Chemistry question and answers for October 08, 2023
- Q A voltaic cell is constructed that is based on the followingreaction:Sn2+(aq)+Pb(s)→Sn(s)+Pb2+(aq).Part A If the concentration ofSn2+ in the cathode compartment is 1.50 M and the cell generatesan emf of 0.18...
- Q calculate the energy of red light with a wavelength of 703.2nm
- Q Complete and Balance:a. Fe3+ + NH3OH+ =Fe2+ + N2b. Fe3+ + NH3OH+ =Fe2+ + N2Oc. Fe3+ + NH3OH+ = Fe2+ +NOd. Fe3+ + NH3OH+ =Fe2+ + NO2e. Fe3+ + NH3OH+...
- Q According to the hard and soft acid and bases indicate witharrow the direction of the favored reaction ,balance the equationand indicate which is a harder or softer acid and harder...
- Q Complete the following table of data forCe2(SO4)3 · 9 H2O.(Assume the density of water is 1.00 g/mL.)T (°C)Solubility(g/100. g)Concentration(M)Ksp?G(kJ/mol)27.09.27____________34.07.82____________41.06.54____________48.05.45____________55.04.54____________62.03.81____________69.03.26____________Use a graph of ?G vs. T to determine the following. (Enter...
- Q How much energy (in kilojoules) is released when 30.5g ofethanol vapor at 97.5?C is cooled to -16.5?C? Ethanol has mp =-114.5 ?C, bp = 78.4 ?C, ?Hvap = 38.56 kJ/mol...
- Q EDTA is a hexaprotic system with the following pKa values: pKa1= 0.00 pKa4 = 2.69 pKa2 = 1.50 pKa5 = 6.13 pKa3 = 2.00 pKa6 = 10.37The distribution of protonated...
- Q 6. What is an addition reaction?a. What type of starting materials are used for addition reactions?(functional group)b. What type of reagents are used for addition reactions?
- Q 250 gallons of water (at 25 degrees Celsius and 1 atmosphericpressure) are boiled to power a steam engine. The heat source toboil the water is the combustion of methanol according...
- Q 1) Glucose has molecular formulaC6H12O6.a) Draw the three distinct forms of glucose that exist inequilibrium in solution.b) What is the term used to describe the inter-conversion of thethree forms of...
- Q Ionization energy is the energy needed to eject an electron froman atom or ion. Calculate the ionization energy, IE, of theone-electron ion Be3 . The electron starts in the lowest...
- Q Refer to this table of reduction potentials to answer thequestions. Reduction half-reaction Potential (V) F2(g)+2e−→2F−(aq)+2.87 O2(g)+4H+(aq)+4e−→2H2O(l) +1.23 Br2(l)+2e−→2Br−(aq) +1.07Ag++e−→Ag(s) +0.80 2H2O(l)+2e−→H2(g)+2OH−(aq) −0.83Na+(aq)+e−→Na(s) −2.71 What is produced at each electrode in...
- Q A 25.0mL of 0.152M H2SO4 was reacted with 20.0mL of0.410 M NaOH.Calculate the concentration of the salt that is formed during thereaction as well as the concentrations of H2SO4 and...
- Q what is the purpose of a sandmeyer reaction (to get4-chlorotoluene )
- Q Predict a likely mode of decay for each of the followingunstable nuclides.Rh-92: beta decay or positron emissionGa-60: beta decay or positron emissionS-27: beta decay or positron emission
- Q Give 5 manifestations of the kinetic molecular theory or of gaslaws in your every day life. For example, why does the low tirepressure warning light in your car turn on...
- Q I need to find the total and netionic equations for the following reactions:Thank you so extremely much inadvance.HCl (aq) + Al (s)Fe(s) + HCl (aq)Mg(s) + HCl (aq)Zn(s) + HCl...
- Q At 1000 K, the value of Kc = 0.032 for thereaction:C(s) + H2O(g) ⟺CO(g) + H2(g)Calculate the equilibrium concentrations of H2O, CO,and H2 in a reaction mixture obtained by heating...
- Q You can purchase nitric acid in a concentrated form that is70.3% HNO(3) by mass and has a density of 1.41 g/mL. Describeexactly how to prepare 1.15 L of 0.100 M...
- Q A sample of mixture of FeSO4.(NH4)2So4.6H2O and inert materialis dissolved in water, and the Fe is oxidized with bromine water.The excess Br2 is boiled out and NH4OH is added to...
- Q At a certain temperature, the equilibrium constant, Kc, for thisreaction is 53.3.H2(g) + I2 (g) ---> 2 HI (g)Kc= 53.3At this temperature, 0.600 mol of H2 and 0.600 mol of...
- Q acetone and methanol form ideal solution. at 25 degree C thevapor pressure of pure acetone and pure methanol is 0.342 atm and0.188atm respectively. calculate the mole fraction of methanol in...
- Q Fuel tanks for barbecues contain propane and n-butane. At 120oF,in an essentially full tank of liquid that contains liquid andvapor in equilibrium and exhibits a pressure of 100 psia, what...
- Q The Separation of Three Organic Compounds by Acid, BaseReactions and Liquid, Liquid Extraction. Okay, so we had solidbenzoic acid, ethyl 4- aminobenzoate, and 9-fluorenone alldissolved in diethyl ether. We separated...
- Q in a certain operation 3.54*104 kg of Ticl4 isreacted with 1.13*104 kg of MgA) Calculate the theoretial yield of titanium , Ti inkilograms.B ) Calculate the percent yield if 7.91*103...
- Q Calculate ?G
- Q Write the equations for the reaction of the following Bronstedacids with water:(a) HCO2H (b) NH3OH+ (c) HClO4Write equations for the reactions of the following Bronstedbases with water:(a) C H NH...
- Q Should Toluene have reacted with Sulfuric Acid, KMnO4, and 2%Bromine? Reaction?I performed these tests in the lab but got negative results forall three. I think I didn't shake them enough...
- Q Complete combustion of methaneWhen methane (CH4CH4) burns, it reacts with oxygen gas toproduce carbon dioxide and water. The unbalanced equation for thisreaction isCH4(g)+O2(g)→CO2(g)+H2O(g)CH4(g)+O2(g)→CO2(g)+H2O(g)This type of reaction is referred to as...
- Q In 0.100 M CH3NH2, only 6.4% of the base has undergoneionization. Calculate the pKb of methylamine.The answer is 3.36 but I have no idea how to get it. Please showsteps....
- Q i. NIST-traceable standard metal ion solutions are provided. Thestandard metal ion solutions are each 1000 ppm. Compute how much ofthe NIST-traceable solution you will use to prepare 100 mL of...
- Q A 1.000 gram organic sample containing nitrogen is subjected toKjeldahl analysis. The ammonia gas generated when ammonium isneutralized is distilled into 50.00 mL of 0.1000 M HCl to reformammonium. If...
- Q Solvent vessels must be purged before maintenance personnelenter in order to ensure that: (1) sufficient oxygen is availablefor breathing; (2) vapor concentrations are below the flash point;(3) vapor concentrations are...
- Q Aqueous hydrochloric acidHClreacts with solid sodium hydroxideNaOHto produce aqueous sodium chlorideNaCland liquid waterH2O. If0.314gof water is produced from the reaction of0.73gof hydrochloric acid and1.3gof sodium hydroxide, calculate the percent yield...
- Q A.) Calculate the pH of 1.0 L of the solution, upon addition of49.00 mL of 1.0 MHCl.Calculate the pH of the solution upon addition of 19.1 mL of1.00 MHCl to...
- Q 1. The equilibrium constant, Kp, for the followingreaction is 10.5 at 350 K:2CH2Cl2(g)<--->CH4(g) +CCl4(g)Calculate the equilibrium partial pressures of all species whenCH2Cl2(g) is introduced intoan evacuated flask at a pressure...
- Q VOLUME TECHNIQUE: This method is based on the volume of carbondioxide produced and collected.MASS TECHNIQUE: This method is based on the difference in massbefore and after the reaction.The mass of...
- Q Briefly explain what you would observe if you used the testdescribed in (a) on a solution that needed more NaOH solution
- Q A 39.0%/61.0% by volume propane/n-butane mixture is cooled from291°C to 115°C. Assume ideal behavior.a) What is the average molar mass of the mixture?b) What is the change in specific enthalpy...
- Q Rank each substance above from strongest to weakestintermolecular force. Do not look up these substances' physicalproperties...determine the ranking based on general intermolecularforce principles. If you predict an \"anomaly\" (i.e. a...
- Q Identify major classes of biomolecules and characteristicfunctional groupsDraw the structure of water molecules including atoms, orbitalhybridization, bonds, lone pairs, partial charges, and dipolemoments
- Q Suppose we add 0.001M glucose to one side of an osmometer and0.001M hemoglobin to the other side. Will the water change? Why orwhy not?
- Q Match the following aqueous solutions with the appropriateletter from the column on the right. Assume complete dissociationof electrolytes.1.0.11 mFe(CH3COO)3A.Lowest freezing point2.7.8×10-2 mFe2(SO4)3B.Second lowest freezing point3.0.18 mNaIC.Third lowest freezing point4.0.33 mSucrose...
- Q How would you use a DEPT spectrum and a{1H}13C spectrum to deduce how manyquaternary carbon atoms you have?
- Q Write the combustion reaction for uracil (C4H4N2O2 (s)) andcalculate the standard enthalpy for the combustion reaction ofuracil at 298.15 K, using only the standard formation enthalpiesfor uracil (s), CO2 (g)...
- Q What is the hydroxide-ion concentration in a 0.20 Msolution of Na2CO3? For carbonic acid,Ka1 = 4.2
- Q Use the general integral balance equation to derive anintegral balance equation for the concentration, c, of somesubstance that diffuses through boundaries of the control volume.The substance may also be produced...
- Q draw the structure of LDA and explain 2 reasons why it is wellsuited to act as a base for the formation of an enolate
- Q Explain the proper techniques for cleaning the NMR tubes.Explain NMR and IR spectroscopy and what can be gained from bothindividually to analyze an unknown sample. Explain and showwork.
- Q A chemist prepared a solution by dissolving 52.0 g of hydratedsodium carbonate in water to a total volume of 5.00 dm3. Theconcentration was determined to be 0.0366 M. Determine the...
- Q Consider the following reaction and associated equilibriumconstant:aA(g)+bB(g)⇌cC(g),Kc = 4.0Find the equilibrium concentrations of A, B, and C fora=1, b=1, and c=2. Assume that theinitial concentrations of A and B are...
- Q Enzyme X is a highly pigmented protein that imparts thecharacteristic color to certain blue-green algae. It alsofacilitates a reaction necessary to the survival of this species;we can follow the kinetics...
- Q Consider the reaction: 2HCl(aq) + Ba(OH)2(aq) ! BaCl2(aq) + 2H2O(l) deltaH = \"118 kJA) Calculate the heat produced when 700.0 mL of 0.500 M HCl ismixed with 300.0 mL of...
- Q Error Analysis Questions:1. Assuming the magnesium ribbon wasn't sufficiently polished toremove a coating of magnesium oxie on the surface. How would thisaffect the volume of hydrogen gas produced? Would this...
- Q Balance the following redox equation in acid:MnO4- + SCN- --> SO4^2- + CN- + Mn^2+
- Q Weak diprotic acid H2A is titrated with 0.2000 MNaOH. The initial concentration of H2A is 0.1000 M andthe initial volume is 50.00 mL.     Ka1 = 1.0 x 10−5     Ka2 = 1.0...
- Q - A 0.171 M weak acid solution has a pH of 4.34. Find Ka for theacid.- Find the percent ionization of a 0.230 M HC2H3O2solution. (The value of Ka for...
- Q What are control rods and what two elements are used to make rodsin nuclear reactors?
- Q Polyglycine, a simple polypeptide, can form a helix with ϕ=−80∘ ,ψ=+150∘ . From the Ramachandran plot (see the figure on the left),describe this helix with respect to handedness.Check all that...
- Q please show workAn industrial chemist introduces 2.0 atm of H2 and2.0 atm of CO2 into a 1.00−L container at 25.0°C andthen raises the temperature to 700°C, at whichKc = 0.534:H2(g)...
- Q #9 Writing and Interpreting a Rate Law Expression1. The gas phase reaction of nitric oxide and oxygen yieldsnitrogen dioxide:2 NO (g)Â Â +Â Â O2 (g) ----> 2NO2 (g)The rate law is...
- Q Formic acid (HCO2H) is an organic acid secreted by ants andstinging nettles.Calculate the pH in 0.21M HCO2H (Ka=1.8
- Q Solve an equilibrium problem (using an ICE table) to calculatethe pH of each of the following solutions.A. a mixture that is 0.15M in HF and 0.15M in NaFB.0.15M NaFC. 0.15M...
- Q 8. Draw a flow diagram for this experiment. Indicate which phasecontains each of the compounds in the mixture.10. Why is it essential to carefully separate the layers duringan extraction? What...
- Q at 25 C, a solution is prepared by adding 50 ml of 0.2 M NaOH to75 ml of 0.1 M NaOH. What is the total concentratoin of hydorxideion in the...
- Q 2H2S(g)<---> 2H2(g) + S2(g)The value of Kc for the thermal decomposition of hydrogensulfide is 2.2x10^-4 at 1400 K. A sample of gas which [H2S]=4.60 Mis heated to 1400 K in...
- Q Write the dissociation reaction for the following acidsin water H2O. State whether the acid isa strong acid or a weak acid. Is the reaction reversible? Identifythe acid, base, conjugate acid,...
- Q a hydrogen atom in the ground state absorbs a photonof light with a wavelength of 97.3nm causing the electron to jumpto an unknown energy level. the electron then relaxes emitting...
- Q A pediatrician orders Cephalexin 12.5 mg/ kg by mouth (po) every12 hours (bid). The child weighs 33 pounds (lbs). The pharmacistprovides you with Cephalexin oral suspension 100 mg/mL. How manymilliliters...
- Q Using 1.8*10^-5 for the Ka for acetic acid, along with theweight of sodium acetate and volume of acetic acid used to preparea buffer, calculate the expected pH of the buffer.So...
- Q Consider the dissociaton of methane, into the elements H2g andC(s) givena) the change of enthalpy of reaction is -74.85 kJ/mol andchange of entropyof reaction is -80.67 J/mol K at 298K....
- Q Many different ways have been proposed to make batteries. Onecell is set up with copper and lead electrodes in contact withCuSO4(aq) and Pb(NO3)2 (aq), respectively. If the Pb2+ and Cu2+concentrations...
- Q . Consider the following reduction-oxidation “skeletonâ€equation,Br2(l) = BrO3 ‒ (aq) + Br‒ (aq)a. Write a balanced equation for the reduction-oxidationreaction that occurs in basic solution.b. Using your balanced equation, identify...
- Q Q.N.2) A portion of a specicific DNA molecule consists of thefollowing sequence of nucleotide triplets:TACÂ Â Â GAAÂ Â Â Â CTTÂ Â CGGWhat is the DNA sequence codes for this terapeptide?
- Q How many oxygen atoms are present in 373 g of mannose,C6H12O6?
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