Chemistry question and answers for July 10, 2023
- Q What role do proteins play in the body?
- Q Calculate the concentration of all species present ina 0.01 M aqueous solution of ammonia. The pKa of the ammonium ionis 9.24.1)Calculate [H+] (express the result in molar unitsusing three significant...
- 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 having a piece of...
- Q The acid-dissociation constant for benzoic acid (C6H5COOH) is6.3×10−5.A. Calculate the equilibrium concentration of H3O+ in thesolution if the initial concentration of C6H5COOH is5.1×10−2MB. Calculate the equilibrium concentration of C6H5COO− in...
- Q Separating and Identiying Mixtures by Gas Chromatography Lab 3.For each parameter listed, explain whether or not a change in theparameter will have an effect on the retention time of a...
- Q A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mLof 0.150 M HCl(aq). The equation for the reaction is:CaCO3(s) + 2 HCl(aq) ?CaCl2(aq) + CO2(g) +H2O(l)The excess HCl(aq) is...
- Q For each strong base solution, determine [H3O+], [OH−], pH, andpOH.A)8.89×10−3 M LiOH[OH−],[H3O+] =b)8.89×10−3 M LiOHpH,pOH=C)1.15×10−2 M Ba(OH)2[OH−],[H3O+]=D)1.15×10−2 M Ba(OH)2pH,pOH =E)1.8×10−4 M KOH[OH−],[H3O+]=F)1.8×10−4 M KOHpH,pOH =G)4.9×10−4 M Ca(OH)2[OH−],[H3O+] =H)4.9×10−4 M Ca(OH)2pH,pOH...
- Q Determine the pH of the solution of 100 mL of 0.150 M benzoicacid, HC7H5O2 (Ka=6.3x10-5 ). To this 25.0 mL of 0.400 M KOH isadded, calculate the pH of the...
- Q Show reaction formula as well as if a product is created1.)Potassium sulfate with Copper (ii) Chloride2.)Potassium sulfate with Calcium Chloride3.)Potassium sulfate with Magnesium Chloride4.)Potassium sulfate with Iron (ii) Chloride
- Q A student designs an ammeter (a device that measures electricalcurrent) that is based on the electrolysis of water into hydrogenand oxygen gases. When electrical current of unknown magnitude isrun through...
- Q Self-test 9A.3 The emission spectrum of atomic deuterium showslines at 15 238, 20 571, 23 039, and 24 380 cm−1, which correspondto transitions to the same lower state. Determine (a)...
- Q A different derivation of the freezing point depression beginswith the expressionln xA = −∆fusG/RTand uses the Gibbs-Helmholtz equation. Make the substitution andintegrate over appropriate limits to derive the freezing pointdepression...
- Q Polystyrene has been shown to be soluble in certain terpinenesolvents. From the evidence below, determine the enthaply ofvaporization of the terpinene. (a) Dissolving 2.86 mL of benzene in50.0 g of...
- Q A 1.000 L sample of HCl gas at 25∘C and 732.0 mm Hg was absorbedcompletely in an aqueous solution that contained 6.948 g of Na2CO3and 246.0 g of water. A.What...
- Q in urinalysis when testing for sugar why would sugargive a positive or negative result
- Q A beaker with 2.00×10^2 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 Potassium tetraiodomercurate (K2HgI4) is aqueous solution goesby several names, including Nesslers reagent and Mayers reagent. Itis an effective test for organic alkaloids and ammonia. A typicalbatch is made by dissolving...
- Q What is the significance of the coefficient of linear expansion and what role does it play in engineering design? When is it desirable to join two metals having like coefficients...
- Q Calculate the pH for each of the following cases in thetitration of 50.0mL of 0.160M HClO(aq) with 0.160M KOH(aq).a) before addition of any KOHb) after addition of 25.0 mL of...
- Q a) What role does Yersiniabactin play for Y. pestis?b) Why does Y. pestis need Yersiniabactin to be fatal?c) Circle six donor atoms on the diagram that would bind toFe(III). Justify...
- Q Sustainability Related Questions: 1. What is the phosphorus cycle? 2. What critical role does phosphorus play in the structure of plants? 3. Why do environmentalist worry about the increasing concentration of phosphates in...
- Q Three molecules have similar electron domains, but differentmolecular shapes. Why?The ________ hydrogen orbital overlaps with the ________ bromideorbital in HBr. (Valence Bond Theory)The temperature and pressure specified by STP are...
- Q In benzophenone reduction, how does H-bonding play a role in thedetermination of its physical state?
- Q How does conjugation play a role in the problem below? Pleaseshow the solution to the reaction.
- Q Complete and balance these half-equationsIO3−→I2 (acidic solution)HNO3→N2O(g) (acidic solution)C2O42−→CO2(acidic solution)Cr2O72−→Cr3+(acidicsolution)Express your answer as a net ionic equation. Identify all of thephases in your answer
- Q Briefly explain the difference between CI, MALDI, and ESI. Whattype of molecule would you use for each of these techniques?
- Q How many g of MgCl2 (molar mass = 95.21 g/mol) have to bedissolved to give 100 g of an aqueous solution that boils at 101.50degree C?A) 279gB) 27.9gC) 95.2gD) 93.0gE)...
- Q A 350.0 mL buffer solution is 0.170M in HF and 0.170M inNaF.A. What mass of NaOH could this buffer neutralize before the pHrises above 4.00?B. If the same volume of...
- Q If a 1st order reaction has a rate constant of 2.30 s^-1 at 25degree C, and at a frequency factor of 2.51*10^5, calculate theactivation energy.A) 9715 J/molB)186 J/molC) -186 J/molD)...
- Q Calculate the absorption frequency corresponding to the –C-Hstretching vibration treating the group as a simple diatomic C-Hmolecule with a force constant of k= 5.0 102 N/m. (Hint: use theactual mass...
- Q What would happen to a titration curve if you start with alarger volume of acid compared to one with a smaller volume ofacid?
- Q A solution contains 1.0mg of KMnO4/L. When measured in a 1.00cmcell at 525 nm, the transmittance was 0.300. When measured undersimilar conditions at 500 nm, the transmittance was 0.350. (a)Calculate...
- Q complete and balance the following redox equation. H2S +HNO3=> S+ NO (acidic solution)
- Q A fossil you are radiometrically dating contains 3 microgramsof Uranium 235 and 1 microgram of Lead 207. Uranium 235 decays toLead 207; the half-life of Uranium 235 is 710 million...
- Q Part AWhat volume of 0.105 M HClO4 solution is needed to neutralize46.00 mL of 8.80×10−2 M NaOH?Part BWhat volume of 0.124 M HCl is needed to neutralize 2.88 g ofMg(OH)2?...
- Q What would happen to a titration curve if you start with a largervolume of acid compared to one with a smaller volume of acid?
- Q Using Le Châtelier's principle, explain how the addition ofaqueous ammonia dissolves silver chloride. If HNO3 isadded after the AgCl has dissolved in the NH3solution,it causes AgCl to re-precipitate. Explain by...
- Q home / study / science / chemistry / questions and answers / 1.calculate the amount of na2hpo4�7h2o (in grams) ... Question 1.Calculate the amount of Na2HPO4 x 7H2O (in grams)...
- Q A) A sample of solid copper is heated with an electrical coil.If 72.4 Joules of energy are added to a 11.4 gram sample and thefinal temperature is 38.3°C, what is...
- Q Calculate the theoretical yield for the bromination ofbothstilbenes and cinnamic acid, assuming the presence ofexcesspyridinium tribromide.cinnamic acid - 150 mgcis-stilbene - 100 μLtrans- stilbene - 100 mgpyridinium tribromide - 200...
- 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 Aluminum foil is .003 cm thick. Assume that all of the unitcells are arranged perpendicular to the foil surface. For a 10cm x10cm spuare of the foil, determine:a. The total...
- Q What fuel is being sought in the process of fracking? Providethe organic chemistry name of it and the chemical formula. B. Thefuel combusts in the presence of oxygen and a...
- Q Calculate the Standard Molar Entropy of methanol ( CH3OH) andethanol ( C2H5OH) at 25 celcius or 298.15 K. Once calculatedexplain WHY one has a high standard molar entropy.Given = melting...
- Q 1.) 3RbI + AlF3 <--> All3 + 3RbF2.) BeI2 + BaF2 <--> BeF2+ BaI23.) SrS + H20 <--> SrO + H2SPredict the direction in which the following reactions willproceed in....
- Q Part AAspirin (acetylsalicylic acid, C9H8O4) is a weak monoproticacid. To determine its acid-dissociation constant, a studentdissolved 2.00 g of aspirin in 0.600 L of water and measured thepH. What was...
- Q Explain what is meant by the term statistical weight ofa configuration. Calculate the statistical weight of aconfiguration in which six molecules are equally distributed amongthree energy states.Write them clearly please...
- Q -If 35.00 mL of 0.0200 M aqueous HCl is required to titrate30.00 mL of an aqueous solution of NaOH to the equivalence point,the molarity of the NaOH solution is Blank...
- Q Pre-Lab ( LACTOSE)1. What does heat and/or acid do to proteins like casein?2. What is the purpose of adding calcium carbonate after removalof the casein?3. Explain the purpose and function...
- Q 1) What is the pH of a 0.246 M aqueous solution of sodiumacetate, NaCH3COO? This solution is acidic, basic or neutral?2) The substance benzoic acid(C6H5COOH) is a weak acid(Ka =...
- Q Why would an increase in entropy accompany the hydrolysis of atriphosphate group into a diphosphate and a phosphate group?
- Q 1. Describe the effect on the equilibirum and the pH thatresults from the following additions.a. addition of sodium dihydrogen phosphate to an aqueoussolution of phosphoric acid.b. addition of sodium hydroxide...
- Q 4. Explain why each of the following would or would not be agood buffer system.a. HCl/NaClb. NH4Cl/NH3c. HC2H3O2/NH3e. HONH3Br/HONH2
- Q A buffer is 0.10 M in NH3 and 0.10 M in NH4Cl. What is the pH ofthe solution after the addition of 10.0 mL of 0.20 M of HCl to100.0...
- Q Write ALL net-ionic equations for the reactions occurring foreach cation in the group.a. copperb. bismuthc. cadmiumd. mercurye. tin
- Q 1. The preparation of nanoparticle solutions adds a reducingreagent, sodium borohydride, to an oxidizing agent, hydrogenperoxide. Is it concievable that these two reagents would reactwith each other?
- Q Calculate the pH at the equivalence point for the titration of0.300 M HCN with 0.300M NaOH. (Ka of HCN is 4.9 x 10-10).
- Q 1. The tomato is dropped. What is the velocity, v, ofthe tomato when it hits the ground? Assume 93.9 % of the work donein Part A is transferred to kinetic...
- Q Consider the balanced chemical reaction Cu(s) + 2AgNO3(aq) aïƒ 2Ag(s) + Cu(NO3)2(aq)a) Write the Complete Ionic Equation:b) Write the Net Ionic Equation:c) Assign oxidation numbers to all of atoms/ions in thereaction:Cu...
- Q 1. what is the best wavelength to use to examine the smallestvisible samples? Why?2. If the resolution of an FTIR depends on the distance themirror travels, why are relatively long...
- Q Part A: Calculate the pH of a0.316 M aqueous solution of hydrofluoricacid (HF, Ka =7.2×10-4) and the equilibriumconcentrations of the weak acid and its conjugate base.pH=? [HF]equilibrium= ? [F-]equilibrium= ?Part...
- Q Be sure to answer all parts. Exactly 100 mL of 0.15 M nitrousacid (HNO2) are titrated with a 0.15 M NaOH solution. (a) Calculatethe pH for the initial solution. (b)...
- Q Consider the following reaction with an equilibrium constant of5.10 at 527oC. CO(g) + H2O(g) ⇌ H2(g) + CO2(g) If [CO] = 0.150 M,[H2O] = 0.250 M, [H2] = 0.420 M,...
- Q Determine the pH and the concentrations of all aqueous species(Na+ , H+ , OH– , H3PO4, H2PO4 – , HPO4 2– , and PO4 3– ) in a0.500 M Na3PO4...
- Q Chapter 3, problem 21. An electrochemical battery is used toprovide 1 milliwatt (mW) of power for a (small) light. The chemicalreaction in the battery is: 1/2 N2 (g) + 3/2...
- Q Chapter 3, problem 21. An electrochemical battery is used toprovide 1 milliwatt (mW) of power for a (small) light. The chemicalreaction in the battery is: 1/2 N2 (g) + 3/2...
- Q Now let's consider BrF6- as VSEPR wouldpredict it's structure. There are two different choices for thestructure. What are these two structures and what symmetry pointgroups do they belong to?
- Q Chapter 3, problem 21. An electrochemical battery is used toprovide 1 milliwatt (mW) of power for a (small) light. The chemicalreaction in the battery is: 1/2 N2 (g) + 3/2...
- Q 2mL of lycopene was extracted from 8 grams of tomato paste. Thelycopene was analysed by UV-vis spectroscopy. The absorbance at502nm was determined to be 0.162. The cell length was 1...
- Q 3. What name is used when the equilibrium constant, Kc, equalsthe product quotient, Qc?
- Q Calculate the concentration of all species in a 0.175 M solutionof H2CO3.Enter your answers numerically separated by commas.Express your answer using two significant figures.[H2CO3], [HCO3^-], [CO3^2-], [H3O^+], [OH^−] =
- Q When the following subtances go from liquid to solid, whichwould require the lowest temp for it to freeze: Ar, C6H12, HF,NaCI, Cu Why?
- Q Identify each of the following elements as a metal, nonmetal, or metalloid:(a) Gallium,(b) Molybdenum,(c) Tellurium,(d) Arsenic,(e) Xenon,(f) Ruthenium. Â
- Q For the below unbalanced equations:1. Fe2O3 + Al → Fe + Al2O3If at the beginning of the reactionyou used 25.29 g Fe2O3 and 9.85 g Al, what is the theoretical...
- Q For which of the following are we permitted to make theassumption that the equilibrium concentration of the acid or baseis the same as the initial concentration when  wecalculate the pH of...
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