Chemistry question and answers for September 27, 2023
- Q What amount of solid NaOH must be added to 1.0 L of a 0.12 MH2CO3 solution to produce a solution with [H+]= 3.0×10−11 M ? Thereis no significant volume change...
- Q The leaves of the rhubarb plant contain high concentrations ofdiprotic oxalic acid (HOOCCOOH) and must be removed before thestems are used to make rhubarb pie. If pKa1 = 1.23 andpKa2...
- Q The following is a list of drugs. For this assignment, use anyresources available to you to find the structures and the pKa ofthese drugs. Identify the functional groups on each...
- Q anunknown white solid (X) has a melting point range 120-122C. benzoicacid is a white soild of 121-122C melting point. how can a studentconfirm the identity of the unkown solid (X)
- Q Theactive ingredients of an antacid tablet contained only magnesiumhydroxide and aluminum hydroxide. Complete neutralization of asample of the active ingredients required 48.5mL of 0.187 Mhydrochloric acid. The chloride salts from...
- Q what effect does the binding of co2 and h+ tohemoglobin in the peripheral tissues have in the body
- Q Which of the following statements is/are true?1. Adding more solute in a solution increases its vaporpressure.2. Temperature is inversely proportional to the solubility ofgases.
- Q 1.What is the function of ethanol in this aldolcondensation?A.Ethanol is the solvent for the reaction.B.None of the answers shown are correct.C.Ethanol is used to remove a proton from the carbonyl...
- Q 2. Explain how solubility tests could be used to differentiatebetween: a. a phenol and a carboxylic acid. b. a phenol thatcontains electron-withdrawing groups and a phenol that containselectron-donating groups. c....
- Q Below are some thermochemical data for the dissolutionequilibrium of solid aluminum hydroxide in water:Al(OH)3(s)→Al3+(aq)+3OH−(aq)ΔfH∘/kJ⋅mol−1−1284−538.4−230.02S∘/J⋅mol−1⋅K−185.4−325−10.9Part A Compute ΔrH∘ (Express youranswer in kilojoules per mole as an integer.)Part B Compute ΔrS∘ (Express...
- Q Why are substrate analogs used to monitor enzyme activity?Can you please explain how this works and what the advantagesare? Thank you!
- Q If 1.6 mol cu metal reacts with a solution containing 3.9 molAgNO3, what ions will be present at the end of the reaction?Cu(s) + 2AgNO3(aq) --> Cu(NO3)2(aq) + Ag(s)(please be...
- Q The reaction CO2(g)+C(s)⇌2CO(g) has Kp=5.78 at 1200 K. A)Calculate the total pressure at equilibrium when 4.71 g of CO2 isintroduced into a 10.0-L container and heated to 1200 K in...
- 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 Note: Please provide a professional 4th-year level with a clearexplanation or LEAVE the question for someone else to answer!Hypothetically, if DNA was used as form data storage for digitaldevices, what...
- Q name the three properties that will be varied in lab todetermine how they affect the rate at which solid dissolves intosolution
- Q What is the pH when 30 ml of 1M hydrochloric acid is added to200 mL of distilled water?please writing hot to solve it .
- Q When 50.0 mL of 0.400 M Ca(NO3)2 is added to 50.0 mL of 0.800 MNaF, CaF2 precipitates, as shown in the net ionic equation below.The initial temperature of both solutions...
- Q Consider the titration of a 12.0 mL solution containing 0.200mol/L acetic acid (CH3COOH, Ka = 1.8 x 10-5 ), with a solution of0.250 mol/L KOH. (12 points total) i) Determine...
- Q 6. For the complete redox reaction given here, (a) break downeach reaction into its half reactions; (b) identify the oxidizingagent; and (c) identify the reducing agent.3F2 +2AlCl3 →2AlF3 +3Cl2
- Q Answer the following questions:a) Does an isomer of ethanol have a strong or weak interaction(intermolecular) with the stationary phase in gas chromatography ifthe isomer have a less retention time than...
- Q A- a small volume of cold water is used to cool off a cup ofcoffee that is initially too hot to drink. How many mL of water at4.0oC must be...
- Q A buffer solution contains 0.430 MNaHCO3 and0.284 MNa2CO3.Determine the pH change when0.062 mol HI is added to1.00 L of the buffer.pH change=____
- Q Calculate the expected buffer capacity of the acetate bufferbased on the number of moles of CH3CO2H in the buffer. (hint, youknow the concentration and volume) In other words, how many...
- Q Determine the pH of a 0.150 M benzoic acid solution witha  Ka = 6.5 x 10–5.  - report the answer in three significantfigures
- Q Calculate the mass of sodium acetate (NaC2H3O2) that must beadded to make 100 mL of an acetic acid/acetate buffer at pH = 5.0,given that you will use 5.0 mL of...
- Q 11.5 mL of a 0.399 M sodium phosphate solution reacts with 19.9mL of a 0.192 M lead(II) nitrate solution. What mass of precipitatewill form?
- Q What are some of the challenges to working with proteins ratherthan small chemical compounds?
- Q List 5 reactions to produce Ethyl Bromide and show themechanisms
- Q Each of the following problems relates to the titrationof either potassium hydrogen phthalate (KHP, KHC8H4O4) or citricacid (H3C6H5O7) with potassium hydroxide. Balance each chemicalequation and then proceed to the following...
- Q If a = -15 eV and b = -6 eV, which is the shortest conjugatedcarbon chain molecule capable of absorbing some visible light (andthereby becoming colored)?
- Q A. NaF(aq) and AgNO3(aq). Ifa solid forms when solutions containing these salts are mixed,write the ionic equation.B. NaF(aq) and AgNO3(aq). Ifa solid forms when solutions containing these salts are mixed,write...
- Q For the reaction       A(g) + B(g) + C(g)  \"D(g)    the following data wereobtained at 25°C.Exp’tInitial [A] (M)Initial [B] (M)Initial [C] (M)Initial Rate (mole∙L–1s–1)10.05000.05000.01006.25 x 10–320.10000.05000.01001.25 x 10–230.10000.10000.01005.00 x 10–240.05000.05000.02006.25 x 10–350.20000.30000.3000?????Which choice...
- Q Final Concentration (ppm)absorbance (a.u.)0.0220.9220.0160.8580.0130.5890.0090.4030.0050.174I cannot figure out the first question, y=?Based on the data above and using linear regression, determinethe relationship between absorbance (y) and concentration (x).y = _______ xWhat...
- Q Why are these solved differently? i need an explanationnot just a quick answer.The Ksp of Al(OH)3 is 1.0 x10-33. What is the solubility of Al(OH)3 in0.00010 M Al(NO3)3? answer is(7.2x10^-11)The...
- Q A one-liter bottle of a typical sports drink contains 426 mg ofsodium ions, 113 mg of potassium ions, and 53 grams of sugars, andprovides 190 calories. If sodium chloride is...
- Q The water used in this experiment is sparged with nitrogen toremove any dissolved oxygen. The proton-coupled reduction of oxygenis shown in the following half reaction:O2 + 4 H+ + 4...
- Q Differentiating Metals and Non-Metals discussion forumThe objectives of this discussion forum revolve around thefundamental concepts of atomic theory, molecular structure andproperties, and chemical nomenclature (naming). Your initial postto the forum...
- Q QUESTION 4Calculate the...needed to produce a buffer with a pH of 6.50.(Ka of H2CO3 is4.3*10–7)Directions: Type your answers only.You may scan your paper work and send it to me for...
- Q 1. What is Rf value? List three factors that affect the Rfvalue.
- Q How do you determine if peaks on an emission and excitationspectra are for Raman scattering or Rayleigh scattering?please give example and reasoning
- Q 10. What is the [CH3COOH ]/[CH3COO– ] ratio in an aceticacid/sodium acetate buffer at pH = 4.90? (Ka = 1.8 x 10–5 )a. 0.31b. 0.70c. 1.45d. 2.41e. 4.9011. How many...
- Q 1) At a pressure of 760 torr, formic acid (HCOOH; boiling point= 100.7 oC) and water (H2O; boiling point =100.0 oC) form an azeotropic mixture, boiling at 107.1oC, that is...
- Q Given the Sample Mass (g) is 0.2254 and AgCl Mass (g) is 0.5295,find the percent chloride.[Note: Atomic Mass of Cl is 35.4527g and the Atomic Mass of Agis 107.868.]Please show...
- Q Be sure to answer all parts.At 430°C, the equilibrium constant (KP) for thereaction2NO(g)+ O2(g) ⇆ 2NO2(g)is 1.5×105. In one experiment, the initial pressures of NO,O2, and NO2 are  7.4×10−3 atm, 4.2×10−2...
- Q What change in pH should be observed if 10.0 mL of 0.100 M NaOHis added to 100 mL of a buffer that is 0.100 M inCH3COOH and 0.100 M in...
- Q Compare and contrast all 4 types of distillation
- Q Consider the reaction that you did to deprotonate vanillin usingsodium hydroxide. If the pKa of vanillin is about 7.4, what is theequilibrium constant for the reaction of vanillin with sodiumhydroxide...
- Q Sodium hypochlorite (NaClO) is the active ingredient inhousehold bleach. HClO has a Ka of 4.0 x 10-8 . You aretitrating 30.0 mL of 0.10 M NaClO solution using 0.30 M...
- Q Explain the difference between the properties of ionic andcovalent (molecular) compounds.
- Q BiochemistryCan someone explain what the purification process is for theglobular protein insulin? And clarify its function &importance.
- Q Conformational analysis of a molecule was performed using aglobal-optimisation method where the energy was evaluated usingHartree-Fock (HF) theory. The binding energy of the low-energyconformers with a host complex was then...
- Q 2Cu2++ 4KI → 2CuI + I2+ 4K+ (rxn 1)I2 + 2Na2S2O3 → 2NaI +Na2S4O6 (rxn 2)10.0 mL of a Cu2+ solution of unknown concentrationwas placed in a 250 mL Erlenmeyer...
- Q The energies of the ? MOs obtained from Hückel MO theory for ?sp2 hybridised carbon atoms forming a linear chain are givenby:?? = ? + 2?cos ( ?? ? +...
- Q Therecommended daily dietary intake of calcium for adult men is 1100mg/day. Calcium citrate, Ca3(C6H5O7)2 (MW=498.5g/mol). What mass ofcalcium citrate would be needed to provide the recommended dailyintake of calcium?
- Q If I have 2.5mL of KCl and 3 mL of water.Which one is my solvent? _____________________________Which one is my solute? ______________________________
- Q How do you determine if an element or compund is electron rich?please provide examples.
- Q Lab: Hydrolysis of polyethylene terephthalate using KOH1. Why do we need to keep this reaction well stirred?2. what is the scope of this reaction?3. IR and NMR interpretation of dimethyl...
- Q I am supposed to map out the following and can't figure out howto do it! Can somebody help? The experiment has to do withdetermining the simplest formula of potassium chlorate...
- Q Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71mL of 0.45 M HCl to 51 mL of the buffer. What is the new pH of...
- Q 51.      For a cell based on each ofthe following reactions run at standard conditions, calculate theemf of the cell, the standard free energy change of the reaction,and the equilibrium constant...
- Q Metathesis reactions and net ionic equations:Copper sulfate + Sodium Nitratemolecular equation:complete ionic equation:net ionic equation:driving force:Sodium nitrate + sulfuric acidmolecular equation:complete ionic equation:net ionic equation:driving force:Copper sulfate + Sodium Hydroxidemolecular...
- Q 1. Water is the best choice for use as a crystallization solventwhenever possible. Why?2. Why do you crystallize your product as slowly aspossible?3. Why would n-propyl alcohol, CH3CH2CH2OH be more...
- Q For each of the following pairs of semiconductors, which onewill have the smaller band gap energy (Eg):(a) C (diamond) or Ge,(b) GaAs or ZnSe(c) CdS or NaCl.In each case, explain...
- Q Calculate the molarity of an HCl solution if a volume of 39.54mL of this solution is required to titrate 0.2348 g Na2CO3.(Bromocresol green is used as an indicator).This HCl solution...
- Q Consider the system in which the mineral fluorite, CaF 2 ,dissolves in water. The resultingfluoride ion reacts with water to give HF. We are looking for thesolubility of CaF 2...
- Q 1- How IMAF's would work to dissolve something?2- give me one IMAF example
- Q In treating an industrial wastewater, we add NaOH to remove Cr3+ions (atomic weight) = 52). The chemical equation for thedissolution of Cr(OH)3 isCr(OH)3 (s) ↔ Cr3+ + 3OH-    (Ksp =6.7*10-31)What is...
- Q Consider the three tubes below. Each contains a few drops of thecolor indicator bromothymol blue, which is yellow in acidicsolutions and blue in basic solutions. One tube contains a solutionof...
- Q . Bath salts are typically composed of the ingredientslisted below. Identify each item as being acidic, basic, or neutralwhen dissolved in water. If a particular ingredient does make anacidic or...
- Q a. A buffer solution contains 0.274 MNH4Br and0.379 M NH3(ammonia). Determine the pHchange when 0.103 molHBr is added to 1.00 L of thebuffer.pH after addition − pH before addition =...
- Q 1. By using the Clausius-Clapeyron equation,lnP=??HvapRT+C, derivethe relationship between the vapor pressures, P1 andP2, and the absolute temperatures at which they weremeasured, T1 and T2.Express your answer in terms of...
- Q PLEASE ANSWER ALL QUESTIONS1. (1 pt) ______ Calculate the volume of 0.00500 M stocksolution needed to make 10.00 mL of 0.00300 M solution.            a. 16.7 mL            b. 6.00 mL            c. 0.0600 mL            d. 3.00...
- Q Calculate the mass, in kg, of each sample.1.91×1026 cadmium atoms.4.68×1027 nickel atoms2.11×1027 manganese atoms.2.73×1029 lithium atoms.Express your answer with the appropriate units.
- Q The melting point of a solid compound is reported as a range oftwo temperatures. For example, the literature (known) melting pointof benzamide is 125-128 °C.a.What does the first temperature in...
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