Chemistry question and answers for July 20, 2023
- Q Describe the 3 types of membranes commonly used to separate thetest solution from the internal reference electrode.
- Q Please provide formula!Molecular weight of chemical A is 40. To make 1 liter of 1molarsolution, how much should you use? Specify unit. And to make50militer of 50millimolar solution, how much...
- Q 1.What would be a spectroscopic method to distinguish betweenthe the impurity and the triphenyl methanol?2.What is one of the common by-products formed in this reactionand how is it separated from...
- Q Use the data below from an electron impact mass spectrum of apure compound to deduce its structure. Draw your structure in thedrawing window.Data selected from the NIST WebBook,http://webbook.nist.gov/chemistry/m/zRelative intensity6632641004926297228832760Â 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 I wrote...
- Q The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 =7.44. Calculate the pH at each of the following points in thetitration of 50.0 mL of...
- Q A 26.0-g aluminum block is warmed to 65.1 ∘C and plunged into aninsulated beaker containing 55.5 g of water initially at 22.3 ∘C .The aluminum and the water are allowed...
- Q Hess’s Law Problem: Show your work neatly and methodically.1. From the enthalpies of reaction PUT *** BY ANY REACTIONS THATCORRESPOND IN A ΔH FORMATIONH2(g) + F2(g) ---->2 HF(g) ΔH =...
- Q Consider the following reaction: Fe3+(aq)+SCN−(aq)⇌FeSCN2+(aq) Asolution is made containing an initial [Fe3+] of 1.2×10−3 M and aninitial [SCN−] of 7.8×10−4 M . At equilibrium, [FeSCN2+]= 1.7×10−4M .Calculate the value of...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.100 M HClO(aq) with 0.100 M KOH(aq). Theionization constant for HClO can be found here.(a)...
- Q For a particular reaction at 234.1 °C, ΔG = -832.94 kJ/mol, andΔS = 923.32 J/(mol·K). Calculate ΔG for this reaction at -105.7°C.
- Q Why is the molar heat in a reaction between HCl and NaOH greaterthan in a reaction between HOAc and NaOH
- Q Sodium fluoride adopts the NaCl (FCC) structure type. Estimatethe lattice energy, ΔU, for NaF using the Born–Lande equation. Thebond length for Na–F is 235 pm, and the Madelung constant is1.7476....
- Q In a certain chemical reaction, there is a decrease in thepotential energy (chemical energy) as the reaction proceeds. (a)How does the total kinetic energy of the particles change? (b) Howdoes...
- Q Metals that can have multiple charges?
- Q Consider the titration of a 23.2 −mL sample of 0.115 M RbOH with0.110 M HCl. Determine each of the following. 1)the initial pH. 2)the volume of added acid required to...
- Q Calculate the ratio of the energy released by the completefission of 1.0 kg of Uranium-235 to the energy released by burning1.0 kg of methane, CH4. You can use the fact...
- Q The Ka of a monoprotic weak acid is 7.85 × 10-3. What is thepercent ionization of a 0.136 M solution of this acid?
- Q Ethyl alcohol has a vapor pressure of 20 mm Hg at 8 C and anormal boiling point of 78.4 C.Estimate the vapor pressure at 45 C using (a) the Antoineequation(b)...
- Q 1.) Use a table of Standard Reduction Potentials to predict if areaction will occur when Mg metal is put into a 1Maqueous H+solution.If a reaction will occur, write a balanced...
- Q Calculate the concentrations of all species in a 1.21 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.NaSO3HSO3H2SO3OHH
- Q How do you choose an appropiate indicator for a titration?Why it is important to use such a small quantity of indicator ina titration?What is the difference between the end point...
- Q Given the following equilibrium:Br2 (g) + F2 (g) <----> 2 BrF (g)Kc = 54.7 at 300 KAn evacuated flask is charged with 2.2 atm of Br2 and 2.2 atm ofF2...
- Q Calculate the anticipated pH for each of the solutions thatresulted when you added HCl or NaOH to the \"buffer\" beaker. Enterthe data in the tables below.Buffer: (.100M NaC2H3O2 and .100M...
- Q Physical Chemistryhurricanes form when water vapor at the surface of the ocean(ca.80 F) exchanges with the high altitude cooler air (ca. -120 F).During the ascent, the coriolis force of the...
- Q Calculate the concentrations of all species in a 0.950 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.
- Q The IR spectra of the bis-dimedone derivative and theoctahydroxanthenedione derivative should have significantdifferences in the frequency of the carbonyl stretch. Explain thereason for this difference.
- Q 1. Consider the gas-phase reaction of PCl5, for which theequilibrium constant has the value of 11.5 at 300 degreesCelsius:PCl5 (g) <---> PCl3 (g) +Cl2 (g)a. Suppose enough PCl5 is placed...
- Q 1) When an abundance of amino acids occurs in the body, excessnitrogen has to be removed.OnewayinwhichthisisdoneisbyUreaSynthesis.Part A: Describe the metabolic pathway in which Urea isproduced, starting with free ammonium (NH4+)...
- Q Consider the titration of 70 mlof 0.25 M hydrazine, N2H4 titrated with 0.35 M HBr. (Kb= 1.3 x10-6).A. Write the reaction equation for above reaction.B. Calculate the volume of HBr...
- Q 1)Which of the following would be expected to be the mostsoluble in water?butanolproanolpropane2) Liquid hexanol(C6H13OH)has a normal boiling point of 158 °C and liquiddecanol(C10H21OH)has a normal boiling point of 233...
- Q You are titrating 120.0 mL of 0.080 M Ca2+ with 0.080 M EDTA atpH 9.00. Log Kf for the Ca2+ -EDTA complex is 10.65, and thefraction of free EDTA in...
- Q Draw a simple molecular orbital diagram for the followingmolecules. O22....N2+.... C22- '''a. Is the ionparamagnetic or diamagnetic? b. What is the bond order in the ion?c. Would these ions have...
- Q Draw a simple molecular orbital diagram for the followingmolecules. O22....N2+.... C22- '''a. Is the ionparamagnetic or diamagnetic? b. What is the bond order in the ion?c. Would these ions have...
- Q Answer the following and explain your reasoning briefly.a.Increasing temperature changes the activation energy.True orfalse? b.For a reaction that has the rate lab, rate=k[A]2[B],doubling the concentration of A has what affect...
- Q Draw a simple molecular orbital diagram for the followingmolecules. O22....N2+.... C22- '''a. Is the ionparamagnetic or diamagnetic? b. What is the bond order in the ion?c. Would these ions have...
- Q Consider a one acre field with a 100 ft high layer of airexactly over the field. Water vapor condenses and forms a 0.1 mmlayer of dew on the surface of...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.140M HClO(aq) with 0.140M KOH(aq). Theionization constant for HClO is 4.0*10^-8 which was obtained fromthis...
- Q Ni-en complexIf I desire to make these products, and I start with 5 mL of[Ni(H2O)6] 2+ in each case, what is the amount of (en) ligand thatshould be added to...
- Q 1. The observation that the absorbance is linearly proportionalto the concentration of dye is a statement of which law?2. For this question, note that you diluted your prepared drinkmix 1:10...
- Q Aqueous sulfuric acid H2SO4 will react with solid sodiumhydroxide NaOH to produce aqueous sodium sulfate Na2SO4 and liquidwater H2O . Suppose 92. g of sulfuric acid is mixed with 39.9...
- Q Calculate the pH at the equivalence point in titrating 0.071 Msolutions of each of the following with 0.028 M NaOH.(a) hydroiodic acid (HI) pH =___(b) hypochlorous acid (HClO), Ka =...
- Q a mixture of 50%He and 50% n2 (by volume) at 300k in a 1Lcylinder is compressed in until the volume is reduced by a factorof 4. the final temperature is...
- Q A yellow substance was found to contain 54.5% Carbon, 9.10%Hydrogen and 34.6% Oxygen by mass. What is the molecular andempirical formula for the compound if it has a molar mass...
- Q For 500.0 mL of a buffer solution that is 0.185 molL−1 inC2H5NH2 and 0.175 molL−1 in C2H5NH3Cl, calculate the initial pH andthe final pH after adding 0.020 mol of HCl.
- Q in the synthesis of tris(ethylenediamine)nickel (II) chloridedihydrate lab, give me a good introduction in a clear statement ofthe problem or project and the reasons for studying it. Please I amstuck.
- Q 1) What is the enthalpy of reaction,ΔHrxn for the reaction of nitrogen gas with oxygengas to produce NO2(g), based on the followinginformation? These reactions are not at standard state or at...
- Q A coal particle burns in air at 1145 K and atmospheric pressure.The process is limited by diffusion of the oxygen counterflow tothe CO2 and CO that are formed at the...
- Q What is the pH of a 3.4x10-8 M HClO4 solution at roomtemperature?A.7.1B.7.0C.5.3D.6.9
- Q H2SO4 is a strong acid because the first proton ionizes 100%.The Ka of the second proton is 1.1x10-2. What would be the pH of asolution that is 0.100 M H2SO4?...
- Q The AIDS drug zalcitabine (also known as ddC) is a weak basewith the structure shown below and a pKb of 9.8What percentage of the base is protonated in an aqueouszalcitabine...
- Q Solve the following problems. You MUST show your work.1. Consider the following reaction 2 SO2(g) + O2(g) = 2SO3(g)Write the equilibrium expression, Kp2. Consider the following reaction 2 H2O(g) +...
- Q The solubility product constant for La(IO3)3 is 1.00×10-11 at 25oC. What is the molar concentration of IO3- ions in a saturatedsolution of La(IO3)3? Assume an ideal solution at 25 oC.How...
- Q A beaker with 105 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q Calculate the concentration of all species in a 0.135 M solutionof H2CO3. Enter your answers numerically separated by commas.Express your answer using two significant figures.
- Q a volume of 75mL of 0.040M NaF is mixed with 25mL of 0.10MSr(NO3)2. Calculate the concentration of the following ions in thefinal solution (Ksp for SrF2= 2.0x10^-10). [NO3-] [Na+] [Sr2+][F-].
- Q A)Draw the mechanism of bromination of cis-2-butene.B)Explain the stepwise mechanism of the reaction between mercury(II) acetate to ethyleneC)Explain with suitable examples the concept of E-andZ- alkenes. Is there any difference...
- Q Describe how pseudopellitierene can be separated from compoundsthat aren't amines by solvent-solvent extractions. Discuss theinfluence of acid-base chemistry on solubility properties. Answerthe question in the procedure.
- Q A 0.4423 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to...
- Q Consider the titration of 35.0 mL of 0.260 M HF with 0.215MNaOH. Calculate the pH at each of the following points.Part A.)How many milliliters of base are required to reach...
- Q Using Kröger-Vink notation, write the defect chemical equationfor mixing FeO into Fe2O3
- Q In 30% ethanol, a 440 bp closed circular A-form DNA is in arelaxed form (no supercoil). What are the Lk, Tw and Wr values?(Please elaborate)By transferring the above DNA from...
- Q 50.0 mL of 0.100 M H2SO3 is titrated with0.150 M KOH soluion.a) What is the initial pH of the sulfurous acid?b) How much titrant is needed to reach the equivalence...
- Q Could I have the explanations for the respective questions?Use these answers for questions 8 - 10.(A) a solution with a pH less than 7 that is not a buffersolution(B) a...
- Q A.) Calculate the enthalpy change, ΔH, for the processin which 37.9 g of water is converted from liquid at 4.6 ∘C tovapor at 25.0 ∘C .For water, ΔHvap = 44.0...
- Q Aluminum reacts with chlorine gas to form aluminum chloride viathe following reaction:2Al(s)+3Cl2(g)→2AlCl3(s)What is the maximum mass of aluminum chloride that can be formedwhen reacting 15.0g of aluminum with 20.0 g...
- Q determine the symmetry types for all vibrational modes ofsquare-planar molecules and whether the mode would be IR active orRaman active or neither. show the drawings. HINT the symmetries ofvibrational modes...
- Q Using the aqueous equilibrium constants, calculate theconcentration of OH- in M and pH for the following solutions (giventhat all are at 25 degrees celsius):0.15 M NaBrO8.2×10−2 M NaHS.A mixture that...
- Q Consider the titration of a 23.0 −mL sample of 0.170 M CH3NH2with 0.155 M HBr. Determine each of the following.C) the pH at 6.0 mL of added acid. Express your...
- Q An enzyme was found that catalyzes the reaction betweenstudents, S and academic success, P (for pass); the enzyme wascalled studyase.An enzyme assay was run on studyase. 10μg of studyase (molecularweight...
- Q NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl actsas a weak acid. What is the pH of a solution that is 0.034 M...
- Q As of the writing of this text, EPA standards limit atmosphericozone levels in urban environments to 84 ppb. How many moles ofozone would there be in the air above Los...
- Q 1.Calculate the pH of a 0.075 M soultion of hydrazoic acid,which is a weak acid. Hydrazoic acid, HN3, has an acid dissociationconstant Ka, equal to 1.9 x 10-5. Also, calculate...
- Q 1) a) Calculate the pH of a buffer that is 0.12 M in lactic acidand 0.11 M in sodium lactate. (b) Calculate the pH of a bufferformed by mixing 85...
- Q Physical ChemistryEstimate the bubble point and dew point temperatures of a 25 mol% n-pentane, 45 mol % n-hexane, and 30 mol % n-heptane mixture at1.013 bar.Data:lnP5vap = 10.422 - 26,799...
- Q Find the pH at the equivalence point(s) and the volume (mL) of0.125 M HCl needed to reach the point(s) in titrations of thefollowing. (See this table.) (a) 69.0 mL of...
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