Chemistry question and answers for July 19, 2023
- Q At which pH would the net electric charge of tyrosine be zero,given that its -COOH group has a pKa of 2.20, its –NH3+ group has apKa of 9.11, and its...
- Q A 300.0 mL buffer solution is 0.230 M in acetic acid and 0.230 Min sodium acetate.Part A: What is the initial pH of this solution?Part B: What is the pH...
- Q Calculate the amount of heat required to convert155 g of ice at -10oC to steam at110oC? (Hint:Hfusion= 80cal/g and Hvaporization =540cal/g - show your work on the left, final answer...
- Q The vapor pressure of diethyl ether (ether) is463.57 mm Hg at 25°C.How many grams of testosterone,C19H28O2, anonvolatile, nonelectrolyte (MW = 288.4 g/mol),must be added to 192.8 grams of diethylether to...
- Q 4. When perturbing the equilibrium with heating and cooling, howmany times do you think the equilibrium can be shifted before itstops working? Why? How about modification of the equilibriumthrough changes...
- Q 2(a). Describe how adding a solution of KOH to the originalsulfide precipitate results in the separation of Sn4+ ion from theother Group II cations.2(b). Why wouldn’t a weak base, such...
- Q The dibasic compound B (pKb1 5.00, pKb2 9.00) was titrated with0.5 M HCl. The initial solution of B was 0.0500 M and had a volumeof 50.0 mL. Find the pH...
- Q Answer the questions completely with complete calculations.1. Balance the following equation & fill in the state of thechemicals.a. Fe2 (SO4)3 (aq) + NH3 (aq) + H2O (l) --> Fe (OH)3...
- Q A 5.193 gram sample of an organic compoundcontaining C, H and O is analyzed by combustion analysis and9.255 grams of CO2 and3.790grams of H2O are produced.In a separate experiment, the...
- Q Calculate the change in pH when 8.00 mL of 0.100 M HCl(aq) isadded to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq)and 0.100 M in NH4Cl(aq)....
- Q Part A: What mass of water is produced from the completecombustion of 5.90×10−3 g of methane?Part B: What mass of oxygen is needed for the completecombustion of 5.90×10−3 g of...
- Q 1. Does the pH increase, decrease or remain the same on theaddition of the of the following?a.) LiF to an HF solution b.)KI to an HI solution c.)NH4Cl to anNH3...
- Q To prepare 0.250 L of 0.100 M aqueous NaCl (58.4g/mol), one may
- Q 1. a.) What is the pH of a solution created by combining 1.27mole of HOBr and 0.43 mole NaOH in a 1.00L solution? Ka HOBr = 2.5x 10-9b.)What is the...
- Q A 340.0 −mL buffer solution is 0.140 M in HF and 0.140 M in NaF.What mass of NaOH could this buffer neutralize before thepH rises above 4.00? And, If the...
- Q Intro to the problem:To understand how buffers use reserves of conjugate acid andconjugate base to counteract the effects of acid or base additionon pH.A buffer is a mixture of a...
- Q At a certain temperature, 0.920 mol of SO3 is placed in a 4.00-Lcontainer. 2SO3(g) <===>2SO2(g) + O2(g) At equilibrium, 0.130mol of O2 is present. Calculate Kc.
- Q 13.Explain each term in the Van Deempter Equation (Below). Whatmajor advantage is gained through open tubular GC in reference tothis equation?
- Q For each strong base solution, determine [H3O+], [OH−], pH, andpOH.Part A 8.86×10−3 M LiOHPart B 8.86×10−3 M LiOHPart C 1.14×10−2 M Ba(OH)2Part D 1.14×10−2 M Ba(OH)2Part E 2.1×10−4 M KOHPart...
- Q Each step in the process below has a 70.0% yield.CH4+4Cl2-->CCl4+4HClCCl4+2HF-->CCl2F2+2HClThe CCl4 formed in the first step is used as a reactant in thesecond step. If 7.00 mol of CH4 reacts,...
- Q An industrial chemist studying bleaching and sterilizingprepares several hypochlorite buffers.(a) Find the pH of 0.070 M HClO and 0.070 MNaClO.(b) Find the pH of 0.070 M HClO and 0.105 MNaClO.(c)...
- Q what are the trends of electronegativity, atomicradii, and ionic radii on the peridot table?
- Q If 11.2 kilograms of Al2O3(s), 52.4 kilograms of NaOH(l), and52.4 kilograms of HF(g) react completely, how many kilograms ofcryolite will be produced?What is the total mass of the excessreactants left...
- Q When calcium carbonate is added to hydrochloric acid, calciumchloride, carbon dioxide, and water are produced. How many grams ofcalcium chloride will be produced when 25.0 g of calcium carbonateare combined...
- Q 3) for one resonance structure of a nitrate(NO3-)provide the:a) Lewis structureb) formal charge on each atomc)name of the electro pair(electron domain)geometryd) hybridization of the central atome)name of the molecular geometry...
- Q What mass of HCl gas must be added to 1.00 L of a buffersolution that contains [aceticacid]=2.0M and [acetate]=1.0M inorder to produce a solution with pH = 3.73?
- Q Cd2+ and Pb2+ ions in a polluted water sample are measured bycomplexation. In a first titration, 50.00 mL of water at pH 10 istitrated by 40.09 mL of 0.004870 M...
- Q 1:A piece of solid magnesium is reacted with hydrochloric acid toform hydrogen gas:Mg(s) + 2HCl(aq) Ã MgCl2(aq) + H2(g)What volume of hydrogen gas (in mL) is collected over water at25...
- Q A 1000.-mL solution of hydrochloric acid has a pH of 1.6.Calculate the mass (g) of HCl dissolved in the solution.
- Q You are attempting a recrystallization of the world’s onlysample of charliebionic acid with a small amount of an unknownimpurity.  The acid is not soluble at all in water. Theacid is...
- Q For each of the following strong base solutions, determine[OH−],[H3O+], pH, andpOH.Part A0.20 M NaOHExpress your answer using two significant figures. Enter youranswers numerically separated by commas.[OH−], [H3O+]=______________MPart BExpress your answer...
- Q compared to a heavier liquid fuel like gasoline, why mightethylene be a more desirable source? (Think about thermodynamicfeatures, such as ideality, as well as other factors such asweight, cost, storage,...
- Q When doing Paper Chromatography,1.What would you expect to see if the paper had been touched byfingers after developing with solvent, but before staining withninhydrin?2.Why does the filter paper need to...
- Q Inphysical chemistry I want to answer thisIn your own words explain the following terms: 1) Born-oppenheimer Approximation , 2) molecular orbital , 3) overlapintegral , 4) coulomb integral and 5)...
- Q Calculate the pH and concentration of all species of malonicacid (C3H4O4) in each of the follwing solutions.K1=1.42*10^-3, K2=2.01*10^-60.100 M NaC3H3O4 solution0.100 M Na2C3H2O4 solution
- Q A) For the reaction: 3A(g)+2B(g)⇌C(g) Kc = 63.4 ata temperature of 377 ∘C .Calculate the value ofKp. Expressyour answer numerically.B) For the reaction X(g)+3Y(g)⇌3Z(g) Kp =2.91×10−2 at atemperature of 229...
- Q 1000 mol/min of a mixture of 90 mol% air and 10 mol% HCl entersan absorber column and is contacted with a stream of pure waterentering the column at the rate...
- Q Compounds A and B have the following vapor pressures:150oF: PA=600mmHgPB=500mmHg200oF:PA=1000mmHgPB=950mmHgAssume that these compounds formideal solution, calculate the vapor mole fraction of A and thetotal pressure VLE when the liquid mole...
- Q Q1)What is the common ion in a solution that is saturated withthe salts Na3PO4, Na2SO4, and AgCl?Ag+, Na+, po4^3-, so4^2-, cl-Q2What is the pH of a buffer made by adding...
- Q Calculate the pH of a 0.15 M lithium acetate (ka = 1.8 x 10 -5).
- Q Buffer preparation is a necessary part of working with anyliving cell culture. Buffers are most commonly prepared by startingwith a weak acid, HA, or weak base, A-, and adding enough...
- Q In Atomic Absorption Spectrophotometry (AAS) Lab, we ask to makea standard to determine the linear range of the Mgcalibration.\"First make up a 100.0 ppm Mg solution. Then from the 100...
- Q Assuming standard conditions, answer the following questions.(Use the table of Standard Reduction Potentials for commonHalf-reactions from your text. If hydrogen is one of the reagents,assume acidic solution.)1) Is Cr3+(aq) capable...
- Q Q1Ksp(CaF2)=3.9*10-11. What is the concentration of [F-] inequilibrium with solid CaF2?0.00043m, 0.00027m, 0.00054m, 0.0021mQ2The Ksp of silver acetate (Ag(H3C2O2)) is 2.0*10-3. What isthe concentration of Ag+ in equilibrium with solid...
- Q Discuss the chemical reactions that occurred between glucose,fructose, xylose and sucrose and the 4 reagents(Benedict, Bial,Seilwanoff and Molisch) which have resulted in color changes.Describe how it occurs in full using...
- Q Given a diprotic acid, H2A, with two ionization constants of Ka1= 4.08× 10–4 and Ka2 = 2.89× 10–12, calculate the pH and molarconcentrations of H2A, HA–, and A2– for each...
- Q Consider the titration of a 22.0 −mL sample of 0.100 M HC2H3O2with 0.130 M NaOH. Determine each quantity: (For acetic acid,HC2H3O2, Ka = 1.8 × 10^-5)A) The initial pH.B) The...
- Q At 25 °C only 0.0650 mol of the generic salt AB2 is soluble in1.00 L of water. What is the Ksp of the salt at 25 °C?
- Q In a 1.0× 10–2 M solution of CH3NH3Br(aq), identify the relativemolar amounts of these species. List them from Most to Least,please.H2OBr-CH3NH2CH3NH3OH-H3O+HBr
- Q A solution of household bleach contains 5.25% sodiumhypochlorite, NaOCl, by mass. Assuming that the density of bleachis the same as water, calculate the volume of household bleach thatshould be diluted...
- Q Arrange in order of increasing atomic size. (Use the appropriate<, =, or > symbol to separate substances in the list.)(a) the Period 2 elements C, Ne, and O(b) the Group...
- Q how much 5.80 M NaOH must be added to 460.0 mL of a buffer thatis 0.0200 M acetic acid and 0.0250 M sodium acetate to raise the pHto 5.75
- Q A chemical analysis of a surfacewater yields the following data:Ion      Concentration(mg/L)Ca2+ 90Mg2+30Na+72K+ 6Cl- 120SO42- 225HCO3- 165pH 7.5What concentration of Cl- (mg/L) would make the cations andanions balance? Â
- Q A certain weak acid, HA, with a Ka value of 5.61×10−6,is titrated with NaOH.A solution is made by mixing 9.00 mmol (millimoles) of HA and 3.00mmol of the strong base....
- Q The decomposition of n2o5 is a first order reaction. N2o5decomposes to yield no2 and o2.At 48deg C the rate constant for the reaction is 1.2x10^-5s^-1.Calculate the partial pressure of no2...
- Q The equilibrium constant, Kc, for the following reaction is1.05×10-3 at 446 K. PCl5(g) PCl3(g) + Cl2(g) When a sufficientlylarge sample of PCl5(g) is introduced into an evacuated vessel at446 K,...
- Q if mixture is composed of 76.3% c-12 and 23.7% of c-14 what isthe average atomic mass
- Q In the reduction of benzil, three isomers of hydrobenzoinwere produced. Despite the fact that all three isomers wereproduced in the lab, you only isolated the mesoisomer. What happened to the...
- Q Consider the reacton of bromine and chlorine gas to form BrClwhere Kp=1.11X10^-4 at 150K. A reaction mixture initially containsa bromine partial pressure of 755 torr and a chlorine partialpressure of...
- Q 1. For each of the followingreactions, indicate whether you would expect the entropy of thesystem to increase or decrease, and explain why. If you cannot telljust by inspecting the equation,...
- Q B. Which member of the following pairs has the lesser predictedamount of entropy?H2O (l) or H2O (s)PbS (s) or PbF2(s)Fe(s) at 25°C or Fe(s) at 100°C
- Q Part A) Approximately how many mL of 5% BaCl2 solution would berequired to precipitate all the sulfate if we assume that yoursamples are pure Magnesium sulfate? Assume that the density...
- Q Consider the following reaction. 2 A + B −→ P A table of initialrates with initial concentrations of A and B is given below. [A]o(M) [B]o (M) rate M s...
- Q How many moles of KF should be added to 0.50 L of a 0.10 M HFsolution to prepare a buffer with a pH of 2.84?
- Q HX is a weak acid that reacts with water according to thefollowing equation: HX(aq) + H2O(l) H3O1+(aq) + X1-(aq) Ka =3.16e-07 What is the equilibrium concentration of hydronium ion ina...
- Q Oh, no! You just spilled 85.00 mL of 1.500 M sulfuric acid onyour lab bench and need to clean it up immediately! Right next toyou there is a small jar...
- Q Give 2 examples showing how competing equilibrium reactionsaffect one another. ( Le Chatlier's Principle)
- 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 0.320 and at520...
- Q A dilute solution of 0.05120 M was prepared when the labtemperature was 25 oC. On another day the solution wasused when the temperature was 15 oC. What is theconcentration of...
- Q The boron trifluoride molecule is depicted as havingthree single bonds and an electron-deficient central boron atom.Use the concept of formal charge to suggest why a structureinvolving a double bond to...
- Q A.I need to calculate the number of moles Al,S, and O atoms in4.00 moles of Al2(SO4)3b.calculate # of moles of Mg,Cl, and O atoms in 5.10 moles ofMg(Cl4)2c.a sample of...
- Q The following reaction is used to obtain iron from iron ore:Fe2O3(s)+3CO(g) ? 2Fe(s)+3CO2(g)The reaction of 172 g of Fe2O3 with 84.2 g of CO produces 71.8 gof Fe.Calculate the theoretical...
- Q If 0.276 g of cyclohexane was obtained from 0.480 g ofcyclohexanol what is the percent yield of cyclohexane? Show allcalc
- Q For the reaction SO3(g) + NO(g) NO2(g) + SO2(g) Kc was found tobe 0.500 at a certain temperature. A reaction mixture is preparedin which 0.130 mol NO2 and 0.130 mol...
- Q Determine the molar solubility (S) of Ag2CO3 in a bufferedsolution with a pH of 3.255 using the systematic treatment ofequilibrium. Ksp(Ag2CO3) = 8.46 × 10–12; Ka1(H2CO3) = 4.45 × 10–7;Ka2(H2CO3)...
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