Chemistry question and answers for July 12, 2023
- Q Howmany milliliter a of 1.0 M NaOH must be added to a 200 mL of 0.10 MNaH2PO4 to make a buffer solution with a pH of 7.50?
- Q Consider the titration of a 27.5 −mL sample of 0.120 MRbOH with0.105 M HCl. Determine each of the following.1) the initial pH2) the volume of added acid required to reach...
- Q For each of the following solutions, calculate the initial pHand the final pH after adding 0.005 mol of NaOH.270.0 mL of pure waterpHinitial, pHfinal270.0 mL of a buffer solution that...
- Q A beaker with 1.90×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q What is the percent yield for the reaction PCl3(g)+ Cl2(g)--> PCl5(g)Â Â if 119.3 g of PCl5are formed when 61.3 g of Cl2reacts with 125.5g PCl3?
- Q The relative acidity between carboxylic acids has been used as ameans for determining the electron-withdrawing or electron-donatingabilities of substituents.a) The pKa of phenyl acetic acid is 4.31, making it a...
- Q What is the pH of a solution in which 52 mL of 0.20M NaOH isadded to 16 mL of 0.160M HCl?
- Q Methane is synthesized with a stoichiometric mixture of CO andH2 that is produced via a large scale coal gasification processCO + 3H2 = CH4 + H2Oover Ni/Alumina catalyst.(a) What is...
- Q coffee is decaffeinated industrially using supercritical CO2.One advantage to using scCo2 is that the polarity of thesupercritical fluid can be tuned by varying temperature, pressureand cosolvent additives. however, the need...
- Q Given KlO3 concentration= .01405 M and Na2S2O3concentration= 0.5300 M, how many moles of triiodide is consumed bysodium thiosulfate and Vitamin C (trial 1 volume of titrant=7.95mL,trial 2 volume of titrant=...
- Q Decide how you will prepare six glucose solutions ranging from 0mg/mL glucose to 2 mg/mL glucose for this laboratory, supportingyour decisions with clear calculations (You must show allcalculations for credit)....
- Q Heat of Vaporization QuestionsWe did a lab where we placed a graduated cylinder upside down ina beaker to observe the air bubble and how it was affected bytemperature. There are...
- Q what is the purpose of circular dichroism spectroscopy?
- Q Consider a one acre field with a 100 ft high layer of air exactlyover the field. Water vapor condenses and forms a 0.1 mm layer ofdew on the surface of...
- Q Which of the following statements is true?a) If single measurements on identically prepared systems giveidentical results, the system is in the eigenfunction correspondingto the measured eigenvalue.b) If a system is...
- Q 1. Consider three, separate samples of gas: ammonia, chlorine,and argon. Each sample hsa a volume of 10.00L, a temperature of35.00 C. Rank these three gasses in order of increasing densittyand...
- Q Could you show me how to convert this problem?A physician has ordered 5600 mg of penicillin V,intramuscularly. If penicillin V were available as 0.80 g/mL ofsolution, how many milliliters would...
- Q Calculate the pH of a 0.177 M aqueous solutionof pyridine(C5H5N, Kb =1.5×10-9) and the equilibriumconcentrations of the weak base and its conjugate acid.pH=   [C5H5N]equilibrium=   M[C5H5NH+]equilibrium=   M
- Q Use the following data to determine the maximum rate at which astandard man can climb a mountain: Blood contains 15.9 wt%hemoglobin (with molecular weight 65,000 g/mol). Each hemoglobinmolecule can carry...
- Q Two metals of equal mass with different heat capacities aresubjected to the same amount of heat. Which undergoes the smallerchange in temperature (You must explain/justify your answer)? a)The metal with...
- Q Calculate the equilibrium concentration of Ag+ (aq)in a solution that is initially 0.130 M AgNO3 and 0.610M NH3 and in which the following reaction takesplace:Ag+ (aq) + 2NH3(aq) <-->Ag(NH3)2+ (aq)...
- Q 1)Ideally, what should the slope of the F- ISE’s calibrationcurve be? What should this value be for an H+ ISE (i.e., a pHelectrode)? For a S2- ISE?2)What is the composition...
- Q How do you use TLC to determine the identity and purity ofE-stilbene and stilbne dibromide. Also, refrecing intermolecularforces predict how stilbene dibromide would move on a TLC platerelative to E-stilbene
- Q when looking at a reaction. .how am I suppose to knowwhat it produces?
- Q 1.)Gas          Number of molesN2                   3.10O2                   0.76CO2                0.12If the total pressure is 1.07 atm, what is the partial pressureof Oxygen? (Your answer will be in atmospheres, but do NOT includeunits - Blackboard won't allow them....
- Q 1, When 4.0 mole of LiI is dissolved 1000.0 ml of water, whatresulting molality (m) is used to calculate the change in boilingpoint of the water.2, What mass ( in...
- Q calculate the pH of a liter of 0.10 M ammonium chloratesolution. (kb=1.7x10^-5)show ice chart
- Q How do the partition chromatography model and the adsorptionchromatography model differ in their explanations of howseparations occur in column chromatography?
- Q What are some known inhibitors of photosynthesis andindicate at what location(s) precisely in the electron transferreactions of photosynthesis does this compound inhibit. Provide atleast one such compound.
- Q Lennard–Jones potential diagrams, also called intermolecularpotential energy diagrams, illustrate the relationship between thepotential energy of a molecule as the distance between the twonuclei changes. Select all of the true statements...
- Q A. A solution is made by combining 15.0 mL of 18.5 M acetic acidwith 5.50 g of sodium acetate and diluting to a total volume of1.50 L. Calculate the pH...
- Q At 1 atm, how much energy isrequired to heat 81.0 g of H2O(s) at –24.0 °C to H2O(g) at 141.0°C?=______ kJ
- Q You mix a 133.0 mL sample of a solution that is 0.0100 M inNiCl2 with a 183.5 mL sample of a solution that is 0.220 M in NH3.After the solution...
- Q Exercise 18.62Calculate E∘cell for each of the followingbalanced redox reactions.Part AO2(g)+2H2O(l)+4Ag(s)→4OH−(aq)+4Ag+(aq)Express your answer using two significant figures.E∘cell =   V  Part BBr2(l)+2I−(aq)→2Br−(aq)+I2(s)Express your answer using two significant figures.E∘cell =   V  Part CPbO2(s)+4H+(aq)+Sn(s)→Pb2+(aq)+2H2O(l)+Sn2+(aq)E∘cell =     v
- Q Please show all work.Given:Mass of sodium acetate in acetate buffer - .6708 gVolume of 6 M acetic acid in acetate buffer - 2.05 mLMass of potassium hydrogen phthalate (KHP) in...
- Q Determine the [OH−] of a solution that is 0.120 M in CO32−.
- Q Look at situation where there are 2 molecules of the sameprotein, which means same primary sequence. In addition they foldat the same time in the same funnel. Each protein, which...
- Q 1.For the diprotic weak acid H2A, Ka1 = 2.5 × 10-6 and Ka2 = 7.5× 10-9. What is the pH of a 0.0400 M solution of H2A? What are theequilibrium...
- Q In the sun, 1000g of hydrogen fuses to 993g of helium while theother 7g of matter is converted into energy using Einstein's famousequation E=mc2, where c is the speed of...
- Q The system described by the reactionCO(g)+Cl2(g)⇌COCl2(g)is at equilibrium at a given temperature when PCO= 0.29atm , PCl2= 0.12 atm , and PCOCl2= 0.62 atm . Anadditional pressure of Cl2(g)= 0.38...
- Q Why is Raman spectroscopy less sensitive than fluorescencespectroscopy?
- Q Part A) Twoidentical pieces of machinery are lifted from the sidewalk to theroof of a 100.0 m tall building. One is lifted directly to thebuilding's roof and has a change...
- Q Buffer capacity is a measure of a buffer solution\'s resistanceto changes in pH as strong acid or base is added. Suppose that youhave 175 mL of a buffer that is...
- Q What are the functional group and the fingerprint regions inmid-IR?
- Q A solution contains 1.694 g of cobalt sulphateCoSO4per litre.Calculate: (1.5)a) the volume of 0.008640 M EDTA solution requiredto titrate 25.0 mLof the cobalt solution. b) the volume of a0.009450 M...
- Q The formate ion, (CHO2-), is related tothe acetate ion and forms ionic salts with many metal ions. Assumethat 11.874 g of M(CHO2)2 (where M representsthe atomic symbol for a particular...
- Q A sample of potassium hydrogen phthalate (KHC8H4O4), which is anacid, with a mass of 0.7292 g is dissolved in water and used tostandardize a solution of cesium hydroxide. An endpoint...
- Q 8.00g of NaOH are dissolved in water to make 3.00L of solution.What is the concentration of hydronium ions, [H3O+], in thissolution?
- Q Heat of Combustion and EnthalpyThe heat of combustion of hexane is 45.6 kj/g. If you burn allof a 1.20 g sample of hexane, and all of the heat is transferred...
- Q a) Calculate the molar mass of 118.8 g of an anesthetic gasthat occupies 13.46 L at temperature and pressure of 22°C and 1.08atm, respectively.b) Chemical analysis showed that thegas contained...
- Q The formate ion, (CHO2-), is related tothe acetate ion and forms ionic salts with many metal ions. Assumethat 11.874 g of M(CHO2)2 (where M representsthe atomic symbol for a particular...
- Q Determine the pH of the solution when 30.00 mL of 0.2947 M NH3is titrated with 10.00 mL of 0.4798 M HCl.
- Q A beaker with 1.10×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q Consider the titration of 0.100 M HCl, a strong acid, with 0.100M NH3, a weak base: HCL(aq)+NH3(aq)---NH4+(aq)+H2O(l) Calculate thepH at the following points in the titration when 25.0 mL of...
- Q If a solution containing 84.363g of mercury(II) Chlorate isallowed to react completely with a solution containing 14.334g ofsodium sulfide, how many grams of solid precipitate will be formed?How many grams...
- Q A.) What is the pH of a solution that contains 50.00 mL of 0.10M NH3 to which 60.00 mL of 0.10 M HCl has been added? (pleaseinclude equation, table and...
- Q This is a Multiple part question. Please write step by step thatway I can study from this problem. Thank you.(a).Complete the following equilibrium table.2HI(g)      ⇌  H2(g) + I2(g)Initial                         0.1600 M        0         0Change                                                           ─────────────────────────────Equilibrium    (b)....
- Q 1.810 g chlorine in methanol is added to 2.200 g of zinc metal.After the reaction is complete, the remaining unreacted zinc wasweighed as 0.5260 g. Using the masses of the...
- Q a. Describe the preparation of 2 liters of 0.1 M Glutamatebuffer, pH 10.0. You have available monosodium glutamate (MW=169),0.5M NaOH and distilled water. b. Momentarily distracted by havinga piece of...
- Q Part A: For which of the following reactions is ΔH∘rxn equal toΔH∘f of the product(s)? You do not need to look up any values toanswer this question.2Li(s)+F2(g)→2LiF(s)S(s)+O2(g)→SO2(g)Li(s)+12F2(g)→LiF(s)SO(g)+12O2(g)→SO2(g)SO3(g)→12O2(g)+SO2(g)Li(s)+12F2(l)→LiF(s)Part B: The combustion...
- Q 1. Methanol (CH4O) can be made by a reactionbetween carbon monoxide gas and hydrogen gas. Methanol is the onlyproduct of the reaction.a) Starting with 75.0 g of each reactant, calculate...
- Q Calculate the pH of a 5.0 M H3PO4 solutionand the equilibrium concentrations of the speciesH3PO4,H2PO4-,HPO42- and PO43- (ka1 =7.5 x 10-3, ka2 = 6.2 x 10-8, ka3 = 4.8 x10-13)
- Q Within what pH range can Cu2+ be separated from Fe2+ if theirconcentration is both 0.1M and H2S concentration is 0.01M? Show allcalculations to support your answer. (KCuS = 1.2x10^-36; KFeS...
- Q b. When the volume of the flask is determined, themass of the air is not important. Explain why. c. Explain why weconsider the mass of the air in the\"empty\" flask...
- Q Question:1 In the introduction of this experiment, there areseveral factors that are discussed as having an impact upon therate of a reaction. Pick one of these factors and come up...
- Q Discuss the use of Ksp to separate AgCl from AgBr andAgI, by using NH3 (find the necessary Ksp andKf values).
- Q 1. If a small amount of strong base were added to a buffer madeof a weak acid HA and the lithium salt of its conjugate base, LiA,the pH does not...
- Q A mixture of KClO3 and KCl with a mass of 0.950 g was heated toproduce O2. After heating, the mass of residue was 0.840 g.Assuming all the KClO3 decomposed to...
- Q a solution consists of 0.050 M Mg2+ and Cu2+. Which ionprecipitates first when OH- is added? write out the equation foreach and indicate the Ksp?
- Q Write equations for the reactions investigated. Label Sn1 orSn2.1)Butyl bromide in 15%NaI-acetone2)Butyl bromide in 1%ethanolic silver nitrate3)Butyl chloride in 15% NaI-acetone4) Butyl chloride in 1% ethanolic silver nitrate5)Sec-butyl chloride in...
- Q The Ksp of AgI is 8.3× 10–17. You titrate 25.00 mL of 0.08970 MNaI with 0.05190 M AgNO3. Calculate pAg after the following volumesof AgNO3 are added:1) 36.30 mL2) Ve3)...
- Q Complete combustion of 7.60 g of a hydrocarbon produced 23.0 gof CO2 and 11.8 g of H2O. What is the empirical formula for thehydrocarbon? I got C4H10 but was incorrect.
- Q a mixture of 73.0 g NH3 and 73.0 g HCl are made toreact at stp according to the equationNH3 + HCl --> NH4ClWhat is the volume of gas remaining and...
- Q Consider the combustion of coal with a a given heat of formation inexcess air, and answer the following question:http://i.imgur.com/QKPqD7U.png
- Q solution              mLH2O2                   mLKI                rate (mL O2/s)1                         5.0                            10.0                         ?2                         10.0                          10.0                         ?3                          5.0                             20.0                       ?Rate Law: since doubling either [H2O2] or [I-] doubles thereaction rate, what is the rate law?
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