Chemistry question and answers for August 01, 2023
- Q Explain causes leading to the plastic straps on a lawn chairseat, break after it has been left in sunlight for a long period oftime. What types of additive can be...
- Q I am designing a mass spectrometer and the last task asks tofigure out a certain compound based on the ions the spectrometerhas found. It gives an ion ratio of 108:218:432:540...
- Q You did a reaction and it resulted in the following mixture ofcompounds:(Benzoic ring, benzoic ring with OH, Benzoic ring with COOH)What would you do to isolate and then purify benzoic...
- Q what is the pH of a solution following the combination of 245.0mL of a 4.00*10^-3 M NaOH solution with 255.0 mL of a 2.33*10^-3 MH2SO4 solution?
- Q 100 moles of ethane (C2H6) are burned with50% excess air. The percentage conversion of the ethane is 90%; ofthe ethane burned, 25% reacts to form CO and the balance reacts...
- Q If the Ka of a monoprotic weak acid is 8.2
- Q One turn of the CAC only produces one ATP (or GTP).Explain how most of the energy of the four oxidation steps in theCAC is conserved?Please help explain and where could...
- Q Calculate the concentrations of all species in a 1.49 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. [Na+]= [SO3^2-]=[HSO3^-]=...
- Q PART B ONLY<The Ideal Gas Law and Stoichiometry The industrial production ofnitric acid (HNO3) is a multistep process. The first step is theoxidation of ammonia (NH3) over a catalyst with...
- Q Define ΔGO, ΔGO’, ΔG, and ΔG‡
- Q five thousand kilograms of coal/h is combusted with 3000 kg molof air/h. assume the following reaction:C+O -> CO22H+ 1/2 O2-> H2OS+O2-> SO2C+1/2 O2->COthe ultimate analysis of coal reveals it contains...
- Q under a certain set of conditions the solubility of Ag2CO3 is3.5x10^-2 g/L. what is the ksp?
- Q Find the pH during the titration of 20.00 mL of 0.1000 Mbutanoic acid, CH3CH2CH2COOH (Ka = 1.54 × 10−5), with 0.1000 M NaOHsolution after the following additions of titrant. (and...
- Q Use orbitals to explain why bond rotation is possible around thesingle Câ€C bonds in this molecule but not the double C=C bond.Note: To answer this question you may need to...
- Q In an experiment similar to this one, and done very carefully sothat the yield was essentially 100%, 0.05 g of iron reacted withhydrochloric acid to give 0.145 g of a...
- Q A solution contains: silver, lead (II), bismuth (III), antimony(III), nickel (II), and zinc. prepare a flow chart to show how youwould separate and identify the six ions in this solution.
- Q Describe how a fluoride selective ion electrode measures thefluoride ion concentration and explain why the potential approaches0 at high concentrations
- Q Suppose that an 85.0gram laboratory animal ingested 10.0mg of asubstance that contained 2.50% by mass Pu-239, an alpha emitterwith a half-life of 24,110 years.1) What is the animal's initial radiation...
- Q Dry ice is solid carbon dioxide. Instead of melting, solidcarbon dioxide sublimes according to the following equation:CO2(s)→CO2(g). When dry ice is added to warmwater, heat from the water causes the...
- Q Ka for Benzoic acid (a monoprotic acid) isKa = 6.5*10-5. Calculate the pH afteraddition of 23.0, 35.0, 46.0, and 49.0 mL of 0.100M NaOH to 46.0 mLof 0.100M Benzoic acid
- Q The automobile fuel called E85 consists of 85% ethanol and 15%gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs),which can use gasoline, ethanol, or a mix as fuels. Assume...
- Q Two sets of measurements of ethanol concentration in a sample ofvodka were made using the same instrument, but on two differentdays.On the first day, a standard deviation of s1= 9...
- Q 25.00 mL 0.100 M CH3NH2 is titrated with 0.100 M HCl. Calculatethe pH of this the titration solution after the addition of a) 12.5mL and b) 25.00 mL of the...
- Q Specify which of the following statements regarding dehydrationlab (dehydration of 2-methylcyclohexanol) are True or False?a) Both product alkenes will have an equal affinity for the GCcolumn material.b) More 1-methylcyclohexene is...
- Q describe the effects ofmixed inhibitionSubstrate inhibitionProduct inhibitionMechanism based/suicide inhibitorsCovalent intermediatesPing Pong MechanismsBurst KineticsAllosteric Inhibitors
- Q A solution is made by dissolving 0.717 mol of nonelectrolytesolute in 817 g of benzene. Calculate the freezing point, Tf, andboiling point, Tb, of the solution.
- Q A 0.2000M pyridine (Kb=1.7*10^-9) solution with initial volume10.000ml is titrated with 2.500*10^-1 M HCL. what is the pH afterthe addition of :a.) 2.00ml of HCL solutionb.) 6.00ml of HCL solutionc.)8.00ml...
- Q Calculate the percentage change in the equilibrium constant Kxof the reaction H2CO(g) to CO(g) + H2(g) when the total pressure isincreased from 1.0 bar to 2.0 bar at constant temperature
- Q The equilibrium constant Kc for the decomposition of phosgene,COCl2, is 4.63 × 10−3 at 527°C: COCl2(g) ⇆ CO(g) + Cl2(g) Calculatethe equilibrium partial pressure of all the components, startingwith pure...
- Q You probably heard about deep-sea diving with suits in which thedivers breath fluids. The movie \"The Abyss\" portrays itwonderfully. The diver is put into a diving suit which is filledwith...
- Q Calculations Involving a Limiting ReactantQuestion 16.This question has multiple parts. Work all the parts toget the most points.a. \"Smelling salts,\" which are used to revive someone who hasfainted, typically contain...
- Q Describe the way(s) in which a homotropic allosteric effectorcould affect a substrate activity curve.
- Q 1-\Naturally occurring copper exists in two isotopic forms:63Cu and65Cu. The atomic mass of copper is63.55 amu. What is the approximate natural abundance of63Cu?​Select one:a.​63%b.​90%c.​70%d.​30%e.​50%1-\The molar mass of the compound formed...
- Q In the reaction:Fe^3+ + SCN^− ⇌ [Fe(NCS)]2+The initial concentration of Fe^3+ was 0.109 and the initialconcentration of SCN^− was 0.105. After equilibrium wasestablished, the concentration of the complex was 0.09....
- Q What is the pH at the equivalence point in the titration of a23.2 mL sample of a 0.376 M aqueous acetic acid solution with a0.432 M aqueous barium hydroxide solution?...
- Q Hemoglobin and Myoglobin, HOW is oxygen binding regulated? whatother mechanisms control oxygen binding in oxygenated vsdeoxygenated tissues ( lung v. exercising muscles)? Â
- Q Why are carboxylic acids, ketones and esters suitable compoundsfor analysis by gas chromatography-mass spectrometry (GCMS)
- Q Using a 0.20 M phosphate buffer with a pH of 6.0, youadd 0.70 mL of 0.52 M HCl to 58 mL of the buffer. What isthe new pH of the...
- Q need summary on aspects of covalent bonds, violationsof the Octet rules and molecular shapes.
- Q This is a two part solution. Please include step by stepsolution that way I can study from this. Thank you.Equation (24.2): 3I^-(aq) + H2O2(aq) + 2H3O^+(aq) --->I3^-(aq) + 4H2O(l)Equation (24.11):...
- Q What are some similarities between transition metal elements andrepresentational metals? (besides both are oxidized bynonmetals)
- Q please answer questions 3&4thanksQ• Identify components of glycoconjugate structures and classifythem based on open and closed forms, conformations and epimericclasses ( CC2)Q2• Draw mechanisms related to the interconversion of anomericforms...
- Q What is the molarity of a sodium hydroxide solution if 25.0 mlof this solution reacts exactly with 22.30 ml of 0.253 M sulfuricacid?Thanks!
- Q Calculate the initcial I^- concentration in a solutioncontaining 3.0 mL of 0.20 M KI, 5.0 mL of 0.15 M (NH4)2S2O8, 5.0 mLof 0.25 M (NH4)SO4, 6.0 mL of 0.10 M...
- Q Explain what would happen if the hexane was added to the top ofthe column immediately after adding the sample. This is forisolation of chlorophyll and carotenoid pigments from spinach
- Q The Ksp of Al(OH)3 is 1.0 x 10-33. What is the solubility ofAl(OH)3 in 0.0010 M Al(NO3)3? Give your answer using scientificnotation and to 2 significant figures (i.e., one decimalplace).
- Q Explain why the solubility of sodium sulfate in waterdecreases with increasing temperature.
- Q 1) A 10.00 ml sample of an aqueous solution of calcium hydroxideis neutralized by 20.00 ml of 0.02000 M NHO3(aq). Whatis the molarity of the calcium hydroxide solution? Enter only...
- Q A molecular compound contains 92.3% carbon and 7.7% hydrogen bymass. What is the empirical formula of this compound? If 0.592 molof the compound weighs 30.78g, what is its molecular formula?
- Q Consider the insoluble compound copper(II) hydroxide , Cu(OH)2 .The copper(II) ion also forms a complex with ammonia . Write abalanced net ionic equation to show why the solubility of Cu(OH)2(s)...
- Q I did an organic chemistry lab where I purified a sample ofcrude biphenyl. The following questions are in regard to thelab.a. More polar solvents move molecules more rapidly than lesspolar...
- Q 2. At 500 °C, cyclopropane (C3H6) rearranges to propene(CH3CH=CH2):   C3H6 (g) ------> CH3CH=CH2(g)The reaction is first order and the rate constant is 6.7 x 10-4s-1. (a) What is the rate...
- Q The rate of reduction of [Co(NH3)5(OH2)]3 by Cr(II) is sevenorders of magnitude slower than reduction of its conjugate base,[Co(NH3)5(OH)]2, by Cr(II). For the corresponding reductions with[Ru(NH3)6]2, the two differ by...
- Q What shape heating and cooling curves suppose tohave?
- Q You need to make a benzoic acid-based buffer that has a ph of5.10. The volume should be 500ml. What masses of the acid and itsconjugate base should you use? (Hint:...
- Q Derive a balanced equation for the reaction occurring in thecell:Fe(s)|Fe2+(aq)||Fe3+(aq),Fe2+(aq)|Pt(s)a.) If E?cell = 1.21 V, calculate ?G? for thereaction.b.) If E?cell=1.21V, calculate the equilibrium constantfor the reaction.c.) Use the Nernst...
- Q 1) The Ka of a monoprotic weakacid is 2.47
- Q For a weak acid, HA,1) write the ionization reactionin water2) write the expressio of its acid ionation constant, Ka3)If Ka is 1.0 x 10^-6, calculate the pH of a 0.200-M...
- Q Calculate the activity of 30 g of radium-226 in Bq and mCi. (The half-life of radium-226 is 1600yeras.) Ci ( = 3.7times10^10Bq)
- Q Show using the C4v point group character table the orthogonalityof any two irreducible representations.Using the same point group demonstrate the property of thecharacter table that two irreducible representations can be...
- Q URGENT!! Solid carbon can react with gaseous water to formcarbon monoxide gas and hydrogen gas. The equilibrium constant forthe reaction at 700.0 K is Kp=1.60×10−3. Part A If a 1.55-Lreaction...
- Q Q-how many sig figs are ina-100cmb-372992 mlQ- find the number of photon when wavelengrh ia 337nm energyis 3.83m.J
- Q Isthe visual appearance of an image a reliable indicator ofoverexposure? Why/why not ? How could this negatively affect thepatient?-How images suffer from a loss of diagnostic quality due toexcessive exposure?...
- Q At 1 atm, how much energy is required to heat 53.0 g ofH2O(s) at –10.0 °C to H2O(g) at 139.0 °C?
- Q Three major spectroscopic methods for elementalanalysis atoms are Atomic Absorption Spectroscopy, Atomic EmissionSpectroscopy, and Atomic Mass Spectroscopy. Briefly describe thephysics behind each of the three methods.
- Q one mole of ice at 0 C is turned completely into steam byheating under 1 atm pressure. calculate the entropy change in thesystem with specific heat capacity and enthalpy/heatvalues.assuming they...
- Q Abeer was placed in the freezer for 3 hours. After it was taken out,the person holding the beer taps the beer against the counter top.The beer rapidly froze. Why did...
- Q A) A 193.0 L sample of gas of the upper atmosphere at a pressureof 4.8 torr is compressed into a 256.0 mL container at the sametemperature. What is the new...
- Q Question: A reaction A + B <==> C has a standardfree-...SaveA reactionA + B <==> Chas a standard free-energy change of -3.22 kj/mol at 25oCWhat are the concentrations of A,...
- Q [Problem 15-5, p.679 in Henry and Heinke.] Some of the importantcharacteristics of each of the reactors at the Pickering NuclearGenerating Station are as follows:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Thermal output: 1744 MWÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Number of fuel channels:...
- Q ALL WITH EXPLANATIONS please :)12. Consider the following reaction:2SO2(g)  +  O2(g)  ⇄  2SO3(g)   +E            Which of the following will not shift the equilibrium to theright?            A.        Addingmore O2            B.        Addinga catalyst            C.        Increasingthe pressure            D.        Lowingthe temperature13.         Considerthe following equilibrium system: CaCO3(s)  ⇄CaO(s) +  CO2(g)            Whichone of the...
- Q Calculate the pH of a 25 mg/L solution of hydrofluroic acid.HF = H+ + F- Ka=10^-3.2
- Q Be sure to answer all parts.Calculate the pH during the titration of 40.00 mL of 0.1000M HCl with 0.1000 M NaOH solution after thefollowing additions of base:(a) 20.00 mLpH =(b)...
- Q Recycling one aluminum can save enough energy to charge theaverage smartphone for 14 hours?Recycling one aluminum can save enough energy to charge a TV for3 hours?Recycling one aluminum can give...
- Q 12. A 15.7-g sample of sodium carbonate isadded to a solution of acetic acid weighing 19.4g. The two substances react, releasing carbon dioxide gas to theatmosphere. After reaction, the contents...
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