Chemistry question and answers for October 02, 2023
- Q For each of the following write the correct chemical formula,predict the products, write the molecular, total ionic equation,and net ionic equations. Include states of matter in equations.Sulfuric acid + barium...
- Q Document all aspects of the 1D PIAB. Show the first five energylevels. Try your best to draw to scale. Include the wavefunctions,energy levels,and the impact of the uncertainty principle on...
- Q Select the statements below that are false andthink about why they are not true. a) If a chemical reaction isspontaneous then the ?Ssys must always be positive. b)If a chemicalreaction...
- Q A proposed mechanism for the preparation of COBr2from CO(g) and Br2 is:Br2 ⇄ 2 Br (g) fastBr(g) + CO (g) ⇄ COBr fastCOBr + Br2 → COBr2 + Br slowThe...
- Q If 2.46 g of Ar are added to 2.75 atm of He in a 2.00 L cylinderat 27.0
- Q 2) Solid aluminum and gaseous oxygen react in a combinationreaction to produce aluminum oxide: 4Al (s) + 3O2 (g) → 2Al2O3 (s)In a particular experiment, 5.0 g of Al reacts...
- Q How many liters of 0.983 M LiOH will be needed to raise the pHof 0.129 L of 5.75 M sulfurous acid (H2SO3)to a pH of 6.653?
- Q Reaction 1: Cu(s) + AgNO3 (aq) = CuNO3 (aq) + Ag (s)Reaction 2: Cu (s) +AgNO3 (aq) = Cu(NO3)2 (aq) + Ag (s)Part 1: Write the balanced net ionic equations...
- Q Acetylene, C2H2 (boiling point = –84°C),is produced by the reaction of solid calcium carbide,CaC2, and liquid water. Calcium hydroxide solution isthe other product of the reaction. 127 kJ of energy...
- Q A 65.0 mL sample of 1.0 M NaOH is mixed with 48.0 mL of 1.0 MH2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lidthrough which...
- Q Sort the following reactions or processes based on whether theyuse energy from adenosine triphosphate (ATP), or produce energy tostore as ATP. Drag the appropriate items to their respective bins.anabolic reaction,...
- Q a) Which of the following reactions occur when (E,Z,E)-octa-2,4,6-triene is heated? Circle your choice:- Diels-Alder-Cycloaddition- Cope rearrangement-Electrocyclic-Sigmatropicb) Sketch the MAJOR product that is formed when(E,Z,E)-octa-2,4,6-triene is heated. Be sure clearly...
- Q Calculate ?Ho,?S0,?G0 (25.0oC)for the formation of sulfur trioxide from oxygengas and sulfur dioxide ;Wtite balance equation and show all units, substances in yourequation.SubstanceEnthalpy value (Kj/mole)Entropy value(J/K-mole)Sulfur dioxide gas-300250Sulfur trioxide gas-395260Oxygen...
- Q What is the pH of a solution formed when 42.0mL of 0.120 M NaOHis added to 50.0mL of 0.120 M CH3COOH? (Ka= 1.8x10^-5)
- Q 1). Why do some oxygen containing hydrocarbons form hydrogenbonds and others do not?2). A functional group R would attatch itself to which carbon ofan n-propyl group?
- Q 2. Describe how you would prepare 100ml of 0.08 M sulfuric acid[H2SO4] from an 18 M concentrated sulfuric acid stock solution.3. Describe how you would prepare 50 ml of 0.2...
- Q a) How many grams of hydrogen gas (H2) is produced by thedecomposition of 43.7g of ammonia gas (NH3)?b) If 12.0 moles of H2 were produced, how many grams of NH3...
- Q 1. a) What is the net ionicequation for ZnSO4 + H2O?b) Is the solution acidic or basic?c) Which ion, Zn2+ or SO42-, iscausing the observed acidity or basicity?2. What is...
- Q How do you find the lattice energy of ionic compounds?
- Q Calculate [OH -] and pH for each of the followingsolutions.(a) 0.0043 M KOH[OH-] = _____Â Â MpH = 11.63(b) 0.0341 g of CsOH in 540.0 mL of solution[OH -] = 4.21e-4Â Â MpH =...
- Q Determine the pH of a 0.046 M iodous acid (HIO2) solution.Iodous acid is a weak acid (Ka = 3.2 ✕ 10−5 M).
- Q Complete and balance the following equation:S(s)+HNO3(aq)→H2SO3(aq)+N2O(g)(acidic solution)Express your answer as a net chemical equation includingphases.Complete and balance the following equation:BrO3−(aq)+N2H4(aq)→Br2(l)+N2(g)(acidic solution)Express your answer as a net chemical equation includingphases.Complete and...
- Q 9.537 g of a non-volatile solute is dissolved in 220.0 g ofwater.  The solute does not react with water nor dissociate insolution.  Assume that the resulting solution displays ideal Raoult's lawbehaviour.  At 25°C...
- Q Consider the following equilibrium:Fe(OH)3(s) D Fe3+(aq) +3OH–(aq) with Ksp = 1.6 x10-39. The activity coefficients forFe3+(aq) and 3OH–(aq) are0.445 and 0.900 in a solution with an ionic strength of 0.01M....
- Q Hydrogen gas can be produced by the reaction of iron metal withsteam, as shown in the equation below:3 Fe (s) + 4 H2O (g) Ã Fe3O4 (s) + 4 H2...
- Q calculate the mean ionic activity of a 0.0350 m Na3PO4 solutionfor which the mean activity coeffiecient is 0.685.Answer should be: 0.0547Please show me how to get there. Thank you
- Q Isolation of Nicotine from Tobacco1. Why did you add 5 mL of 3 M NaOH to the mixture prior to thesteam distillation?2. How can you tell when steam distillation is...
- Q Mix the watery environment of Elodea with a pHindicator called phenol red. In the presence of an acid, phenol redwill appear yellow. In the presence of a strong base, phenol...
- Q Which compound is likely to have an incomplete octet? H2S PH3 NOSF6
- Q Rewrite the net ionic reaction. If there is NO reaction, simplywrite NR.1) (CuSO4 + NaOH)2) (AlCl3 + NaOH)3) (Zn(C2H3O2)2 +NaOH)4) (Pb(NO3)2 + NaOH)5) (Na3PO4 + NaOH)6) (AlCl3 + Na3PO4)7) (CuSO4...
- Q how many times does a reaction speed up if the T rises from10*C to 40* C?
- Q If a reduction reaction uses 0.50 g of camphor and has a(2.72x10^1) % yield of borneol and isoborneol, how many g'sisoborneol does it produce? Refer to the previous question(s) forMW...
- Q You have a cold gas of gold atoms, and you observe that if youshine light consisting of photons with energy 10.2 eV through thegas, some free electrons are observed, implying...
- Q The rate of reaction is defined asRate = −1∆[A] = −1∆[B] = + 1∆[C] = +1∆[D] ?? ∆?? ?? ∆?? ?? ∆???? ∆??Average rate: the change in measured concentrations in...
- Q Rewrite the net ionic reaction. If there is NO reaction, simplywrite NR.1) (Na2CO3 + Kl)2) (AgNO3 + Kl)3) (CuSO4 + AgNO3)4) (AlCl3 + AgNO3)5) (Zn(C2H3O2)2 +AgNO3)6) (Pb(NO3)2 + AgNO3)7) (Na3PO4...
- Q The literature value for the Ksp of Ca(OH)2 at 25 °Cis 4.68E−6. Imagine you ran the experiment and got a calculatedvalue for Ksp which was too high. Select all of...
- Q When 15.0 mL of a 7.02×10-4 M ammonium fluoride solution iscombined with 22.0 mL of a 9.63×10-4 M magnesium sulfate solutiondoes a precipitate form? (yes or no) For these conditions...
- Q A solution of an unknown acid is prepared by dissolving 0.250 gof the unknown in water to produce a total volume of 100.0 mL. Halfof this solution is titrated to...
- Q Describe the meaning of the molecular equation between the NaOHand HCl solutions on the microscopic and macroscopic scales.Provide a detailed description for titrating the calculatedvolume of HCl solution with the...
- Q Please show all workA.)Place the following in order of decreasing standard molarentropy.NaCl(s) Na3PO4(aq) NaCl(aq)a.NaCl(aq) > Na3PO4(aq) >NaCl(s)b.NaCl(aq) > NaCl(s) >Na3PO4(aq)c.Na3PO4(aq) > NaCl(aq) >NaCl(s)d.NaCl(s) > NaCl(aq) >Na3PO4(aq)e.NaCl(s) > Na3PO4(aq) >NaCl(aq)B.)Calculate the...
- Q Which of the subshell designations are possible and which areimpossible?PossibleImpossible4f2d4d1p3fAnswer Bank
- Q A 0.4592 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO 2 â‹… 4 H 2O and removed by filtration. The...
- Q Calculate E?cell for each of the following balancedredox reactions.A.O2(g)+2H2O(l)+4Ag(s)?4OH?(aq)+4Ag+(aq)B.Br2(l)+2I?(aq)?2Br?(aq)+I2(s)C.PbO2(s)+4H+(aq)+Sn(s)?Pb2+(aq)+2H2O(l)+Sn2+(aq)D. Determine whether the reaction in part A is spontaneous aswritten.E. Determine whether the reaction in part B is spontaneous aswritten.F. Determine...
- Q Predict the sign of the entropy change for each of the followingprocesses and give your reasoning why:1. Solid sugar is added to water to form a solution.2. Iodine vapor condenses...
- Q KClO3 disproportionates on heating to give KCl andKClO4 only. The number of moles of KClO4produced on complete disproportionation of 24.5 g KClO3isA. 0.156B. 0.106C. 0.126D. 0.206E. 0.056
- Q Assume a titration with 0.100 M NaOH titrant and 25.00 mL of a0.0800 M CH3COOH analyte. What will the pH of the analyte be if10.00 mL of NaOH is added?
- Q nstant cold packs sometimes used to treat athletic injuriescontain solid ammonium nitrate and liquid water separatedbya thindivider. When the divider is broken, the ammonium nitrate dissolvesendothermically:NH4NO3(s) ïƒ NH4+(aq) + NO3–(aq)To measure...
- Q Nitrogen gas is compressed isothermally at 250K from 1.0 bar to150 bars. Determine the change in enthalpy and entropy using:a. Redlich-Kwong equation of stateb. Using tabular superheat data
- Q Using standard Gibbs energy of formation values given in thetable, calculate the equilibrium constant K of thereactionCl2(g)+2NO(g)⇌2NOCl(g)The standard Gibbs energy change of the reaction represents thedrive the reaction has under...
- Q How many grams of O2 can be prepared from the thermaldecomposition of 4.09kg of H2O
- Q A student mixes 5.00 mL of 2.00 x 10â€3 M Fe(NO3)3 with 5.00 mL2.00 x 10â€3 M KSCN. She finds that in the equilibrium mixture theconcentration of FeSCN+2 is 1.40...
- Q Titration: calculate (a) the initial pH, (b) the volume and thepH at 1/3 of the equivalence point, (c) the volume and the pH at2/3 of the equivalence point, (d) the...
- Q Consider the following unbalanced redox reactionCrO42- + (CH3)H + H+→ Cr3+ + HCOOH + H2OWhich of the following statements is/are correct?1.CrO42- is the oxidizing agent.2. The oxidation number of Cr...
- Q Count Valence e-FormulaElectron GeometryMolecular Geometry1 N = 53 H = 38 / 2 = 4 pairNH3TetrahedralTrigonal pyramidalH2OCBr4SO3 This is not apolyatomic ion …No charge!!!PI3CH3Cl Carbon is the central atomNO31-CO32-NH4+1CH4SO2
- Q Juice is put into bottles and sealed. Each bottle contains 1500mL of product and has 65 mL headspace of air with 20% by volume ofoxygen in it. The specific gravity...
- Q Producing polymers with high molecular weights is difficult instep polymerizations. Why is it difficult and which techniquesexist to overcome this difficulty?
- Q Calculate the pH of the solution that results from each of thefollowing mixtures.140.0mL of 0.26M HF with 220.0mL of 0.30M NaF
- Q Explain why ICP-MS is more sensitive than ICP-AES.
- Q From an evolutionary perspective, why does thefermentation pathway exist?Given that generating pyruvate gives net 2 ATPs, whatis the biochemical rationale for converting pyruvate tolactate?
- Q Determine the pH during the titration of 56.9 mL of 0.385 Mhydrofluoric acid (Ka = 7.2×10-4) by 0.385 M NaOH at the followingpoints.(a) Before the addition of any NaOH(b) After...
- Q When 50.0 mL of 60.0°C water was mixed in the calorimeter with50.0 mL of 25.0°C water, the final temperature was measured as 40.8°C. Assume the density for water is 1.000...
- Q A concentration cell based on the following half reaction at 312k ag+ + e- --------> ag srp = 0.80 v has initial concentrationsof 1.25 m ag+, 0.221 m ag+, and...
- Q As a chemist for an agricultural products company, you have justdeveloped a new herbicide,\"Herbigon,\" that you think has thepotential to kill weeds effectively. A sparingly soluble salt,Herbigon is dissolved in...
- Q How much heat in kilojoules is evolved in converting 2.00 mol ofsteam at 140 ∘C∘C to ice at -20.0 ∘C∘C? The heat capacity of steamis 1.84 J/g∘CJ/g∘C and that of...
- Q can get the answer for all these questions1. Calculate the pH in a solution that is 0.98 M in NaC2H3O2 and0.56 M in HC2H3O2. (Ka = 1.8 x 10–5)2. Given...
- Q How many grams ofNaH2PO4 and how many grams ofNa2HPO4 are needed to prepare 2.0 L of 1.50 M“phosphate buffer†with a pH of about 8.00.You are given:For salt form of...
- Q 1) If the Ka of a monoprotic weak acid is 2.1
- Q a) Does a precipitate form when 0.200 L of 0.15 MCa(NO3)2 is mixed with 0.100 L of 0.120 MNaF? At experimental temperature, Ksp of CaF2= 3.9 x 10-11b) Calcium hydroxide,...
- Q A mixture solution of Co(II) and Ni(II) shows an absorbance of0.500 at 500 nm. What percentage of incident light isabsorbed by the solution?Under the given conditions if 20% of the...
- Q Agas of unknown identity diffuses at a rate of 102 ml/sec in adiffusion apparatus in which a second gas with a molecular mass of66.0 diffuses at a rate of 83.3...
- Q An atom of an element weighs 5.88 × 10-23 g. What is the atomicmass of this element in atomic mass units?
- Q Calculate the weight of buffer needed to make 100 mL of a 0.1 Mbuffer of acetate (MW=136.1g/mol)
- Q A.020 L, .2 M lactic acid solution is titrated with .02 M potassiumhydroxide. find the ph at the .5 equivalence point and theequivalence point. ka is 1.4*10^-4. show all work...
- Q 1. When chromium metal is added to nitric acid, the followingreaction takes place Cr (s) + 6 HNO₃ (aq) → Cr(NO₃)₃ (aq) + 3 H₂O(l) + 3 NO₂ (g) Calculate...
- Q by comparing the instrumental design of a spectrophotometer andthe spectrofluorometer, why does the emission spectrum of the blankhave well defined peaks while the absorption spectrum is nearlyflat?(hint how do you...
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