Chemistry question and answers for September 16, 2023
- Q A 50.0-mL volume of 0.15 M HBr is titrated with 0.25 M KOH.Calculate the pH after the addition of 13.0 mL of KOH. Express youranswer numerically.A 75.0-mL volume of 0.200...
- Q Hydrogen fuel has been used in fuel cells or internal combustionengines. Determine the heat of combustion, energy capacity, andcarbon footprint of the fuel.ΔHf H2O(l) = -285.8 kJ/mol
- Q Balance this reaction, show all steps? (Answer given)AsO3 (-3) + MnO4 (-1) ----> AsO4 (-3) + Mn (2+)Answer:5AsO3 + 2MnO4 + 6H+ ---> 5AsO4 + 2Mn + 3H2OPlease show the...
- Q Write balanced net ionic equations for the following reactionsin basic solution.A.S2O32−(aq)+I2(aq)→S4O62−(aq)+I−(aq)Express your answer as a chemical equation. Identify all of thephases in your answer.Part BMn2+(aq)+H2O2(aq)→MnO2(s)+H2O(l)Part CZn(s)+NO3−(aq)→NH3(aq)+Zn(OH)42−(aq)Part DBi(OH)3(s)+Sn(OH)3−(aq)→Bi(s)+Sn(OH)62−(aq)
- Q Identify the molecular geometry for each of the followingtriatomic molecules using the VSEPR model. Then, determine whichmolecules would be expected to have at least one normal mode thatis infrared active....
- Q The reaction of glucose, C6H12O6, to carbon dioxide and water isa common reaction in the body. C6H12O6 (s) + _6__ O2 (g) → __6__CO2 (g) + __6__ H2O (g)If you...
- Q Given the equation: Al2C6 + H2O--> Al(OH)3 + CH4(g)a) If 34.5 grams of Al2C6 is mixed with72.0 grams of water, what mass of Al2C6 isformed?b) If 34.5 grams of Al2C6...
- Q A 30.00-mL solution of HBr was treated with 5 mL of freshlyboiled and cooled 8 M HNO3, and then with 50.00 mL of 0.3650 MAgNO3 with virgorous stirring. Then 1...
- Q What is the percent yield of the solid product when 12.01 g ofiron(III) nitrate reacts in solution with excess sodium phosphateand 5.008 g of the precipitate is experimentally obtained?Fe(NO3)3(aq) +Na3PO4(aq)...
- Q Mg(OH)2 is a sparingly soluble salt with a solubility product,Ksp, of 5.61×10−11. It is used to control the pH andprovide nutrients in the biological (microbial) treatment ofmunicipal wastewater streams. What...
- Q Chemical cold packs used for sports injuries are made with solidammonium nitrate (NH4NO3) and a plastic bag of water. When the bagof water is broken the ammonium nitrate dissolves.NH4NO3(s) -->...
- Q Carbon dioxide reacts with calcium hydroxide according to thefollowing reaction: CO2(g) +Ca(OH)2 (aq) = CaCo(s) + H2O(l) a 5.0 Lcontainer contains 1.0 L Ca(OH)2 solution. CO2 (g) is introduced tothe...
- Q How many milliliters of a 1% w/v epinephrine injection must beused to prepare 20 mL of an injection containing 1:200,000 w/vepinephrine?
- Q What is standardization in acid-base chemistry? What constitutes astandsrd in analytical chemistry? Give types & examples.
- Q A.) In yeast, ethanol is produced from glucose under anaerobicconditions. What is the maximum amount of ethanol (in millimoles)that could theoretically be produced under the followingconditions? A cell-free yeast extract...
- Q PCR;4. A student is using the following PCR cycle conditions toamplify a 384 bp segment of DNA:i) incubate at 95oC for 30 seconds;ii) incubate at 53oC for 30 seconds;iii) incubate...
- Q Calculate the equilibrium compositions due to the decompositionof 1 mole of nitrogen tetroxide at 25C and 1 bar in each of thefollowing cases.N2O4(g) <==> 2NO2(g)   N2O4  : ΔHf (formation) = 9160 joules/mole...
- Q What are two other methods to extract essential oils apart fromsteam distillation? Describe each.
- Q Suppose that a student collects the following spectrophotometricdata to determine the relative concentrations of HMR and MR insolution:The abosorbance at 425 nm was measured to be 0.260 and at 520...
- Q As background, an antacid contains an unknown number ofmilligrams (mg) of CaCO3 per 2.0 g tablet according to the label.(CaCO3: 100.09 g/mol). Based on the questions below, determine themg of...
- Q The stoichiometric relationship between the reactants andproducts of an aqueous reaction can be used to determine differentkinds of information about a reaction, such as the volume of agiven molarity reactant...
- Q When calculating multicomponentdistillation, why is it best to list the components in order ofdecreasing volatility?
- Q 3. a) Calculate the pH of a sodium acetate-acetic acidbuffer solution (Ka= 1.78 x 10-5) inwhich the concentration of both components is 1.0 M. What would bethe pH of thesolution...
- Q What is the role of the Dean-Stark apparatus and why is itfilled with Toluene up to the top of the apparatus?Should we observe any difference in the reaction rate betweenteams...
- Q 100 mL of a solution of compound “X†has the followingproperties:–Molarity: 2M –MW of “Xâ€: 500g/mole–Density of compound “Xâ€: 5.0g/cm3What dilution factor would be required to make a solution of...
- Q How much energy per mole is required to transfer acetic acid, abyproduct of ethanol metabolism from blood to urine. The relevantconcentrations are 33.00 and 674.00 ppm respectively and you arerunning...
- Q A solution is 0.010 M in each of Pb(NO3)2, Mn(NO3)2, andZn(NO3)2. Solid NaOH is added until the pH of the solution is 8.50.Which of the following is true?Pb(OH)2, Ksp= 1.4...
- Q Indicate how the pKa of the ionizable group of histidine wouldbe changed in a nonpolar pocket (increase/decrease) PLEASE EXPLAINWHY. I thought it would increase but that's not correct
- Q a)What is the value of ∆H of the following chemical reaction?NaOH(aq)       +      HCl(aq) ----->NaCl(aq)   +            H2O(l)     +               55.216 kJb) Use the above equation to calculate the amount (in moles) ofthe water produced if you...
- Q Sublimation is an example of a zero-order reaction. Provideother examples, and explain why the reactant available forreactions is unaffected by changes in the overall quantity of thereactants.
- Q a.      Discuss which technique,simple distillation or fractional distillation, shall be the mostefficient on purifying the mixture of solvents? Elaborate   (4 points)b.     Which solvent should bedistillated first, cyclohexane or Toluene? Elaborate.(3...
- Q The following information is to be used for the next twoquestions. Molar absorptivity data for the cobalt and nickelcomplexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =5520 at 510...
- Q A bomb calorimeter is filled with 9 atm of an unknown gaseoushydrocarbon fuel and an excess of oxygen gas at a temperature of20.5 °C. The bomb calorimeter has a volume...
- Q A) What is the Hrxno in (kJ) for thereaction below, given the relevant table on the info sheet. PbO(s)+ 2HBr(g) ---> PbBr2(s)+H2O(g).a) -273b) -229c) -265d) Not enough information provided.B. What...
- Q You have 0.4mL of acetic acid and 0.4mL of isoamyl alcohol forthe experiment. Which is the limiting reactant?
- Q Ina gel filtration experiment, Be of unknown protein is 22mL whileblue dextran is eluted in 8mL. The total volume gel in the columnis 15mL. Calculate distribution/partition coefficient of theunknown protein....
- Q What is the ground electronic configuration of phosphorous? Howmany microstates does this configuration contain? Write the spinarrow diagram for phosphorus. Derive the term and state symbols.How many microstates does each...
- Q Which of the following is the definition of spectralinterference in plasma and flame atomic emissionspectrometry?Spectral interference can alter the aspiration, nebulization,desolvation, or volatilization processes.Spectral interference occurs due to the oscillation...
- Q There are two sodium acetate solutions. Their apparentconcentrations are 1.00 x 10^-1 M and 1.00 x 10^-10 M,respectively. Please find the pH and true concentration (M) ofacetic acid, and sodium...
- Q An unidentified covalent molecular compound contains onlycarbon, hydrogen, and oxygen. When 5.00 mg of this compound isburned, 11.61 mg of CO2 and 1.27 mg of H2O are produced. Thefreezing point...
- Q Discussion about:Nuclear EnergyThere are different public opinions about using nuclear energyin producing electrical energy. Nuclear reactors are associatedwith harmful nuclear radiation and there is a problem of thestorage of the...
- Q If some NH4Cl is added to an aqueous solution of NH3:A.the pH of the solution will decreaseB.the solution will not have pHC.NH4Cl cannot be added to NH3D.the pH of the...
- Q Consider the titration of a 20.0 mL sample of 0.105 MHC2H3O2 with 0.125 M NaOH.Determine each quantity:a. the initial pHb. the volume of added base required ot reach equivalencepointc. the...
- Q Consider the following reaction and calculate the standard GibbsFree Energy for it.2 NO + O2 --> 2 NO2Given that delta H= -114.1 kJ and delta S= -146.5 kJ. Alsocomment on...
- Q You have been provided a mixture containing four amino acids(Glu, His, Pro and Lys) to be separated by ion-exchangechromatography using a Dowex 50 cation-exchange, prepared in aloading buffer at pH...
- Q An anion-exchange resin can be used instead of thecation-exchange resin in this experiment to separate the threeamino acids in the known mixture. What changes to experimentalprotocol are required to achieve...
- Q I need to find the equivalence weight of a substance with a COOHgroup.I weighed out 0.150 grams of the substance and dissolved it in30 mL ethanol.I titrated with 0.0999 M...
- Q A 1.159 g sample contains only vitamin C (C6H8O6) and sucralose(C12H19Cl3O8). When the sample is dissolved in water to a totalvolume of 34.0 mL, the osmotic pressure of the solution...
- Q Gel filtration chromatography can also be used to determine themolecular mass of proteins. What additional information might thistechnique provide as compared to SDS-PAGE or ESI-MS (under standardconditions) Please Explain in...
- Q How would the 3p orbitals split in an octahedral field? Brieflyjustify your answer.
- Q Today one U.S. farmer produces enough to feed: a. 100 people b.20 people c. 5 people d. 1000 people
- Q Imagine that you are in chemistry lab and need to make 1.00L ofa solution with a pH of 2.40.You have in front of you100 mL of 6.00
- Q Hi I am working on my chemistry homework about acids and basesand I am confused on this question from a lab. We used grape juiceand cranberry juice and we had...
- Q 1) If 22.0 mL of 2.3 M C2H5NH2are titrated with 0.9 M HCl, what is the pH at 13.1 mL?2) If 25.1 mL of 2.2 M CH3COOH are titrated with...
- Q The motor symptoms of Parkinson's disease
- Q 32. Calculate the [H+]of the ammonium hydroxidesolution from a pH of 10.63.mol/L= ?33. Display the ICE table used to calculate your experimental Kbfor ammonium hydroxide based on your values.
- Q A toluene solution is blended with 25% mass of benzene. Thevapor pressure of benzene and toluene at 25'C are 94.2 torr and28.4 torr respectively. (a) Calculate the vapor pressure of...
- Q 7. Chemical reactions are reversible, however enzymes cancatalyze a reaction reversibly or irreversibly. Document each ofthese characteristics through graphic examples
- Q Gold is plated from a solution of Au3+ using aconstant current of 4.86 A for 352 minutes.Calculate the grams of gold plated out ofsolution.
- Q Say you are provided two samples containing an unknownconcentration of calcium. One sample is a liquid and one sample isa solid (ie. calcium tablet). What analytical technique would bemost efficient...
- Q compare the hardness of some metals with polymers
- Q Natural gas consists of 60.0 mole% ethane and 40.0 mole% butane.The gas is stored in a 300 ft^3 tank at a pressure of 1500 psig,and a temperature of 220 F...
- Q 1) Compare the solubility in water of similar size compoundslike pentane, 1-propanol, and propanone. Which functional group(s)allow the compound to be soluble in water: alcohols, alkanes,and/or ketones? What do the...
- Q Propose a reason for why 2,4-DNP or semicarbazone derivativesusually precipitate out of their ethanolic solutions.
- Q At 1 bar, how muchenergy is required to heat 37.0 g of H2O(s) at −18.0 ∘C to H2O(g)at 119.0 ∘C?q=
- Q If a solution containing 39.142 g39.142 g of mercury(II) nitrateis allowed to react completely with a solution containing 10.872g10.872 g of sodium dichromate, how many grams of solid precipitatewill form?precipitate:How...
- Q You add 7.25 g of ice at 0.00 C to 100 g of water at 80.0 C.What is the final temperature of the mixture atthermal equilibrium assuming no heat loss...
- Q 1. In reviewing the Ontario Drinking Water Standards, how doesyour unknown compare with the standard? How much calcium chlorideor distilled water would be needed to be added to make your...
- Q A 25.00 mL aliquot of solution has a concentration of 3.813 x10-5​ M, what is the concentration of the 50.0 mLsolution the aliquot was taken from?
- Q A certain substance X has a normal boiling point of101.5°C and a molar boiling point elevation constantKb = 1.49 °C/m. A solution is preparedby dissolving some urea (NH2)2CO in 200...
- Q Classify these bonds as ionic, polar covalent, or nonpolarcovalent.K-Cl, H-Br, H-H
- Q A reaction: A (aq) + B (aq) <-----> C (aq) has a standardfree energy change of -3.05 kJ/mol at 25 C. What are theconcentrations of A, B, and C at...
- Q Hydrogen peroxide, H2O2H2O2, is used to disinfect contactlenses.2H2O2(aq)→2H2O(l)+O2(g)2H2O2(aq)→2H2O(l)+O2(g)You may want to reference (Page) Section 6.1 while completingthis problem.Part AHow many milliliters of O2(g)O2(g) at 27 ∘C∘C and 5.00 barrbarrcan be...
- Q Calculate the voltage of the following cell at nonstandardconditions:Cu | Cu2+ (0.150 M) || Cu2+ (.0120 M) |CuConvert your final answer to mV.Group of answer choices64.9 mV-32.4 mV-16.2 mV32.4 mV
- Q Given the following information, answer these questions.P4(g) + 5 O2(g) →P4O10(s)ΔGâ°298  = −2748 kJ/mol2 H2(g) +O2(g) → 2 H2O(l)ΔGâ°298  = −474.2kJ/molP4O10(s) + 6H2O(l) → 4H3PO4(l)ΔGâ°298  = −349 kJ/mol(a)Determine the standard...
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