100g of diphenylacetylene and obtained 0.089 g ofhexaphenylbenzene from the experiment. Calculate percent Yield ofhexaphenylbenzene?Tetraphenylcyclopentadienone MolarMass= 384.478g/moldiphenylacetylene MolarMass = 178.24 g/mol
- Q Solid Investigation Question:What is the identity of an unknown solid piece of metal?Specific questions:1. What are the observable physical properties of yoursample?2. If provided with a table of densities of...
- Q Order these elements from MOST to LEAST reactive and explainyour reasoning.Ag, Cu, Fe, H, Mg, Ni, Pb, Sn, Zn
- Q A reaction between substances A and B has b been found to givethe following data:3A+2B--->2C+D[A][B]Rate of appearance of Cmol/Lmol/Lmol/L-hr1.0 x 10^-21.00.300 x 10^-61.0 x 10^-23.08.10 x 10^-62.0 x 10^-23.03.24 x...
- Q Read up on the phenomenon called the common ion effect in yourtext. You add a small amount of NaOH to a testtube containing cadmium nitrate solution. Initially nothinghappens, but as...
- Q Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determineΔSuniv.Predict whether or not each reaction will be spontaneous.ΔH∘rxn=− 118 kJ , ΔS∘rxn= 261 J/K ,T= 294 KΔSuniv = ??? (J/K)ΔH∘rxn=...
- Q Pure magnesium metal is often found as ribbons and can easilyburn in the presence of oxygen. When 3.50 g3.50 g of magnesiumribbon burns with 8.91 g8.91 g of oxygen, a...
- Q for polyurethanes and epoxy polymers write out the relevantchemical reactions involved on polymerization and cross linking.Indicate the functionality of the monomers being used.
- Q correct the mistakes in this statementA vacancy is a point defect thatoccurs when an atom is missing from a lattice position. A perfectmetal crystal would exhibit ductile behavior. Amorphous crystalshave...
- Q C60-->CH4+CO3^2?Give the complete balanced oxidation-reduction reactionoccurring in acidic solution.
- Q 1. A 2.168 gram sample of an organic compound containing C, Hand O is analyzed by combustion analysis and 5.607 grams of CO2 and1.148 grams of H2O are produced. In...
- Q balance potassium permanganate and oxalate redox reaction
- Q A buffer contains 0.150M acetic acid and 0.105M in sodiumacetate.a) Calculate the pH of the buffer.b) What is the volume of 6.0M NaOH must be added to raise the pHof...
- Q 1. A hot solution of a particular compound was allowed to coolto room temperature. After waiting a few minutes, it was noticedthat the crystallization had not taken place. Discuss two...
- Q what significance does electronic notation have to thestudy of plastics?
- Q When the partial pressure of O2 in venous blood is 30torr, the saturation of myoglobin with O2 is ______while the saturation of hemoglobin with O2 is______.a. 0.55, 0.91b. 0.91, 0.55c....
- Q . Carcinogenic nitrosamines are produed from amines such asdimethylamine and nitrous acid according to the followingmechanism: HNO 2 + HNO 2 → H 2 O + N 2 O 3...
- Q When a lithium nucleus reacts with a proton according to thereaction 7Li + 1H -> 2 4He, 3.1 x 10^-29 kg of mass converted toenergy. Calculate the energy released per...
- Q Determine the [OH-], [H+], pH, and pOH of each of the following:a. 0.29 M Sr(OH)2 b. A 2.50 L solution prepared by dissolving 15.6g of KOH in distilled water. c....
- Q 1) Phosgene (carbonyl chloride), COCl2, is an extremely toxicgas that is used in manufacturing certain dyes and plastics.Phosgene can be produced by reacting carbon monoxide and chlorinegas at high temperatures:CO(g)+Cl2(g)?COCl2(g)Carbon...
- Q 1. Suppose the following reaction takes place:2A+B+C----->products. The following observations are made:Halving the ]A] halves the rate of reaction, trippling the [B] hasno effect f the rate of reaction, and...
- Q Write the wavefunctions describing all 4 bonds in methanemolecule using the VB theory.
- Q If He(g) has an average kinetic energy of 4450 J/mol undercertain conditions, what is the root mean square speed of F2(g)molecules under the same conditions?
- Q What are some of the advantages and disadvantages of using anion trap and a mass analyzer?
- Q Which conformer is more stable and by how much?1)equatorial 2-methylcyclohexanone 2) axial2-,ethylcyclohexanonefor each conformer, draw out the expected major product (withstereochemistry) for addition of methyl magnesium bromide.
- Q Question 2 options:For the reaction  CH4 + O2 →CO2 + H2OCH4 + O2 →CO2 +H2Owhat are the coefficients for each reactant or product?a. CH4b. O2c. CO2d. H2OQuestion 3 (2 points)Question 3...
- Q True or False1. Zaitzeff's rule is usefull for predicting the regiochemistryof electrophilic addition reaction ?2. Markovnikov's Rule is usefull for predicting theregiochemstry  of electrophilic addition reaction ?3. A Alkene bromination reaction...
- Q In an experiment like the one you will complete, a studentcollected the following data. Use this information to complete thequestions below. YOU MUST SHOW ALL CALCULATIONS.Change in Mass of Anode:...
- Q Question: Calculate The PH Of A 0.080 M Carbonic Acid Solution,H2CO3(aq), That Has The Stepwise Dissociation ConstantsKa1=4.3x10^-7 And Ka2=5.6x10^-11.
- Q Glucose, Sucrose, Fructose, and Amylose. Which carbohydratelisted can be hydrolyzed, and why?
- Q A quantity of 4.50 g CaC2 is reacted with an excess of water at298K and atmospheric pressure. CaC2 (s) + 2 H2O (l) --> Ca(OH)2(aq) + C2H2 (g) Calculate the...
- Q A solution is made by combining 15.0 mL of 17.0 M acetic acidwith 5.50 g of sodium acetate and diluting to a total volume of1.50 L.what is the pKa?what is...
- Q Perhaps you recall that when table salt, NaCl, is added towater, the freezing point of water is lowered. Consider a systemcomposed of a mixture of 2.5kg of ice and 50g...
- Q Molar Mass by Freezing Point Depression I am doing a latenitelab on Molar Mass by Freezing Point Depression. I have asked thisquestion on Course Hero and twice on Chegg and...
- Q The vapor pressure of liquid benzene is 17.7 kPa at 30 ºC and37.7 kPa at 50 ºC. a) Calculate the enthalpy of vaporization ofbenzene. b) Estimate the vapor pressure at...
- Q calculate the mole fraction of a fractionaldistillation? How do I find the mole fractions of differentdistillations given only the refractive index, the temperature andwhich the distillation was acquired, and the...
- Q 1) Explain why there are so few metallic materials withone-dimensional bands. Naming and describe the type of distortionresponsible for this.2) Why are the superconducting critical temperatures ofconventional superconductors often highest...
- Q 1. Olive oil has a saponification value of 190 mg KOH per gram.This means that it takes 190 mg of potassium hydroxide to reactcompletely with 1 g of olive oil.(a)...
- Q Calculate the percent ionization in a 0.1M solution ofhydrofluoric acid (Ka=3.53*10^-4)
- Q Using standard electrode potentials calculate ΔG∘rxn and use itsvalue to estimate the equilibrium constant for each of thereactions at 25 ∘C.A. Cu2+(aq)+Zn(s)→Cu(s)+Zn2+(aq)B. Br2(l)+2Cl−(aq)→2Br−(aq)+Cl2(g)C. MnO2(s)+4H+(aq)+Cu(s)→Mn2+(aq)+2H2O(l)+Cu2+(aq)Find K. All answers must have one...
- Q The electro attractive inductive effect of the alkenyl andalkynyl groups has been attributed to the hybridization ofunsaturated carbon with respect to that of saturated carbon.Discuss the rational basis of this...
- Q Calculate Percent Yield:Palm oil was used for the creation of soap. The mass of the oilwas 2.001 grams. The base used was 3 M of NaOH. After theexperiment, the mass...
- Q when the acid constants of tert-butyl alcohol and methanol aredetermined in the gas phase, tertiary alcohol is found to be astronger acid. This result is opposite in aqueous medium. Considerthe...
- Q What is special about the equivalence point in a titration?
- Q 1. How many grams of ethanol, C2H5OH, can be boiled with 863.7kJ of heat energy? The molar heat of vaporization of ethanol is38.6 kJ/mol. Answer in g.2. How much heat...
- Q A 49.96 mL sample containing La3+ was treated withsodium oxalate to precipitateLa2(C2O4)3, which waswashed, dissolved in acid, and titrated with 18.04 mL of 0.006363MKMnO4. Calculate the molarity ofLa3+ in the...
- Q The Keq for the conversion of A to B is 1.15 x 10-3.the Keq for the hydrolysis of ATP to Pi and ADP is 2.24 x105. the net conversion of...
- Q Part A Identify the nuclide produced when neptunium-237 decaysby alpha emission: 237/93Np→4/2He + ? Express your answer as anisotope using prescripts.Part B Identify the nuclide produced when phosphorus-32 decaysby beta...
- Q Calculate ΔGº at 25ºC for the reaction H2 + I2 D 2HI. Startingwith 1.0 atm H2 and 1.0 atm I2, What is ΔG when: 0.1%, 1%, 10%,50%, 90%, 99%, and...
- Q Q: Blood Lactate Levels during Vigorous Exercise. Theconcentrations of lactate in blood plasma before, during, and aftera 400 m sprint are shown in the flowing graph.a. What causes the rapid...
- Q Write a net ionic equation for the reaction that occurs whenmanganese(II) sulfide and excesshydrochloric acid (aq) are combined.
- Q In an experiment to study the reactivity of Sn(s), Ga(s), Be(s),and Pd(s), the following reactions were observed:2 Ga(s) + 3 Sn2+(aq) -> 3 Sn(s) + 2Ga3+(aq)Ga(s) + Be2+(aq) -> (No...
- Q Use the density and molecular weight of limonene, linalool, andnonane to calculate the volumes of the compounds you will need tomake the stock solution of 50 nM. Also calculate the...
- Q How much heat in kilojoules is required to warm 10.0 g of ice,initially at -20.0 ∘C, to steam at 105 ∘C. The heat capacity of iceis 2.09 J/g∘C and that...
- Q For ethane, Pc = 48.2 atm and Tc = 305.4 K. Calculatethe pressure exerted by 50.0 g of C2H6 in a200-cm3 vessel at 37.5°C.(c) the Redlich–Kwong equation; (d) the virial...
- Q How is NMR techniques better than IR? please provide detailedpros and cons.Many thanks
- Q 1. Why does E. coli need both DNA polymerase III and DNApolymerase I?a. The DNA replication is bidirectional; one polymerase is usedfor each direction.b. Each polymerase is specific for only...
- Q Describe how to make 500mL 0.435 M HNO3 from a 6.00M HNO3solution. (Titration Lab)
- Q 100 mL of 0.1 M NaOH solution was poured into 20 mL of 0.2 MH2SO4 solution and mixed well. What was the final pH of themixture?
- Q A 1.198 g sample contains only vitamin C (C6H8O6) and sucralose(C12H19Cl3O8). When the sample is dissolved in water to a totalvolume of 25.3 mL, the osmotic pressure of the solution...
- Q Nitrogen is slightly less dense than is a sample ofair at the same temperature and pressure. Calculate the density ofN2 in g/L, at 1.45 atm at 15 degree Celsius
- Q Give the wavelengths of maximum absorption for each solution asshown in the spectra provided. Use the absorption wavelengths toexplain why the [Ni(H2O)6] 2+ solution appears yellow-green but the[Co(H2O)6] 2+ solution...
- Q calculate how many mL of a 0.32 M solution of HCl must be added toan aqueous solution containing 4 g of Na2CO3 to obtain a solutionat pH = 10. H2CO3...
- Q Propose a detailed sample preparation method for testingtotal sodium concentration in whole blood by Atomicemission
- Q NH4NO3(s) <---> N2O (g) +2H2O(g) K = 0.665 at 525KIf a 2L reaction vessel contains 0.65 moles of N2O(g), 1.2 moles of 2H2O (g) and 1.3 moles ofNH4NO3 (s), which...
- Q 4a. For the following reaction, 3.96 grams ofcarbon tetrachloride are mixed with excessmethane (CH4) . The reaction yields3.67 grams of dichloromethane(CH2Cl2) .methane (CH4) ( g ) +carbon tetrachloride ( g...
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