Chemistry question and answers for July 22, 2023
- Q 500.0 mL of 0.140 M NaOH is added to 565 mL of 0.250 M weak acid(Ka = 8.39 × 10-5). What is the pH of the resulting buffer?HA(aq)+OH^-(aq)=H2O(l)+ A^-(aq)pH=?
- Q A 500 mL buffer is usually prepared with 46 mM carbonic acid and58 mM sodium bicarbonate. Unfortunately you have run out of thesereagents; on hand you have the following: solid...
- Q The following takes place in a voltaic cell:Zn(s) + Cu2+(1 M) → Cu(s) + Zn2+(1 M).The cell has a voltage of +1.10 V.Choose the answer that best relates toquestions 1-4.(A)...
- Q The odor of a dead fish is attributed to trimethylamine,(CH3)3N, one of a series of compounds of nitrogen, carbon, andhydrogen with a general formula of(CH3)nNH3-n where n = 0-3 (the...
- Q Identify the bonding in each of the following substances asionic or covalent.(a) NaCl (select)ioniccovalent(b) H2 (select)covalentionic(c) CH4 (select)covalentionic(d) SiO2 (select)ioniccovalent
- Q Which of the following amino acids pairs would form thedescribed hydrogen bond at pH 7? Explain your answer?A. His AspB. Tyr HisC. Ser ArgD. Glu ThrA certain protein has a...
- Q What problems can occur if the iodine value of a startingmaterial is too low? And too high ?
- Q One of the main assumptions in protein X-ray crystallography is,that proteins (for that matter all other biological macromoleculesas well) in their crystalline state have folding topologiesidentical to those of the...
- Q Calculate the pH and pOH for the following solutions:a) 0.0450 M NaOHb) 0.160 M Ca(OH)2c) a 1:1 mixture of 0.0125 M HCl and 0.0125 M Ca(OH)2d) a 2:3 mixture of...
- Q (Combustion Analysis)100 m3 of a fuel oil are burned per hour with 20 percent excessair in a steam generator. The fuel oil has a density of 926 kg/m3and the following...
- Q Â 1. A sample of a compound has a mass of 4.86 g and is composed of Silicon and Oxygen. What is the percent composition if 2.27 g of the mass...
- Q (a) How many moles of ammonium ions are in 0.795 g of ammoniumcarbonate?(b) What is the mass, in grams, of 0.0507 mol of iron(III)phosphate?(c) What is the mass, in grams,...
- Q Consider the two Lewis structures given below. Which of thefollowing statements is correct?In a reaction, 1 would function as a Lewis base while 2 wouldfunction as a Lewis acid.2 would...
- Q Who do you figure out alkalinity in chemisty?
- Q Consider the following reaction and its equilibriumconstant:I2(g) + Br2(g) 2 IBr(g) Kc = 1.1 × 102This reaction mixture contains initially 0.41 M I2 and 0.27 MBr2. Calculate the equilibrium concentration...
- Q Distilation questionsWhat is the function of the water in a steam distillation of thespice oil from the ground spices?What determines the distillation temperature of the distillatein a steam distillation and...
- Q Part 1) what is the source of solute movement through thecapillary? Part 2) what drawbacks does this technique have? Part 3)what are the advantages of this technique?
- Q 1) describe isoelectric focusing and isopycnic (density)separation techniques 2) why are these real focusing techniques? 3)how are these gradients established in both cases? d) describe thedifficulties in using each 4)...
- Q You could add solid KCl to the solution to precipitate outAgCl(s). What mass of KCl is needed to precipitate the silver ionsfrom 13.0 mL of 0.180 M AgNO3 solution?
- Q Briefly discuss the main difference between the valence bond andmolecular orbital treatments of electronic states in molecules.Which is a better representation of molecules with all bond lengthsat their equilibrium separation?...
- Q Be sure to answer all parts.Find the pH of the equivalence point and the volume (mL) of0.0707 M KOH needed to reach theequivalence point in the titration of 23.4 mL...
- Q 3. What values of the angular momentum (l) and magnetic (ml)quantum numbers are allowed for a principal quantum number (n) of4? How many orbitals are allowed?
- Q Physical chemistryCould you please search in this topic and use two referencesand send me them with the information that I need.My topic is Morse PotentialI need a historical background of...
- Q Hi! is there someone famiilar with organic chem that could readand edit my paragraph about my lab report results. Im havingtrouble making it flow better, but not make it too...
- Q Calculate the pH for each of the following cases inthe titration of 50.0ml of 0.110M. HCLO with 0.110M KOH. Theionization constant for HCLO= 4.0*10^-8. a) before adding KOH b)after adding...
- Q if you added 3.2652 g of calcium chloride to your diluted sodiumphosphate solution what reaction would occur?
- Q The following mechanism has been proprosed;i.HNO2+H+<--->H2O+NO+ (fast k1)ii. NH4+<-->NH3+H+ (fast k2)iii. NO+ + NH3-->NH3NO+ (slow k3)iv. NH3NO+--> H2O+H++ N2a.Write the net overall equation?b.The NH4+ ion is acting as the _______...
- Q Consider the following reaction:Fe3+(aq)+SCN−(aq)⇌FeSCN2+(aq)A solution is made containing an initial [Fe3+] of1.1×10−3 M and an initial [SCN−] of 8.2×10−4M. At equilibrium, [FeSCN2+]= 1.8×10−4 M .Part ACalculate the value of the...
- Q A 20mLsol'n was composed of .20M NH3 and .25 M NH4Cla)determine the sol'n pH (ka= 5.6 x 10^-10b)determine the pH after 1.00mL of 1.00M HCl was added
- Q Consider the following reaction and associated equilibriumconstant:aA(g)⇌bB(g), Kc =1.5Part AFind the equilibrium concentrations of A and B for a=1and b=1. Assume that the initial concentration of A is 1.0M and...
- Q Theory of enzymes:True or False:___ Enzymes catalyze reactions by increasing the reaction freeenergy___ Enzyme are remarkable for their substrate specificity.___ Enzyme can convert light energy into chemical or mechanicalenergy___ Catalytic...
- Q explain the role of ammonia solution, diazonium salt and halogenlamp in developing of the colorful image formed in dye coupling anddiazo imaging
- Q What is the vapor pressure of eugenol during thedistillation?
- Q A 115.0 −mL sample of a solution that is 2.6×10−3 M in AgNO3 ismixed with a 220.0 −mL sample of a solution that is 0.14 M in NaCN.A complex ion...
- Q Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 205 mL of coffee from 25.0∘C to 62.0 ∘C? Assume that the...
- Q Suppose 20.0 mL of a 0.100 M NH3 solution is titrated with 0.100M HI. Determine the pH of the solution after the addition of thefollowing volumes of titrant.a. 5.00 mLb....
- Q What is the minimum mass of potassium carbonate that must beadded to 100.0 mL of a 0.235 M solution of silver(I) nitrate inorder to form a precipitate?
- Q how are aerobic and anaerobic decomposition, BOD, dissolvedoxygen concentration, and eutropication are related to each otherand what does each term means
- Q Calculating the packing fraction (The percent space occupied byatom) for a hexagonal unit cell requires a bit more trigonometrythan the same calculation for a cubic cell. However, based on yourobservations,...
- Q Calculate the pH at the equivalence point in titrating 0.120 Msolutions of each of the following with 9.0×10−2 MNaOH.Part Ahydrobromic acid (HBr)Part Bchlorous acid (HClO2)Part Cbenzoic acid (C6H5COOH)
- Q Calculate the max # of moles and grams of H2S that can form when143 g aluminum sulfide reacts with 128.8 g water?a) ____mol H2S b) _____g H2S c) ____g excess...
- Q At a certain temperature, this reaction establishes anequilibrium with the given equilibrium constant Kc.3A + 2B -><- 4C kc=1.33x10^27If at this temperature, 2.00 mol of A and 3.80 mol of...
- Q Consider a weak acid-strong base titration in which 25 mL of0.120 M of acetic acid is titrated with 0.120 M of NaOH.a) Calculate the pH of the acetic acid solution...
- Q The Ka of a monoprotic weak acid is 5.55x10-3. what is thepercent ionization of a .182 M solution of this acid
- Q Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) isadded to 100.0 mL of a buffer solution that has a 0.100 Mconcentration of NH3(aq) and a 0.100...
- Q what effect would each of the following errors have on thedetermined concentration of the unknown acid? (would the calculatedvalue be too high, too low, or unchanged? a) the mass of...
- Q DIRECT METHOD EXAMPLE: A buffer was created by mixing 10 mL of a0.10 M hydrofluoric acid solution with 25 mL of a 0.20 M sodiumfluoride solution. What is this solution’s...
- Q Use data from Appendix C to calculate the equilibrium constant,K, and ΔG∘ at 298 K for each of the followingreactions.H2(g)+I2(g)⇌2HI(g)Calculate ΔG∘.Express your answer to four significant figures and include theappropriate...
- Q At 1 atm, how much energy is required to heat 75.0 g of H2O(s)at –10.0 °C to H2O(g) at 137.0 °C?
- Q Chromium (III) oxide, often called chromic oxide, has been usedas green paint pigment, as a catylistin organic synthesis, as apolishing powder, and to make metallic chromium, One way to makechromium...
- Q Part A) A 0.5865-g sample of lactic acid(HC3H5O3) is burned in a calorimeter whose heat capacity is 4.812kJ/°C. The temperature increases from 23.10 °C to 24.95 °C.Calculate the heat of...
- Q A 1.00 liter solution contains 0.39 Mammonia and 0.30 Mammonium nitrate.If 0.15 moles of nitric acid areadded to this system,indicate whether the following statements are TRUE(T) or FALSE (F).(Assume that...
- Q A 1.00 liter solution contains 0.51 M nitrous acid and 0.38 Msodium nitrite. If 25.0 mL of water are added to this system,indicate whether the following statements are TRUE (T)...
- Q Phenol is soluble in NaOH (aq) and not NaHCO3 (aq) while benzoicacid is soluble in both solutions. Explain how a mixture of phenol,benzoic acid, p-nitroaniline and anthracene can be separated...
- Q Write and balance equations for the following acid-baseneutralization reactions.Part ACsOH(aq)+H2SO4(aq)→Express your answer as a chemical equation. Identify all of thephases in your answer.Part BCa(OH)2(aq)+CH3CO2H(aq)→Express your answer as a chemical equation....
- Q What mass of ammonium chloride should be added to 2.55 L of a0.150 M NH3 in order to obtain a buffer with a pH of 9.60?
- Q A mole of air is sampled from the atmosphere when theatmospheric pressure is 765 mmHg, the temperature is 25 C, anrelative humidity is 75%. The sample of air is placed...
- Q how does atomic radius, ionization energt, or electron affinityexplains the solubility of ions?
- Q At a pressure of 907 mbar , what would the height of the mercuryin the column of a mercury barometer?alsoA closed container is filled with oxygen. The pressure in thecontainer...
- Q The products of our reaction (1- and 2-heptene) can formperoxides upon standing in air for a prolonged period of time. Whyis 1-heptene more likely to form peroxides than heptane?
- Q what are some of the possible impurities in the preparation oftetraphenylporphyrin and how does the purification scheme removemost of them in synthesizing tetraphenylporphyrin and cu(TPP)lab.
- Q What does the angle of twist mean in chemical compunds?Specifically BINOL.Where can I find references?
- Q Calculate the pH of a 25.0 mL sample solution of phosphoric acidif its requires 20.5 mL of 0.10 M NaOH to neutralize the solution.The acid dissociation constants are listed in...
- Q Q: A mixture of 0.423 moles of N2 and 5.73 moles ofCO2 has a total pressure of 777 torr. What is thepartial pressure of N2?Please give the details of the...
- Q At 1 atm, how much energy is required to heat 65.0 g of H2O(s)at –18.0 °C to H2O(g) at 161.0 °C?
- Q The osmotic pressure, Î , of a solution of glucose is 34.2 atm .Find the molarity of the solution at 298 K. Express the molarity tothree significant figures and include the...
- Q combustion engine.Discuss the thermodynamics of the Otto cycle for a combustionengine.Why does the efficiency depend on the compression ratio?What is the problem with that? Why is the Otto cycle better...
- Q 1)The Ksp of nickel(II) hydroxide, Ni(OH)2, is 5.84 × 10-16.Calculate the solubility of this compound in g/L.2)The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (ing/L) of CaSO4(s) in...
- Q Reaction 2: 10 mL of 0.1 M CuSO4 and 10 mL of 0.1 M NaOHCalculate the theoretical yield in grams of the product
- Q (a) If the molar solubility ofCd3(AsO4)2 at 25 oC is1.15e-07 mol/L, what is the Ksp at thistemperature?Ksp =Â Â (b) It is found that 6.47e-05 g of Ag3AsO4dissolves per 100 mL of...
- Q 1. You make a solution of 0.464 moles HClO2 and 0.464 molesClO2- dissolved in 1.00 L. What is the minimum number of moles ofKOH would need to be added in...
- Q calculate the amount of energy required to convertsaturated water at 150 kpa to superheated steam at 180 C and at thesame pressure.
- Q Sketch a graph for a titraton of a weak acid(burette) against25cm^3 of strong base (conical flask). Assume that both have aconcentration of 0.5M. Label axis please!
- Q Calculate the quantity of energy, in joules, required to raisethe temperature of 486 g tin from room temperature, 25.0 °C, to itsmelting point, 231.9 °C, and then melt the tin...
- Q a) Methyl Heptenone contains the elements C, H, and O and has alemon-like odor. The complete combustion of 192 mg of MethylHeptenone produces 528 mg of CO2 and 216 mg...
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