Chemistry question and answers for July 02, 2023
- Q a solution is prepared by mixing equal masses of methanol,ch3oh, and ethanol, ch3ch2oh what is the mole fraction of eachcomponent in the mixture
- Q Chemistry question: We did an experiment in lab and I need tofigure out how to A) calculate the mols of NaOH used in titrationB) calculate mols HCl in titration C)...
- Q The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 =7.65. Calculate the pH at each of the following points in thetitration of 50.0 mL of...
- Q A mixture 0.500 mole of carbon monoxide and 0.400 mole ofbromine was placed into a rigid 1.00 L container and the system wasallowed to come to equilibrium. The equilibrium concentration...
- Q 3O2(g) + 4NH3(g) 6H2O(g) + 2N2(g) Initially (before any reactionoccurs) a 1.00 liter reaction vessel at 400 °C contains 0.428 molesof O2(g) and 0.773 moles of NH3(g) and no water...
- Q 4. Calculate the equilibrium concentration of Ag+(aq) in a solution that is initially 0.150 M AgNO3 and0.500 M KCN. The formation constant for[Ag(CN)2]- (aq) is Kf= 1.0 x1021a. 8.9 x...
- Q Provide the correct Lewis structure and ALL legitimate resonancestructures for Sulfuric acid. Alo indicate which resonancestructures contributes most/best to the behavior of this molecule.Justify your answer.
- Q Complete the following equation that illustrates a BronstedLowry acid-base reaction. Phases are optional. HCl + NH3--->
- Q An atom with a total of _______ electrons is mostlikely to become an anion.109117
- Q Phosphorus pentachloride decomposes according to the chemicalequation PCl5(g) -ïƒ PCl3(g) + Cl2(g) A 0.213 mol sample of PCl5(g)is injected into an empty 3.40 L reaction vessel held at 250degrees C....
- Q Buffer capacity is a measure of a buffer solution\'s resistanceto changes in pH as strong acid or base is added. Suppose that youhave 135 mL of a buffer that is...
- Q When a metal was exposed to photons at a frequency of 4.68× 1015s–1, electrons were emitted with a maximum kinetic energy of 5.70×10–19 J. Calculate the work function of this...
- Q Bromine is sometimes used as a solution in tetrachloromethane,CCl4. What is the vapor pressure (in mm Hg) of a solution of 6.40 gof Br2 in 114.5 g of CCl4 at...
- Q Bridget, a Chemistry of the Sea IA, is sitting at home on aFriday night and decides to entertain herself by making syntheticseaw ater with chemicals she has around the house...
- Q A mixture of carbon and sulfur has a mass of 9.0 g. Completecombustion with excess O2 gives 26.0 g of a mixture of CO2 andSO2.Find the mass of sulfur in...
- Q A compound contains only carbon, hydrogen, and oxygen.Combustion of 21.16 mg of the compound yields 48.04 mg of CO2 and16.4 mg of H2O. The molecular weight of the compound is114.1g/mole....
- Q A solid mixture consists of 39.1 g of KNO3 (potassium nitrate)and 6.9 g of K2SO4 (potassium sulfate). The mixture is added to130. g of water.A. Consider the mixture described in...
- Q synthesis reaction for dopamine to mdma
- Q PART A:In a liver cell at 37 ?C the concentrations of both phosphateand glucose are normally maintained at about 5 mM each. What wouldbe the equilibrium concentration of glucose-6-phosphate,according to...
- Q Explain the remarkable stability of Borazine?
- Q An unknown mass of sodium hydroxide is dissolved in 500 g ofwater. This solution is neutralized by adding successively 18 g ofCH3COOH, 25.2 g HNO3, and 29.4 g of H2SO4....
- Q Write a molecular equation for the precipitation reaction thatoccurs (if any) when each set of solutions is mixed. If no reactionoccurs, write NOREACTION. 1. sodium chloride and lead(II) acetate2. lithium...
- Q You need to determine the concentration of a sulfuric acidsolution by titration with a standard sodium hydroxide solution.You have a 0.1539 M standard solution. You take a 25.00 mL sampleof...
- Q Hydroboration-oxidation of an alkene,C7H12, gives a single product that exhibits13C spectral data below.Broadband-decoupled 13C NMR: 26.1, 26.9,29.9, 40.5, 68.2 δDEPT-90: 40.5 δDEPT-135: positive peaks at 40.5; negative peaks at26.1, 26.9,...
- Q During chemical weathering, forsterite is dissolved by thecarbonic acid in rainwater. The weathering reaction is:Mg2SiO4 forsterite + 4H2CO3 (aq) ? 2Mg2+ + 4HCO3- + H4SiO4 (aq)Use the thermodynamic data from...
- Q In a 61.0-g aqueous solution of methanol, CH4O, the molefraction of methanol is 0.320. What is the mass of eachcomponent?
- Q 2. a. What is the molality used of 2.00 g ethylene glycol in20.0 g TBA?b. Predict the freezing point of this solution
- Q Use the periodic table to write electron configurations for eachof the following elements. Represent core electrons with the symbolof the previous noble gas in brackets.Part APExpress your answer in condensed...
- Q 3) A reaction vessel at 27 ∘C contains a mixture of SO2(P= 3.10atm ) and O2(P= 1.10 atm ). When a catalyst is added the reaction2SO2(g)+O2(g)⇌2SO3(g) takes place. At equilibrium...
- Q In a 59.0-g aqueous solution of methanol, CH4O, the molefraction of methanol is 0.120. What is the mass of each component?Mass of (g) CH4O? Mass (g) of H2O?
- Q Five kilograms of water is contained in a rigid, 3 m3 vessel atP = 1 bar.A. What is the temperature and physical state (liquid, vapor, orboth liquid and vapor) of...
- Q caffeine the freezing point of a solution prepared by dissolving150 x 10^-3 g of caffeine in 10.0 g of camphor is lower by 3.07Cthan that of pure camphor (Kf =...
- Q A 0.1000 M NaOH solution was employed to titrate a 25.00-mLsolution that contains 0.1000 M HCl and 0.0500 M HOAc.a) Please determine the pH of the solution after 27.00 mL...
- Q For the reaction 2A(g)⇌B(g)+2C(g), areaction vessel initially contains only A at a pressure ofPA=270 mmHg . At equilibrium, PA=55 mmHg .
- Q A beaker with 115 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q The Ka's for H2CO3 are K1 = 4.5 x 10^-11. Calculatethe pH of the solution when 45.9 ml of 0.25 M KHCO3 is mixed witha)35 mL 0.15 M HBr.    b)...
- Q Powder diffraction for a pure metal yields the following dhklspacings values (nm): 0.2088, 0.1808, 0.1278, 0.1090, 0.1044,0.09038, 0.08293, and 0.08083. A monochromatic x-radiation having awavelength of 0.1542 nm was used....
- Q What is the pH of a 0.305 M solution ofH2SO4? Ka2 =1.20 x10-2
- Q Construct a cooling curve (looks the same as a heating curve)for a substance with a molar mass of 200 that has a gas phasespecific heat capacity of 2.9 J/g-K, a...
- Q 1. Suppose that the atmosphere were perfectly uniform, with adensity throughout equal to that of air at 0 o C, 1.3 g L-l . (a)Calculate the thickness of such an...
- Q In regards to the synthesis of 9-fluorenone via sodiumhypochlorite oxidation of 9-fluorenol (9-Fluorenol ->9-fluorenone) lab answer the following question:What would happen if this oxidation were carried out with9-methyl-9-fluorenol?
- Q Calculate the molar solubility of Ag2CrO4Â Â Ksp=1.1x10^-12, including net ionic equations. a)0.045 MK2CrO4Â Â b)0.0085 M KOH
- Q In an analysis of interhalogen reactivity, 0.350 mol ICl wasplaced in a 5.00 L flask and allowed to decompose at a hightemperature.                2ICl(g) I2(g) + Cl2(g)                                Calculatethe equilibrium concentrations of I2, Cl2,...
- Q Catalytic antibodies are prepared against a transition stateanalog of a substrate.Do catalytic antibodies work because they maximize kcat orminimize Km? Justify answer.
- Q During fatty acid activation high energy bonds are broken andnew high energy bonds are formed. Calculate the energy cost of theprocess.
- Q Calculate the concentrations of all the species in a0.301 MNa2CO3solution.[CO32−]=  M[Na+] =  M[HCO3−] =  M[OH−] =  M[H2CO3] =  × 10M(Enter your answer in scientific notation.)[H+] =  × 10 M(Enter your answer in scientific notation.)
- Q a) How many mL of 0.1 M Sr(OH)2 will be added to a beakercontaining 150 mL of 0.16 M HClO4 (aq) to reach the equivalencepoint?b) What is the pH of...
- Q A nitric acid solution, pH=2.7, results from NOxremoval from a stack gas. Neglect ionic strength effects and thetemperature is 25oC. How much Na2CO3must be added to neutralize this solution prior...
- Q Using the 12 graphs explain:1) How does the initial reactant concentration affect:the initial reaction rate?the overall reaction order?the rate constant?2) How does the temperature affect:the initial reaction rate?the overall reaction...
- Q Write a brief description of the double slit experiement and thewave nature of the electron.
- Q 1. Describe the steps involved in a sampling operation. 2.Discuss the purpose of a sampling step in an analysis. 3.Differentiate between a bulk sample and a laboratory sample 4.Discuss the...
- Q Identify each of the following experimental occurrences ascontributing to systematic error “Sâ€, random error “Râ€, both typesof error “Bâ€, or neither (does not cause error) “N†Write the codeletters S,...
- Q Which of the following statement regarding energy flow areaccurate?a. If the reactants have higher internal energy than theproducts, ΔE sys is positive and energy flows out the system intothe surroundings.b.If...
- Q Calculate the pH and moralities of all the species in a 0.150 Mammonia solution. Ka = 5.55 x 10-10
- Q Draw the following names in line notation and check to see if ithas been named correctly according to IUPAC nomenclature. If it isincorrect, name it correctly. 1.)trans-2-propyl-1-methyl-3,3-diethylcyclopentane2.)Â Â 4R-chloro-6R-(2,2-dimethylpropyl)octane
- Q Kinerics of the Oxidation of a Water Soluble Dye:Explain and provide a written example about the kinetics of theoxidation reaction of blue dye (used as a food coloring) by commonhousehold...
- Q 20.00 mL of 3.00E-3 M Fe(NO3)3 is mixed with 8.00 mL of 2.48E-3M KSCN and 12.00 mL of water. The equalibrium molarity of Fe(SCN)2+is found to be 6.82E-5 M. If...
- Q Is functional group (hydroxyl, amino, sulfhydryl, phosphate, carboxyl) acidic or basic? Can you explain it really easy like how do you know which one is more basic? I have to...
- Q Asolution was prepared by dissolving 29.0g KCl in 225 g of water.1) Calculate the mass percent of KCl in the solution.2)Calculate the mole fraction of the ionic species KCl in...
- Q 1. the hydrogen released by the reaction of 90 grams of nitricacid on aluminum, was used to make ammonia. How many grams ofammonia were formed ? 3. How many grams...
- Q Enzymes. When k2 is very small compared to k–1 the KM becomes aKd (or in some textbooks this is called a KS ) for the ES complex.A Kd is really...
- Q Draw the structures of: water, glycerol, ethylene glycol,acetone, hexane, and methanol. Name and briefly describe theintermolecular attractive forces (IMAF) you would expect to findfor each of the drawn structures. Be...
- Q During the standardization of NaOH, the mass of pure potassiumbiphthalate is 0.3001 g. The volume of NaOH used is 13.54 mL. Whatis the molarity of the NaOH solution in M...
- Q Rank the substituents shown below in order of Cahn-Ingold-Prelogpriorities (1 = highest priority group, 4 = lowest priority group).(a) -CCH (b) -CH=CH2 (c) -CH2CH3 (d) -CH3
- Q Kinetics of the Oxidation of a Water Soluable Dye: Explain thefollowing three factors - (1) Discuss the kinetics of the oxidationreaction of blue dye (used as a food coloring) by...
- Q Part AA beaker with 1.00×102 mL of an acetic acid bufferwith a pH of 5.000 is sitting on a benchtop. The total molarity ofacid and conjugate base in this buffer...
- Q How is Histidine used to modulate protein activity?
- Q 1. Draw two molecules that are examples of constitutionalisomers. Are your examples skeletal or positional isomers?2. Draw the cyclohexane ring in the chair and boatconformations.3.What is meant by the phrase...
- Q Why are positive ions analyzed in Mass Spectroscopy? Is ittheoretically possible to analyze negative ions? Give an example,when it is desirable to monitor negative ions.
- Q Suppose that 24 g of each of the following substances isinitially at 29.0 ∘C. What is the final temperature of eachsubstance upon absorbing 2.45 kJ of heat?silvergoldaluminumwater
- Q What are the consequences of deficiencies of the acyl-CoAdehydrogenase enzyme? Discuss the normal role of the enzyme, andhow reduced activity impacts fatty acid metabolism. Whatmetabolites used for fuel do you...
- Q A solution made by dissolving aspirin,C9H8O4, in chloroform,CH3Cl had a boiling point of 61.84°C. What is thefreezing point depression of this solution? Given the followinginformation for the solvent: the boiling...
- Q what is the solute solvent interactions of NaBr in waterHCl in acentonitrile &CF4 in hexane
- Q 1. In each of A-C, below, indicate whether:a) the statement is possible under the laws of thermodynamics;b) the statement violates the FirstLaw; c) the statementviolates the Second Law. In the...
- Q 1.Historians divide Colonial America into three distinctregions. Compare and contrast these three different areas anddiscuss why each region developed in a unique way.2. Compare and contrast the society that developed...
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