Chemistry question and answers for September 11, 2023
- Q How and where does lactose undergo digestion in the body. Namethe products.
- Q How might you use 2,4-dinitrophenylhydrazine to determine if thecrude product obtained from the Grignard reaction between phenylmagnesium bromide and benzaldehyde contains unreacted benzaldehydeas an impurity? Use an equation to illustrate...
- Q How much energy per mole is required to transfer acetic acid, abyproduct of ethanol metabolism from blood to urine. The relevantconcentrations are 39.00 and 742.00 ppm respectively and you arerunning...
- Q If 0.30 M HCOOH (weak acid) is prepared, what will be thehydronium ion concentration at equilibrium at 25
- Q describe, in term of shielding and effective nuclear charge, thefollowing phenomena:1. why, for main group elements, do atomic radii decreasegoing from left to right across the periodic table?2. why, for...
- Q A gas cylinder is filled with 211 torr of N2 and 615 torr of F2and the resulting reaction forms NF3 at constant temperature andvolume. N2(g) + 3 F2(g) ⎯→ 2...
- Q Which of the following contain a coordinate covalent bond?Check all that apply.Check all that apply.H3O+H3O+H2OH2OBF−4
- Q The three-dimensional structure of the potassium channelprovided a rationale for the selectivity of potassium ions and therejection of sodium ions. Which of the following is the basis forthe ability of...
- Q 1. Z-2-chlorocyclopentanol and E-2-chlorocyclopentanol eachreact with NaOH to eliminate HCl but they give different finalproducts C5H8O. Show how each forms2. The reactions of bromotrichloromethane with toluene in thepresence of a...
- Q Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71mL of 0.54 M HCl to 59 mL of the buffer. What is the new pH of...
- Q 1, Why use ninhydrin reagent and iodine crystals as visualizingagent in TLC?2. Differentiate TLC and Column Chromatography based on a)separation of components in mobile and stationary phases b) solventmitigation c)...
- Q Ammonia, NH3, is a weak base with a Kb value of1.8×10−5.Part AWhat is the pH of a 0.270 M ammonia solution?Part BWhat is the percent ionization of ammonia at thisconcentration?
- Q A manufacturing facility requires saturated steam at 120°C at arate of 1.2 kg/min. Design an electric steam boiler for thispurpose under these constraints: • The boiler will be incylindrical shape...
- Q A. draw all the possible stereoisomers for1-bromo-1,4-dimethylcyclohexane and identify the relationship ofthe pairs of isomers to each other.B. 1-bromo-1,4-dimethylcyclohexane reacts with methanol (CH3OH).Show the mechanism and products. Show stereochemistry of...
- Q Taken Organic Chemistry Second Edition! We are in the thirdweek, and I need a conclusion of of the report.We are testing Aspirin Productswe used buffered aspirin, 10% of NaOH, 1%...
- Q A buffer is prepared by mixing 4.00g of sodium acetate(NaC2H3O2.3H2O) and10.00mL 3.0M acetic acid. Ka = 1.8x10-5 foracetic acid.a) Calculate the pH of the buffer.b) If we add 5.00mL of...
- Q Using a 0.20 M phosphate buffer with a pH of 7.6, youadd 0.76 mL of 0.45 M NaOH to 47 mL of the buffer. What isthe new pH of the...
- Q Part AHow much heat energy, in kilojoules, is required to convert 42.0g of ice at − 18.0 ∘C to water at 25.0 ∘C ?Express your answer to three significant figures...
- Q Would a molecular orbital diagram be appropriate todescribe bonding in Ti? Explain.
- Q Dumas Method Experiment:In this experiment, we measured a flask with an aluminum foiland elastic band set up then added 4mL of methanol inside the flaskand sealed with the foil covering...
- Q What is an element that shares group properties withMg? What properties are common in this group?
- Q I know what an Electrolyte and a non-electrolyte is, but how doI relate the number of particles in a given solution to the type ofsolute (electrolyte or non-electrolyte).
- Q 1. Describe the scope (types of R groups etc.) advantages andlimitations (functional group tolerance, solvent considerations,air/water sensitive etc.) for the Heck coupling reaction.2. What is the relative reactivity of aryl...
- Q What is a buffering region?What is the Bohr Effect?
- Q Elemental S reacts with O2 to form SO3 according to the reaction2S+3O2→2SO3.Part A How many O2 molecules are needed toreact with 5.69 g of S? Express your answer numerically inunits...
- Q 1. Give examples of three important types of chemical reactionsthat occur in biochemical systems.2. How is a standard thermodynamic state defined for biochemicalsystems?3. Explain what is meant by a term...
- Q An equimolar liquid mixture of benzene and toluene at 10C isfed continuously to a vessel in which mixture is heated to 50C. Theliquid product is 40 mole%B and the vapor...
- Q 1. please explain the reason behind ruthenium ligand rate. a)why is it slow? b) what does geometry has to do with the slow ratec)what is the role with thermodynamics and...
- Q The following initial rate data are for the reaction ofammonium ion with nitrite ion in aqueous solution:NH4+ + NO2- N2 + 2 H2OExperiment [NH4+]o, M [NO2-]o, M Initial Rate, Ms-11...
- Q 3. Use the information in problem 1 and theexperimental data from a tracer study shown in the table below toanswer the following questions.t (min)C (mg/L)t (min)C (mg/L)t (min)C (mg/L)00300.174853.24550350.3051054.085100450.6541254.570150551.2191454.823200.028651.9161654.968250.073752.6291855.064a).  (2...
- Q In isolated thylakoid membranes you measure, through the use ofmolecular probes, a transmembrane potential of delta psi = + 60 mVand a delta pH of 2- (inside acidic) across the...
- Q Potassium nitrate, KNO3KNO3, has a molar mass of 101.1101.1g/mol. In a constant-pressure calorimeter, 44.644.6 g of KNO3KNO3is dissolved in 201201 g of water at 23.00 °C23.00 °C.KNO3(s)H2O−−→K+(aq)+NO−3(aq)KNO3(s)→H2OK+(aq)+NO3−(aq)The temperature of the...
- Q Phosphoric acid is a triprotic acid (Ka1=6.9×10−3Ka1=6.9×10−3,Ka2=6.2×10−8Ka2=6.2×10−8, and Ka3=4.8×10−13Ka3=4.8×10−13).To find the pH of a buffer composed of H2PO−4(aq)H2PO4−(aq) andHPO2−4(aq)HPO42−(aq), which pKaKa value should be used intheHenderson–Hasselbalch equation?pKa1Ka1 = 2.16pKa2Ka2 =...
- Q [8] What are acids and bases? Describe the two terms givingexamples that you commonly use. Explain the term ‘pH’, itsequation, and provide a few numbers representing the pH scale!Explain the...
- Q [A], M   [B], M                Δ[C]/ Δ t       (initial) M/s0.215     0.150                   5.81x 10–40.215     0.300                   1.16x 10–30.430     0.150                   2.32x 10–3Given the initial rate data for the reaction A + B ? C,determine the rate expression for...
- Q van der Waals Cycles For all cycles in this section, assume thatyou have exactly 1.000 moles of gas and that the cycle is runreversibly. The known state parameters for the...
- Q Consider a CSTR used to carry out a reversible isomerizationreaction (A↔B) where both the forward and reverse reactions arefirst-order. Feed is pure A and the reaction is assumed to beelementary....
- Q A single crystal of a metal is oriented for a tensile test suchthat its slip plane normal makes an angle of 64.2° with the tensileaxis. Three possible slip directions make...
- Q ± Pressure-Based versusConcentration-Based Equilibrium ConstantsPart A.) For the reaction3A(g)+3B(g)⇌C(g)Kc = 67.6 at a temperature of 287 ∘C .Calculate the value of Kp.Part B.) For the reactionX(g)+3Y(g)⇌3Z(g)Kp = 1.65×10−2 at a...
- Q these solutions (2-5) will each be in their own 50mL volumetric flask.assigned pH for buffer system: 4.75acid/base pair to use: acetic acid and sodium acetateconcentration of acetic acidamount of acid...
- Q Consider a buffer solution that contains 0.25 MC6H4(CO2H)(CO2K) and0.15 M C6H4(CO2K)2.pKa(C6H4(CO2H)CO2-)=5.41.1. Calculate its pH2. Calculate the change in pH if 0.140 g of solid NaOH is addedto 190 mL of...
- Q What is the concentration of each of the following solutions?(a) The molality of a solution prepared by dissolving 25.0 g ofH2SO4 in 1.30 L of water (b) The mole fraction...
- Q A) What is the pH of a solution created by combining 1.28 moleof HOBr and 0.52 mole NaOH in a 1.00L solution? Ka HOBr= 2.5 x 10-9B) What is the...
- Q The hydrolysis of table sugar (sucrose) occurs by the followingoverall reaction sucrose + water → glucose + fructose and is firstorder in sucrose concentration with a rate constant of 3.50...
- Q Part AWrite the anode and cathode reactions that cause the corrosionof iron metal to aqueous iron (II).Express your answer as a chemical equation. Identify all of thephases in your answer.anode...
- Q a) I found this data when comparing 5 different reactions, usingvarious concentrationsWhen S2O8] remains constant (0.0400M):Reaction 1 and 2: The [I-]concentration doubles from 0.0400M to 0.0800M, while the rate andrelative...
- Q Calculate the pH and [H3O+] of the following solutions:a) 0.20 M potassium hydroxide (KOH, strong base)b) 0.10 M propanoic acid (CH3CH2COOH, Ka = 1.3 x 10-5)c) 1.50 M diethyl amine...
- Q Calculate the Ecell and ΔG of redox reactions at 25 degreesCelsius with the following conditions:a) n = 1 and K = 5.0 x 10^-6b) n = 2 and K =...
- Q how many grams of sodium bromide are there in 55.0mL of a 1.90Maqueous solution? please answer as soon as possible and show workthank you
- Q CH 14The reaction2H2O2(aq)→2H2O(l)+O2(g) isfirst order in H2O2 and under certain conditions has a rateconstant of 0.00752 s−1 at 20.0 ∘C. A reaction vessel initiallycontains 150.0 mL of 30.0% H2O2 by...
- Q 1. Define and compare elemental, inductive and resonanceeffects.2. Define and compare various intermolecular forces.3. Illustrate how intermolecular forces effect physicalproperties.4. Draw and name all isomers of C5H12.5. Define and discuss...
- Q Please make sure to display your thought process? It isimperative to be able to follow how the answer was deduced. Pleasebe as thorough as possible. Please address all parts as...
- Q 1) How many liters of 0,.775 M solution can be prepared from55.0 g of MgBr2?2) Calculate the molarity of all ions present when 12.5g ofpotassium chlorate is dissolved in 85.0...
- Q A solution is prepared that contains 10 mM NaCl, 20 mMCaCl2, 20 mM BaCl2, and 50 mMNiNO3. Of course, all these salts completely dissolve totheir respective cations and anions. The...
- Q A sample of a substance with the empirical formula XCl2 weighs0.5555 g. When it is dissolved in water and all its chlorine isconverted to insoluble AgCl by addition of an...
- Q A 9.15 g sample of an aqueous solution of hydroiodic acidcontains an unknown amount of the acid. If 29.3 mL of 0.506 Msodium hydroxide are required to neutralize the hydroiodic...
- Q 1a) An electric range burner weighing 698.0grams is turned off after reaching a temperature of463.5°C, and is allowed to cool down to22.0°C.Calculate the specific heat of the burner if all...
- Q 4-A. Can a fuel cell be both an electrollzer producing hydrogenand a power source producing electricity and heat?B. Storage batteries have great potential for storing off-peakpower as well as accommodating...
- Q The next 11 questions are related to the titration of 25.00 mLof a 0.0750 M acetic acid solution with 0.0750 M KOH. Assume thatthe temperature is 25 oC.What is the...
- Q The following information is given for magnesium at 1atm:boiling point = 1.090E3
- Q The solubility product constant for barium sulfate is 1.1 x10^-10 Will a precipitate of BaSO4 form when 210 mL of 4.75 x 10^-2MBa (NO3)2 is mixed with 315 mL of...
- Q What mass of NaCO3 is required to remove 90% of these ionsfrom10.0L of laundry water?Since soap and detergent action is hindered by hard water,laundryformulations usually include watersofteners-calledbuilders-designed to remove hard...
- Q Calculate the concentrations of all fivechemical species present in a 0.750 M solution of hypoiodousacid.
- Q Use Le Châtelier's Principle to fully explain what happenswhen excess HCl is added to a blue coloured solution of bromothymolblue. Refer to the appropriate equation(s)Use Le Chatalier's Principle to fully...
- Q What is the molality of a solution of naphthalene in benzene ifthe freezing point of pure benzene is 5.5°C and the freezing pointof the solution is 4.0°C. The freezing point...
- Q Does gelatin contain tyrosine? How do you know?
- Q Consider the equilibrium shown.PbBr2(s)−⇀↽− Pb2+(aq)+2Br−(aq)Ksp=2.10×10−6Determine the concentrations of Pb2+ and Br− in a saturatedsolution of PbBr2 in pure water (assume μ=0 M).[Pb2+]=M[Br−]=MDetermine the concentrations of Pb2+ and Br− in a...
- Q Which compound has the smallest molecular weight? A. Al(OCH3)3B. Ga(OCH3)3C. B(OCH3)3 D. (BO(OCH3))2
- Q Discuss the advantages and drawbacks of the open molding methodin thermoset composite processing.
- Q CrosswordACROSS 1. Spectrum of the specific wavelengths at whichcompounds absorb3. In Beer Lambert’s Law __________ is proportional toabsorbance.4. Spectrum with wavelength lower than 340nm9. The ________ in a spectrometer captures...
- Q 5. Describe various types of emulsions and how to identifythem?6. How come emulsion can increase the solubility of hydrophobicmolecules?
- Q For all cycles in this section, assume that you have exactly1.000 moles of gas and that the cycle is run reversibly. The knownstate parameters for the cycle will be given...
- Q Determine whether the following molecules are polar or nonpolar:(a) NBr3 (b) OCSÂ Â (c) XeF4
- Q In the (Bomb Calorimetry)experiment, 1.10 g of anthracene (C14H10) wasburned in a constant volume bomb calorimeter. The temperature ofwater rose from 20.28 °C to 24.05 °C. If the heat capacity...
- Q A solution of ethanol CH3CH2OH and water that is 10.% ethanol bymass is boiling at 98.7°C. The vapor is collected and cooled untilit condenses to form a new solution.Calculate the...
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