Chemistry question and answers for August 28, 2023
- Q A solution is made by dissolving 0.0607 g of biphenyl (C 12 H10 ) in 350.0 mL of benzene (C 6 H 6 ) . If the vapor pressure ofpure...
- Q Calculate the molar mass of each Compound :GycerolNaClCaClThis is for the lab experiment on Molar Mass and freezing point,and these are the results l got.Solution. Freezing point in degreesCH2O. 0Gycerol....
- Q A mixture of propionic and n-butyric acids, which can be assumesto form ideal solutions, is to be separated by distillation adistillate containing 95 mol% propionic acid and a bottoms of...
- Q A [a]ml aliquot of a nitric acid of unknown concentration ispipetted into 125-ml Erlenmeyer flask and 2 drops ofphenolphthalein are added. The [b] ml of sodium hydroxide withconcentration [c]mol/l is...
- Q a 5.00 g sample of TNT (C7H5N2O6) is burned in a bombcalorimeter with a heat capacity of 420 J/degreeC. The calorimetercontained 610 grams od water (4.18J/gdegreeC) and the temperatureof the...
- Q In the qualitative analysis scheme, magnesium and nickelprecipitate from solution upon the addition of sodium hydroxide.Once separated from the remaining cations by filtration ordecanting, the solid mixture is acidified and...
- Q The fluorocarbon compound C2Cl3F3 has a normal boiling point of47.6 ?C. The specific heats of C2Cl3F3(l) andC2Cl3F3(g) are 0.91 J/g?K and 0.67 J/g?K, respectively.The heat of vaporization for the compound...
- Q Draw sodium methoxide and potassium tert-butoxide. How are theydifferent? What products do you expect from reacting each base with2-bromoheptane? With 1-bromoheptane?Explain what makes potassium tert-butoxide more stericallyhindered than sodium methoxide...
- Q When the temperature becomes sufficiently high, water vaporstarts to decompose into hydrogen gas and oxygen gas according to2H2O(g) A 2H2(g) + O2(g) Using the following data, and assumingthat 6CP is...
- Q Find the pH of each of the following mixtures of acids.7.0×10−2 molL−1 in HNO3HNO3 and 0.185 molL−1 inHC7H5O21.5×10−2 molL−1 in HBrHBr and 2.0×10−2molL−1 in HClO49.0×10−2 molL−1 in HFHF and 0.230...
- Q 1- A 30.00 mL wine sample is titrated with a1.10×10-1M solution of sodium hydroxide. The equivalencepoint is determined to be 34.705 mL. What is the acidity of thewine expressed as...
- Q What is the theoretical yield in a reaction using 0.50g ofN-tert-butoxycarbonyl-L-alanine, 0.63g methyl-L-phenylalaninatehydrochlroide, 0.4mL isobutyl chloroformate, and 0.3mLN-methylmorpholine to yield methylN-tert-butoxycarbonyl-alanyl-phenylalaninate (Boc-Ala-Phe-OMe)?
- Q (1) Deduce the expressions relating pE to pH, theconcentration of sulfate ion, and the partial pressure of hydrogensulfide gas, given that for the half-reaction, pE° = —3.50 V whenthe pH...
- Q The Kf for the formation ofCo(NH3)62+ is 7.70 ×104.The Kf for the formation ofCo(en)32+ is 8.70 × 1013.Suppose a 500.0 mL solution contains 1.300 millimoles ofCo(NO3)2, 100.0 millimoles of NH3,and...
- Q Using the stock solution provided (7% NaCl) and water, preparethe following solutions: i) 1 mL of NaCl solution with anosmolarity of 50 mOsM ii) 1 mL of NaCl solution with...
- Q PART A-Ethylamine, an organic amine, C2H5NH2, a weak base withKb of 8.3×10−5, reacts with water to form its conjugateacid, C2H5NH+3.1) Write the equation of dissociation for ethylamine.Express your answer as...
- Q Enter your answer in the provided box.Determine the pH of(a) a 0.15 M NH3 solution.(b) a solution that is 0.15 M NH3 and 0.40 M NH4Cl.Kb for NH3 is 1.8...
- Q Why naphthalene is less aromatic than benzene?** Please give a detailed explanation for this answer. thankyou!
- Q NOTE:If more than one bond angle is possible, separate each with aspace.For example, trigonal bipyramid geometry can lead to 3 differentbond angles.Octahedral geometry can lead to 2.A. What is the...
- Q In the lab, a 2.00 x 10-4 M FeSCN2+ stock solution will beprovided. Calculate the volume of stock solution (in mL) requiredto prepare a 10.00 mL 1.50 x 10-4 M...
- Q A.Calculate the enthalpy change, ΔH, for the process inwhich 49.3 g of water is converted from liquid at 18.5 ∘C to vaporat 25.0 ∘C .For water, ΔHvap = 44.0 kJ/mol...
- Q Explain how alloys based on the base material titanium andnickel can be cured.What curing mechanisms can be used and what are the mostimportant mechanism (creating the most stretch limit increase)...
- Q Part A: A calorimeter contains 18.0 mL of water at 13.5∘C. When2.30 g of X (a substance with a molar mass of 69.0 g/mol) is added,it dissolves via the reaction...
- Q Complete and balance the following equations for gass-evolutionreactions.(NH4)2SO4 (aq) + KOH (aq) ------>Express your answer as a chemical equation. Identify all of thephases in your answer please.
- Q Write the balanced chemical equation for each of thesereactions. Include phases.1) When aqueous sodium hydroxide is added to a solutioncontaining lead(II) nitrate, a solid precipitate forms.2) However, when additional aqueous...
- Q Aqueous sulfuric acid H2SO4 reacts withsolid sodium hydroxide NaOH to produce aqueous sodium sulfateNa2SO4 and liquid water H2O. If6.41gof sodium sulfate is produced from the reaction of 7.8g ofsulfuric acid...
- Q Determine the pH of each of the following solutions. Part A 0.17M KCHO 2 Part B 0.24 M CH 3 NH 3 I Part C 0.16 M KI
- Q An alloy is composed of elements A (78%) and B (12%) by weight.The density of the alloy is 1.95 g/cm3. The propertiesof these elements are shown below:ElementGram Atomic Weightσa (barns)σs...
- Q You mix 50.0 mL of a weak monoprotic acid with 50.0 mL of NaOHsolution in a coffee cup calorimeter. Both solutions (and thecalorimeter) were initially at 22.0C. The finaltemperature of...
- Q Describe a method that can be used to separate each of thefollowing mixtures of metal ions.A. Ag+, Pb2+B. Mn2+, Fe3+C. Ni2+, Al3+D. Cu2+, Ni2+
- Q calculate Ecell foreach of the following cells.Al(s)|Al3+( 0.20M )||Fe2+( 0.90M)|Fe(s)Ag(s)|Ag+( 0.38M )||Cl-( 0.094M)|Cl2(g, 0.60atm )|Pt(s)
- Q A 33.153 mg sample of a chemical known to contain only carbon,hydrogen, sulfur, and oxygen is put into a combustion analysisapparatus, yielding 59.060 mg of carbon dioxide and 24.176 mg...
- Q The pKa of formic acid was measured by titrating a 1.00 mMsolution of formic acid with NaOH in the presence of variedconcentrations of NaCl. The results are as listed:NaCl (mM)102550100200pKa4.654.584.534.454.40utilize...
- Q A 10.0 mL aliquot of 0.1000 M base B (pKb1= 4.00, pKb2= 9.00)was titrated with 0.1000 M HCl. At what volume is the secondequivalence point?Find the pH at the volume...
- Q What is the standard free energy of the reaction, in kJ, at 298Kfor:1 A (aq) + 1 B (aq) <--> 2 C (aq) + 2 D (aq)if   ΔH° (A)= -3.4134...
- Q a) The antacid component of Tumsr is calcium carbonate. AssumeTumsr is 40.0 percent CaCO3 by mass. If we have 400. mg of Tumsrhow many ml of 0.100 M HCl can...
- Q Forinorganic chemistryWhat is the correct name of the following :1- [Ni(Co)4]2- [Co(NH3)6] ^2+3- [ Co(NH3)3 (H2O)2 Cl] Br24- Na3 [ Co(NO2)6 ]
- Q i need to recrystallize 1,4-dichlorobenzene (startedwith 1:1 mix of 1,4-dichlorobenzene and 4-aminobenzoate thendissolved in diethyl ether and separated by adding HCl). thesolvents I have available are 99% ethanol, methanol, water,...
- Q A mitochondrial membrane complex consisting of ATP synthase,adenine nucleotide translocase (ATP-ADP translocase), and phosphatetranslocase functions in oxidative phosphorylation. Adeninenucleotide translocase, an antiporter located in the innermitochondrial membrane, moves ADP into...
- Q At 20oC, a saturated solution of silver acetate,AgCH3CO2, contains 1.0 g of the compounddissolved in 100. mL of solution. Calculate Ksp forsilver acetate (ignoring hydrolysis)
- Q Indicate in which solvent the electrostatic force betweenoppositely charged ions would be the strongest, given the sameseparation distance, r, for the ions. The dielectric constants ofthe solvents are: water (80.4),...
- Q If you place one Excedrin tablet in a 250 milliliter volumetricflask what will be the concentration of each active ingredient? Howwould you prepare a solution that contained the active ingredientsin...
- Q Following the grinding of 1.526 g of cereal, extraction ofriboflavin is performed as described in the lab manual, using 40.0mL of water and 0.25 mL of glacial acetic acid, followed...
- Q The compounds listed here are often found in many naturalflavors and scents. Calculate the empirical formula for eachcompound.ethyl butyrate (pineapple oil): C , 62.04% ; H , 10.41% ; O...
- Q 1.) For the chemical reaction 2 Al + 3 H 2 SO 4 ⟶ 3 H 2 + Al 2 (SO 4 ) 3 what mass of hydrogen is produced...
- Q Hello,I was wondering what are other methods to perform a limoneneextractions from orange peels and mint leaves rather than the steamand soxhlet extractions? thank you
- Q Discuss the way in which the addition of a polymer can modify thestability of a charge stabilized colloidal dispersion?
- Q The most important commercial process for generating hydrogengas is the water-gas shift reaction: CH4(g) + H2O(g) → CO(g) +3H2(g)a) Use tabulated thermodynamic data to find ΔG° for thisreaction at the...
- Q a) Definition of terms.Please briefly give the meaning of eachof the following terms:1. colligative property 2. vapor pressure 3. semi-permeablemembrane 4. osmosis 5. dialysis
- Q Explain in detail the experimental procedure you would use tofind heat of solution when sodium chloride is dissolved into water.(Answer in detail.)
- Q How to calculate unreacted concentration of A at 2hr when rate =k[A]1[B]1 (first order both A and B) and rate= k[A]0[B]0 (zero order both A and B) ?A + B...
- Q A compound, XF4, is 52.44% X by mass. What is the moleculargeometry of XF4?A) tetrahedral B) square planar C) square pyramidal D) see-sawE) none of the abovePlease explain to me...
- Q Revised Question: How can I obtain molarities of the finalsolutions with this information that I was told to record in Chem 1Lab? It asks for a molarity of the final...
- Q The density of balsa wood is 18.9 pounds per cubic ft. What isthe weight, in kg, of a piece of balsa wood 2.0 inches by 4.0inches by 10.0 inches?
- Q Consider the evaporation of methanol at 25.0 ?C :CH3OH(l)?CH3OH(g) .Why methanol spontaneously evaporates in open air at 25.0 ?C :Methanol evaporates at room temperature because there is anequilibrium between the...
- Q If the pH of a 2.54-cm rainfall over 3700 km2 is 3.20, how manykilograms of sulfuric acid, H2SO4, are present, assuming that it isthe only acid contributing to the pH?...
- Q Explain in detail the experimental procedure you would use fordetermining the concentration of acetic acid in an aged winesample. ( Answer in detail)
- Q The total of all carbonate species in lake water is 0.001 M, andthe lake pH is 8.Calculate the concentration of each of the individual carbonatespecies.
- Q In the determination of the solubility for copper (II) iodate,what common ion of the same concentration (for example, 0.010 MCu2+ or 0.010 M IO3-) would have a greater effect on...
- Q 15). Classify each of these substances as an element, acompound, or a mixture.a). A sample of “laughing gas†(dinitrogen monoxide, also callednitrous oxide)b). Steam coming from a pan of boiling...
- Q Which carbohydrate is converted by the human body to glucose byconversion of a carbonyl to an enol, then back to a carbonyl?
- Q Every weak acid has the following unique characteristic(s):a. at the 50% titration point the pH = pKab. the best buffering occurs +/- one pH unit of the pKac. the change...
- Q What is the pH of the titration solution when 25.0 mL of .200 Maqueous formic acid, HCO2H, is titrated with 50.0 mL of0.100 M aqueous potassium hydroxide, KOH? The Ka...
- Q How long does it take to deposit a coating of gold 1.00 um thickon a disk-shaped medallion 4.00cm in diameter and 2.00mm thick atconstant current of 86A? The density of...
- Q PT1. Oxygen and sulfur have similar chemical properties due tohaving six valence electrons.  Both form molecules withtwo hydrogen atoms.  Surprisingly, water (H2O)is a liquid, yet H2S is a gas, even though sulfur...
- Q 1. To identify a diatomic gas (X2 ), a researcher carried outthe following experiment: She weighed an empty 4.8-L bulb, thenfilled it with the gas at 1.60 atm and 29.0...
- Q In a constant‑pressure calorimeter, 55.0 mL of 0.820 M H 2 SO 4was added to 55.0 mL of 0.360 M NaOH . The reaction caused thetemperature of the solution to...
- Q The spacing between absorption lines in the far infraredspectrum of H35Cl is 6.350 x 1011Hz. Assumingthe Rigid Rotor Model, calculate the values of the momentof inertia and the bond length...
- Q Just as pH is the negative logarithm of [H3O+], pKa is thenegative logarithm of Ka,pKa=−logKaThe Henderson-Hasselbalch equation is used to calculate the pH ofbuffer solutions:pH=pKa+log[base][acid]Notice that the pH of a...
- Q The heat of fusion of ice is 6.00 kJ/mol. Find thenumber of photons of wavelength = 6.27 10-6 m that must be absorbedto melt 3.00 g of ice.
- Q Given the molality of isoborneol is 0.701 mol/kg, what is thepercent by mass of camphor in the product?
- Q what is the pH of a solution that mixes 30.00 mL of 0.010 MCh3oh with 30.00 mL 0.00750 M Nach3co2?
- Q The triple point of ammonia is at 196.2 K and 49.42 torr. Themolar enthalpy change of vaporization is equal to 24.65 kJmol-1 at this temperature.a. Find the normal boiling temperature...
- Q Howdoes molecular shape and structure give rise to physicalproperties. (e.g, phase, viscosity, boiling point, etc.) of abustance.
- Q 1. Which of the following alkyl halides would not be suitable tomake a Wittig reagent1-bromo-2-methylpropane2-bromobutane2-bromo-2-methylpropane(Bromomethyl)cyclopentane
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