Chemistry question and answers for August 17, 2023
- Q Select all of the following equations that would most likelygive a positive value for ΔS. -- How do youdetermine the value of ΔS just by a reaction???1. AgNO3 (aq) +...
- Q The rate consant for the reactionI+I+Ar---->I2+Aris 0.59 x 1016cm6mol-2s-1 at 293K. What is thehalf-life of I is [I]o= 2 x 10-5 molL-1 and [Ar]= 5 x 10-3 molL-1?
- Q 1) 65. mLs of water is added to 403 mLs of 2.39 M solution ofHCl. What is the new molarity of the solution?2) How much water must be added to...
- Q 1. A large quantity of chemical energy is stored in a gummybear, which is primarily sugar, C12H22O11. When a gummy bear isplaced in molten KClO3, the sugar is oxidized according...
- Q The sulfate ion level in a municipal water supply is given as46.0ppm .What is [SO2?4] in this water? in units M
- Q When comparing two enzymes against a single substrate it is bestto compare which of the following experimentally determinedvalues?kcatKmnone of theseVmaxk2
- Q Explain in detail the principles, mechanisms, andchemical structural features of electroconductive polymers.
- Q Assume that liquid water has a temperature-independent capacityof 75 J mol-1K-1, and that for the transitionbelow no heat is lost to the surroundings and the processes arereversible.a. Calculate the chnge...
- Q What is necessary for a bond to be considered polar?What is necessary for a molecule to be polar?
- Q Assuming standard conditions, and considering the table ofstandard reduction potentials for half-reactions, given in yourtext, rank the following species according to their relativestrength as reducing agents. For example, the most...
- Q (a) A standard iodine solution was standardized against a 0.4123g primary standard As4O6 by dissolving the As4O6 in a small amountof NaOH solution, adjusting the pH to 8, and titrating,...
- Q In a lab, we are required to make a 100ml solution that contain:54.30mg/L sodium salicylate, 0.020M FeCl3, 0.050 M HCl. I will alsoneed to create a blank solution that contains...
- Q A and B are for and ideal solution. Pure A has a vapor pressureof 84.3 torr, while pure B has a vapor pressure of 41.2 torr. Themole fraction of A...
- Q a) Determine the molar solubility of Fe(OH)3 in pure water. Ksp= 2.79 × 10-39 for Fe(OH)3.(b) Determine the molar solubility of Fe(OH)3 if the pH of thesolution is 8.0.(c) Determine...
- Q How much heat is evolved in converting 1.00 mol of steam at155.0 ∘C to ice at -55.0 ∘C? The heat capacity of steam is 2.01J/(g⋅∘C) and of ice is 2.09...
- Q 5.0 mL 1.0 M NaOAc + 28.0 mL 1.0 M HOAcpH= 3.68Calculations:1. [H+] =?2. [OAc-]=?3. [HOAc]=?4. Ka=?
- Q Part AWhich of these weak acid solutions has the greatest percentionization?Which of these weak acid solutions has the greatest percentionization?SubmitHintsMy AnswersGive UpReview PartPart BWhich solution has the lowest (most acidic)...
- Q Do the calculations for the titration of 50.00 mL of a 0.1000 Msolution of H2SO3 with a 0.2000 M solution ofNaOH. Calculate the pH after the addition of 0.00, 12.50,...
- Q Calculate the pH of a 0.368 M solution of ethylenediamine(H2NCH2CH2NH2). The pKa values for the acidic form ofethylenediamine ( H3NCH2CH2NH3 ) are 6.848 (pKa1) and 9.928 (pKa2).Calculate the concentration of...
- Q Please show all work and derivationsA \"barrel of oil\" in international trade has a volume of 42 USgallons, or 159 L. How much heat would be released if 159 L...
- Q 5. According to your experimental results, how much vitamin Cwould you get from a 4 oz. (120 mL) serving of fresh orangejuice?a. Less than the RDA.b. More than the RDA.c....
- Q How many acetyl CoA molecules are formed when 1 molecule ofmyristic acid (14:0) is broken down?1467828
- Q A compound has an M+ ion at 102 amu. There is no M+2 peak. Theonly IR absorbances in the interpretable region are at 3500 and2900 cm−1. The 13C NMR spectrum...
- Q Howdo these common analytical techniques work, and what do they tellyou?A) mp determinationB) bp determinationC) PolarimetryD) thin layer chromatographyE) gas chromatography
- Q 1. Exercise 11.79A gas mixture contains 74% nitrogen and 26% oxygen.If the total pressure is 1.18 atm what are the partial pressuresof each component?Express your answers using two significant figures....
- Q Calculate the percent ionization of hypobromous acid (HBrO) insolutions of each of the following concentrations (Ka = 2.5e-09.)(a) 0.263 M (b) 0.477 M (c) 0.868 M
- Q Need molecular & net ionic equations for the followingSulfuric acid + potassium phosphateSulfuric acid + lithium sulfateSulfuric acid + magnesium nitrateSulfuric acid + sodium carbonateSulfuric acid + sodium hydroxideSulfuric acid...
- Q prepare .1M Sodium phospahte buffer, pH 6.8. you need 500ml.NaH2PO4-H20= 137.99g/molNa2HPO4-7H20= 268.08g/mol
- Q Properties of matterA metal crystallises in a face-centred cubic lattice.The edge ofthe unit cell is 286pm,and the density of the crystal is7.92gcm^-3.Calculate the atomic mass of the element?
- Q Consider the following gas-phase reaction: C6H6(g) 3 C2H2(g)Using data from Appendix C of your textbook calculate thetemperature, To, at which this reaction will be at equilibriumunder standard conditions (Go =...
- Q In the titration of 30.0 mL of a 0.200 M solution of ahypothetical compound NaH2M, what is the pH of the solution afterthe addition of 30.0 mL of 0.100 M...
- Q a thin circular-disk earning,5.00 cm in diameter is plated witha coating of gold 0.20 mm thick from an Au+3 bath.a) how many days does it take to deposit the gold...
- Q 1. mix 2.5 Ml cyclohexanone, 7.5g of KMnO4, 65 ml H2o in a roundbottom flask. Use steam bath and heat to 30 degree C. 2. Add 1 mlof 3M NaOH...
- Q Compare and contrast between the ionic addition and the freefadical addition of HBr to 1-butene.
- Q What are some of the key characteristics of unknown sample of anaqueous solution containing an ionic compound? Specific questions:1. Given that the cation is from Group 1A, what is the...
- Q where R=8.314 J/(mol⋅K), T is the Kelvintemperature, n is the number of moles of electronstransferred in the reaction, and F=96,485 C/mol e−.At 68.0 ∘C , what is the maximum value...
- Q What is the length (in cm) of an edge of a cube of gold (density= 19.3 g/mL) which has a mass of 19.92 kg?What is the length (in cm) of...
- Q Calculate the P values for which Br2(g) is in a correspondingstate to Xe(g) at 328 K and 73.2 bar .
- Q 1. Determine ΔGo for the following reaction:2 Na(s) + 2 H2O(l) --> H2(g) + 2OH-(aq) + 2 Na+(aq)2. Calculate K for the oxidation of iron by H+:2 Fe(s) + 6...
- Q Explain post precipitation with examples what is the remedy of thisproblem ?
- Q Explain the meaning of the three assumptions for theMichaelis-Menten kinetics. Express each assumption in mathematicalterms.
- Q How does the Al:Si ratio affect the chemistry of thezeolite?What are nitrogen isotherms, and what information does oneobtain from them?
- Q Assume you are performing the calibration step of Experiment 8and you begin with 20 g of water at 20 oC and 20 g of water at 80oC. After adding the...
- Q The Tesla Powerpack lithium ion battery storage system has thefollowing specifications:Installed Capacity – 50 KWStorage Capacity – 210 KWhOutput voltage – 480 VOverall efficiency – 89%1. How long (in hours)...
- Q consider the following system at equilibrium:SiF4 (g) + 2H2O + heat 《》SiO2 (g) + 4HF (g)a. Is this reaction endothermic or exothermic?b Which direction will the equilibrium shift if HF...
- Q The emission of NO2 by fossil fuel combustion can be preventedby injecting gaseous urea into the combustion mixture. The ureareduces NO (which oxidizes in air to form NO2) according to...
- Q Determine the formula weight, number of molecule and number ofmoles1). 1.7293 x10^16 Molecules of H2O2). 5.699 g of BaSO4
- Q Howwill you manage the crop if the soil is deficient in P?
- Q Part A24195Am→23793Np+_____ Express your answer in isotopicnotation.Part B_____+0−1e→12655Cs Express your answer in isotopic notation.Part C23793Np→_____+42He Express your answer in isotopic notation.Part D21885At→_____+42He Express your answer in isotopic notation.
- Q f 2.0 moles of octane vapor, C8H18, is reacted with 15 moles ofoxygen to produce carbon dioxide and water, what are the partialpressures of all gases in the mixture at...
- Q Pentane (C5H12), when it burns, generates heat according tothe following:​C5H12 + 8 O2 → 5 CO2 + 6 H2O + 3509 kJ of heat energya) The molar mass of pentane...
- Q Hello. Question:I have absorption data collected from 5 samples of the sameenzyme at different concentration. The data is collected over theinterval of 3 minutes. How can I convert this into...
- Q Consider the titration of 70.0 mL of 0.0300 MCH3NH2 (a weak base; Kb =0.000440) with 0.100 M HNO3. Calculate the pH after thefollowing volumes of titrant have been added:(a) 0.0...
- Q A 5.00 mL volume of a 0.60 M solution of phosphoric acid,H3PO4(aq), reacts with 45.00 mL of 0.25 M NaOH(aq) according to thereaction below. The temperature of the solution rises...
- Q which of following statement is true of nuclear fusiona. the mass of the products is greater than the mass of thereactant, and energy is absorbedb. the mass of the products...
- Q The vinegar sold in the grocery stores is described as 5.0%(V/V)acetic acid?What is the molarity of this solution (density of 100% aceticacid is 1.05 g/mL)?What is the mass % of...
- Q Compare and contrast scanning tunneling microscopy (STM) andatomic force microscopy (AFM)? List at least two advantages and twodisadvantages for both methods. Please reference at least onesource in your discussion. (It...
- Q Chlorine can be prepared in the laboratory by the reaction ofmanganese dioxide with hydrochloric acid, HCl(aq), as described bythe chemical equationMnO2(s)+4HCl(aq)⟶MnCl2(aq)+2H2O(l)+Cl2(g)How much MnO2(s) should be added to excess HCl(aq) to...
- Q Each of the isomers can be formed, but 4-methylcyclohexene isthe major product formed. Why?
- Q Substance H has maximum absorbance at 550 nm; SubstanceM has maximum absorbance at650 nm. A standard solution of H has a concentration 74.2 ppm andan absorbance of 0.972 at500 nm...
- Q what period three element has the following ionizationenergies? (all in kj/mol)IE1=1012, IE2=1900, IE3=2910, IE4=4960, IE5=6270, IE6=22,200
- Q Describeclearly how you would apply the concepts of pH control of naturalwaters and redox chemistry to precipitate or remove dissolvedmetals from acid mine water. Explain how pH and redox potential...
- Q howreduced NADH and FADH2 feed into the electron transport chain todrop off electrons and H+.
- Q ***Please show ALL work and explain***If 2.000 g NaHCO3 and 2.0 mL HCl (density = 1.18 g/mL) arereacted to yield 1.100 g NaCl, what is the theoreticaal and percentyield of...
- Q Compare the methods of capillary electrophoresis andhigh performance liquid chromatography HPLC. For each method, givean example of when it would be more advantageous than the otherone.
- Q Iron(III) oxide reacts with carbon monoxide according to theequation:Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)A reaction mixture initially contains 22.90 g Fe2O3 and 15.78 gCO.Once the reaction has occurred as completely as possible, whatmass (in g)...
- Q 1.a) If ΔE > 0 then energy is being absorbed by thesystem.TrueFalse1.b) If ΔEsystem is positive thenΔEsurrounding must be:negativenone of thesepositivezero1.c) Consider the following chemical equation and calculate howmuch heat...
- Q A silver block, initially at 55.4 ∘C, is submerged into 100.0 gof water at 24.0 ∘C, in an insulated container. The finaltemperature of the mixture upon reaching thermal equilibrium is27.8...
- Q Urea (CH4N2O) is a common fertilizer that can be synthesized bythe reaction of ammonia (NH3) with carbon dioxide as follows:2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l) In an industrial synthesis ofurea, a chemist combines 120.6 kg...
- Q A hot lump of 43.0 g of iron at an initial temperature of 62.6°C is placed in 50.0 mL of H2O initially at 25.0 °C and allowed toreach thermal equilibrium....
- Q You are studying the reaction of iodine with a ketone toproduce iodoketone with the following equation:           I2 + ketone → iodoketone + H+ +I-Data for initial rates and concentrations are given...
- Q The half life of14C is 5730 years. Whatfraction of the 14C nuclei in a sample are left after 8140years?
- Q Using the equation:Â Â Â Â Â 2NOÂ Â Â Â +Â Â Â Â O2Â Â Â Â Â Â Ã Â Â Â 2NO2Determine the limiting reactant if given 1.0 mol NO and 1.0 molO2Determine the limiting reactant if given 4.2 mol NO and 2.0 molO2Determine the...
- Q An aqueous solution is made by dissolving 21.2grams of ammonium phosphate in323 grams of water.The molality of ammonium phosphate in the solutionis ? m.In the laboratory you are asked to...
- Q explain whether it is possible to determine the approximateconcentration if a solution of that sample has an absorbance of0.62
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