Chemistry question and answers for August 21, 2023
- Q In Michaelis-Menten kinetics, what values would make an enzyme“good†at catalysis?
- Q a) Which electrons experience a greater Zeff(effective nuclear charge): the valence electrons in Be or thevalence electrons of N? Why?Using the simple equation on page 260, calculate theZeff of 3p...
- Q If the Ksp of PbI2 is 7.1 X 10-9, willprecipitation occur when 10 mL of 1.0 X 10-4 MPb(NO3)2 is mixed with 10 mL of1.0X10-3 M KI?Will precipitation occur when...
- Q 2. Calculate the gravimetric factor for the following: (a) Cr2O3in Ag2CrO4 (b) CaO in CaCO3,3.Describe briefly the mechanism of precipitate formation.
- Q whywas lead nitrate positive for egg albumin but not gelatin?
- Q 160 g of a 0.80% sodium hydroxide solution.The following question involves the reaction of sodium hydroxideand succinic acid. Succinic acid is diprotic: the acid(H2C4H4O4) reacts withtwo of its hydrogens to...
- Q State (2), explain (2), and derive (6) Gibbs’ Phase rule for asystem with C components occurring in P different phases.
- Q In this week's experiment, the heat of vaporization of liquidnitrogen is determined by measuring the change in temperature of aknown sample of warm water when liquid nitrogen is added.In one...
- Q The complex ion Cu(NH3)42 is formed in a solution made of 0.0200M Cu(NO3)2 and 0.400 M NH3. What are the concentrations of Cu2 ,NH3, and Cu(NH3)42 at equilibrium? The formation...
- Q So, I have some questions about the analytical chemistryexperiment \"Titrations based on complex formation.\"1- Can you determine Mg by displacement or back titration?2- You need to know the amount of...
- Q A 7.50 -L container holds a mixture of two gases at 33 °C. Thepartial pressures of gas A and gas B, respectively, are 0.214 atmand 0.571 atm. If 0.220 mol...
- Q What mass of water would need to be added to 4.25g saltto make the solution 28% salt?
- Q the Diels -Alder reaction between Maleic Anhydride and furan (balanced chemical equation and theoretical yield)- 0.20 g of maleic anhydride and 2.5 of diethyl ether- 0.20 ml of furanCan you...
- Q Question 1 (1 point)Which one of the following species would NOTreact with free radicals?Another free radicalCarbon-Carbon double bondsCarbon-Oxygen bondsCarbon-Hydrogen bondsQuestion 2 (1 point)What is a requirement for the halogenation ofalkanes...
- Q how to synthesise of choline?
- Q The synthesis of methanol from carbon monoxide and hydrogen iscarried out in a continuous vapor phase reactor at 5.00 atmabsolute. The feed contains CO and H2 in stoichiometricproportion and enters...
- Q 5. Write in your own words, the step-wise experimental procedurefor the synthesis of the unknown organic compound.6. How will the structure of your organic product be determinedusing the 1HNMR data...
- Q The reaction in which cyclohexanone is turned into cyclohexanol.It is a 1; 1 reaction- 1 moleculeof cyclohexanone produces 1 molecule of cyclohexanol100 microLiters ( 95 mg, 0.97 mmol) of cyclohexanone...
- Q Using the standard values of enthalpy changes (ΔH°) and entropychange (ΔS°) to calculate the Gibbs free energy change for theproduction of following metallic elements from their ore sources:(a) 2ZnO(s) 2Zn(s)...
- Q What is the Frank-Condon principle?​
- Q Consider the following reaction:CO2(g)+CCl4(g)⇌2COCl2(g)Calculate ΔG for this reaction at25 ∘C under theseconditions:PCO2= 0.140 atmPCCl4 = 0.170 atmPCOCl2= o.740 atmΔG∘f for CO2(g) is −394.4kJ/mol, ΔG∘f for CCl4(g) is−62.3kJ/mol, and ΔG∘f for...
- Q Choose the most likely pattern for the crystal field diagram forthe complextrans–[Ni(NH3)2(CN)4]2–where CN– produces a much stronger crystal field thandoes NH3.?From the answer the pattern show it is a square...
- Q Which of the following is NOT a difference of archaeal membranelipids relative to those of other organisms?A backbone other than glycerol is used.Fatty acid esters are replaced with long chain...
- Q Newton’s laws of motion, such as trajectory and momentum, do notapply to subatomic particles as they do to larger objects such asbaseballs. Research how subatomic particles (protons, neutrons, andelectrons) behave...
- Q Which ONE of the following represents the CORRECT equilibriumconstant expression for the reaction:H2PO4 ¯ + OH¯ ⇔ HPO42-+ H2O(a) 1/kb(b) 1/ka (c)kw/ka(d) kw/kb(e)kb/kw
- Q fter thoroughly reviewing the physical process of capillaryaction and surface tension and viscosity, write a thoughtful,complete, but concise response to the following: Explain howcapillary action is used to transport water...
- Q for azo dyes, why does an instantaneous and dramaticcolor change occur when the two coupling reagents are mixedtogether?
- Q what is the difference between an amorphous, anoriented, and a crystalline plastics?
- Q What is the constituent particle, bond type, texture (hard,soft, brittle, malleable, ductile), conductivity, melting point(high, intermediate, low, variable), solubility of:Molecular SolidsCovalent Network StructuresIonic NetworksMetallic NetworksDiscrete MoleculesExtended Structures
- Q If 0.175 L of 0.364 M ammonia solution is titriated with 0.095 Lof 0.35 M HCI, what is the pH of the resulting solution?
- Q A student needs 62.5 g of zinc sulfide, a white pigment, for anart project. He can synthesize it using the reaction: Na2S (aq) +Zn(NO3)2 (aq) = ZnS(s) + NaNO3 (aq)...
- Q Given what you know about the pharmacophore of morphine (ie drawthe new compound) that will convert the compound from an agonist(morphine) to an antagonist (your experimental compound).
- Q 1)Put the following chromatography solvent in order ofpolarity as a chromatography solvent: acetone, n-propanol, water,hexane, diethyl ether, methanol.2) You will be doing chromatography with a mixture of n-propanoland water. Would...
- Q The atmosphere slowly oxidizes hydrocarbons in a number of stepsthat eventually convert the hydrocarbon into carbon dioxide andwater. The overall reactions of a number of such steps for methanegas isCH4(g)+5O2(g)+5NO(g)→CO2(g)+H2O(g)+5NO2(g)+2OH(g)Suppose...
- Q please write it by your own.Analysis Based [Short Answers; ANY 2 less than 100 words]1. The foam produced by the used of detergents, is harmful toaquatic life. Explain Why?2. What...
- Q 1. Calculate the concentration of the AgNO3 solution.2. Use your AgNO3 concentration to determine the concentrationof the KSCN titrant from your standardization titrations. (SeeEquation 6-1)3. Determine the amount of excess...
- Q 1) a) How would you make 600 ml of a 0.25 M ammonia and 0.20 Mammonium nitrate from a bottle of 6.0 M ammonia (aq) and a bottleof solid ammonium...
- Q (1)Â Â What do you assume theentropy S for a perfect crystal when T = 0?(2)Â Â Is the S(0) still zeroif the crystal is not perfect? Why?(3)Â Â How to calculate dSwhen...
- Q TLC analysis of an unknown sample using pure ethyl acetate as adeveloping solvent gives a single spot with an Rf value of0.08.A. Explain why this result doesn't guarantee that the...
- Q Using the set of smallest whole number coefficients to balancethe redox equationMnO4- + NO2- --->MnO2 + NO3-in basic solution, you geta) 2 OH- on the right.b) 3 OH- on the...
- Q A solution is prepared by mixing 25.0g pentane with 75.0ghexane. The density of the solution is 0.65g/mL. Determine themolarity and the molality of the solution.*Please be as thorough as possible...
- Q Integrated Rate Laws: Working with Zero Order ReactionsExperiments have shown the following reaction to be zero order witha rate constant = 2.50 10-1 M/sec. A → B + 2 C...
- Q A flask contains 30.5 g of oxygen gas, 45.7 g ofsulfur dioxide gas and 23.9 g of fluorine gas. If the totalpressure of the flask is 1.45 atm, what is...
- Q 4. What conditions need to be present in order for theHenderson- Hasselbach equation to be used?pH=pKa+log [A-]/[HA]A- There needs to be equal amounts of an acid and abase.B- Only a...
- Q A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+salt and the other half-cell with a Cd bar in the same volume of a1.00 M...
- Q Calculate the change in Gibbs free energy for each of thefollowing sets of ΔH∘rxn, ΔS∘rxn, andT.ΔH∘rxn=− 132 kJ ; ΔS∘rxn= 260 J/K ;T= 310 KΔH∘rxn= 132 kJ ; ΔS∘rxn=− 260...
- Q Using the sample in question 3, how many counts per second wouldbe observed when the detector is 10 meters away from the sample? 5.If a 10 gram sample of a...
- Q 1. How many grams of ethyleneglycol, C2H4(OH)2, are needed per kilogram of water to protectradiator fluid against freezing down to -10°C?2. For benzene, C6H6, the freezing point constant, Kf, is...
- Q A. Calculate KP at 298 K for the reactionNO(g)+12O2(g)→NO2(g) assuming that ΔH∘R isconstant over the interval 298-600 K.B. Calculate KP at 486 K for this reactionassuming that ΔH∘R is constant...
- Q Use standard heat of formations to find the heat for thecombustion of 5.0 g of Methane gas CH4 to form carbon dioxide andwater vapor
- Q I've literally asked this question 4 times now... its pretty sadpeople can't read as smart as they are to be able to answer thesequestions....What amount of energy is required to...
- Q At 25ºC the osmotic pressure of an aqueous CaCl2 solution is9545.4 torr; the solution has a density of 1.71 g/mL. Calculate thenew boiling point of this solution in Celsius. Assume...
- Q you are asked to prepared 1-bromo-2,2,3,3-tetramethlylbuane byexposure to 2,2,3,3-tetramethylbutane to Br2 in the presence oflight. How can yield of this monobrominated product be maximizedwhile minimazing the formation of polybrominated product?
- Q What are 3 interactions that affect solubility, andhow they affect solubility?
- Q A series of volumetric flasks are being prepared for theanalysis of mercury in the drinking water supply using the methodof standard addition. To prepare the flasks, 10 mL of drinkingwater...
- Q Nitrogen and oxygen do not react appreciably at roomtemperature, as illustrated by our atmosphere. But at hightemperatures, the reaction below can proceed to a measurableextent. N2(g) + O2(g) ⇔ 2...
- Q A mixture of benzene (C6H6), toluene (CH3C6H5) and methane (CH4)was injected into a gas chromatograph column that is12.5 m long.The peaks were observed at 40 s (methane), 260 s (benzene),...
- Q Describe the trends in properties for the elements belonging toGroup VI A in the periodic table. How do the following propertiesvary down the group?a. Atomic Radiusb. 1st Ionization Energyc. Electron...
- Q Determine the colligative (effective) molality of atruly saturated salt solution and the freezing point of a trulysaturated salt solution (solubility limit of NaCl is 35.7 g)
- Q Prove that Inter energy is Independent of the path
- Q A solution contains 3.50 mol of water and 1.50 mol ofnonvolatile glucose (C6H12O6).a. What is the mole fraction of water in this solution?b. What is the vapor pressure of the...
- Q 6. A student carries out a calorimetry experimentusing HCI and NaoH. What effect will each of the following have onthe calculated enthalpy of the reaction relative to the actualenthalpy of...
- Q Please answer ALL 3 questions and provide explanations :)4. A given mass of oxygen at room temperature occupies a volumeof 500.0 mL at 1.50 atm pressure. What will be the...
- Q Find the velocity of an electron emitted by a metal whosethreshold frequency is 2.27×1014 s−1 when it is exposedto visible light of wavelength 5.11×10−7 m .
- Q 1) An unknown compound is found to burn in oxygen. When bromineis added to this unknown, the solution remains orange. What can besaid about the unknown compound?2)When a purple solution...
- Q 1) A. How does the following modifications affect the rate of asquare planar substitution reaction?a) changing the trans ligand from H- to Cl-b) changing the leaving group from Cl- to...
- Q Explain the basis for the stacking gel portion of apolyacrylamide gel. Describe how it works with respect to theloaded protein samples as well as the running buffercomponents.
- Q Apparently a shark can smell blood up to a quarter of a mile away.How does smell travel in water? It would seem strange that if youdrop ink in water it...
- Q 3. Determine the pH (to two decimal places) of the solution thatis produced by mixing 5.05 mL of 7.91×10-5 M HI with7.73 mL of 8.38×10-5 M Mg(OH)2.
- Q Why is pyridine a good nucleophile for cleaving boraneprotecting groups from phosphanes?
- Q 29. How propyl amine can be synthesized by Gabriel Synthesis?Write the mechanism of the reaction.30. How reductive amination methodology can be applied for thesynthesis of the potent CNS drug “Amphetamine�31....
- Q a) The complete combustion of 10.0 g of solid naphthalenerequires what volume of oxygen gas at 20.0 oC and 1.00atm? How much heat energy will be transferred in this trial?Specify...
- Q Propane gas is used as a propellant in aerosol cans.a. Suppose a 455 mL container contains propane gas at a pressureof 1.75 atm at 25.0 oC. How many grams of...
- Q Al2(CO3)3 (s)è Al2O3 (s) + 3 CO2(g)          ∆H= +579kJ            a. What kind of chemical reaction is taking place? Is it endo-or exothermic? Explain how you know both answers.b. Predict the change...
- Q A1.00 liter container holds a mixture of 0.52mg of He and 2.05 mg ofNe at 25 degrees. Determine the partial pressures of He and Ne inthe flask. What is the...
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