Chemistry question and answers for September 28, 2023
- Q An adiabatic tank contains 120 kg of liquidwater initially at 70 °C. Thewater within the tank is utilized to quench (cool) a15 kg steel block initially at300 °C. The steel...
- Q The initial rates listed in the following table were measuredfor the reaction between nitrogen dioxide and carbon monoxide thatoccurs in engine exhaust.NO2(g)+CO(g)→NO(g)+CO2(g)NO2(g)+CO(g)→NO(g)+CO2(g)ExperimentInitial [NO2][NO2]Initial [CO][CO]Initial Reaction Rate (M/sM/s)10.1000.1005.00×10−35.00×10−320.1500.1001.13×10−21.13×10−230.2000.2002.00×10−22.00×10−2What is the value...
- Q A 0.4713 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to...
- Q How many liters of water have fallen on 1 hectare of land if 2.5inches of water fellduring a rain storm? Give your answer in the correct number ofsignificant digits
- Q Which of these has the lower concentration of hydrogen ions: 0.1M H2SO4, 0.1 M HCl, CaCO3, or pure water?
- Q Show with calculations whether a precipitate will form if: (a)30.0 ml of 0.0024 M AgNO3 is mixed with 70.0 ml of0.0036 M NaCl. (b) a solution that is 0.30 M...
- Q 1) Draw the skeletal structures of the 3 products formed fromCH4 and Cl in free radical reactions.1a) Draw the skeletal structure of the major monohalogenatedorganic product when cyclohexane reacts with...
- Q 1. A solution contains 1.43×10-2 Msodium phosphate and6.22×10-3 M potassiumhydroxide.Solid aluminum nitrate is added slowly to thismixture.What is the concentration of hydroxide ion whenphosphate ion begins to precipitate?[hydroxide] =  M2.A solution...
- 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. Starting with 500 g of N2 and 500 g of H2 how muchNH3 can you form? And how much of the excess reagent ( N2 or H2)remains (eg. is...
- Q ZnCl2 (aq) + Al (s) ---- Zn(s) + AlCl3 (aq)[Al3+] = 0.8 MÂ Â Â [Zn2+] = 1.3MZn2+(aq) +2e- ---Zn(s)Â Â Â -0.76VAl3+(aq) + 3e- --- Al (s)Â Â Â -1.66VBalance the equation above.Give the equation...
- Q A student seeks to neutralize 225mL of a 0.0369M sodiumbicarbonate solution by addition of 0.222M sulfuric acid solutionaccording to the following reaction: H2SO4(aq)+ NaHCO3(aq)--->Na2SO4(aq)+ H2O(l)+ CO2(g).A.) Classify the reactionB.) To...
- Q A student researcher performed a chromatographic separation ofcaffeine and aspartame with methanol as the mobile phase using aC–18 column. The retention times for methanol (tm) , caffeine (tc), and aspartame...
- Q if 17.058g of sodium chloride can be formed from 25 g NaNO3, isthe limiting reagent CuCI2 or NaNO3?
- Q Graphene has a C-C bond length of 1.42 Å.(a) Suppose you deposit a single layer of graphene around theentire earth, which has a diameter of 1.27 × 10^7 m. What...
- Q 97.8 grams of sodium fluoride is put into 350. ml ofwater.Calculate theMolarityMolalityMass PercentMole Fraction
- Q At35.0degrees, the vapour pressure of pure ethanol (C2H5OH) is100.0mmHg and the vapour pressure of pure acetone (CH3COCH3) is360.0 mmHga) a solution is formed from 25.0g of ethanol and 15.0g ofacetone....
- Q 1)In a batch culture, formic acid (HCOOH) is produced usingbacteria. For each mole of glucose (C6H12O6) utilized by thebacteria, 2.40 moles of cells (CH1.80O0.51N0.26), 1.70 moles offormic acid, 1.90 moles...
- Q 1) Suppose 500 mL of an 0.200 molar HCl acid is titrated with70.0 mL of a 1.00 M NaOH solution. What is the final pH of thesolution? The error interval...
- Q What is the appropriate equation for determining the standarddeviation of an analytical result from a calibration curve? Defineall symbols used.
- Q So i have my chemistry exam next week and this is a questionfrom the practice test. I am wondering more of the how/why for thisquestion than just the answer? How...
- Q If we mix 40.0 mL of 3.00 M Pb(NO3)2 (aq) with 20.0 mLof 2.00 x 10-3 M NaI (aq), does PbI2 (s) precipitate from solution?I yes, calculate how many moles...
- Q Write the mass balance equation of 0.01 M HCl that is inequilibrium with solid BaSO4.
- Q Given that the solubility constants of HgSO4 and PbSO4 are6.6x10-7 and 1.6x10-8 respectively, determine the cell potentialwhen the electrolyte is saturated with bothsalts at 298 K.
- Q The reaction 2NO(g) + Cl2(g) --> 2NOCl(g) obeysthe rate law rate = k [NO]2 [Cl2]. Thefollowing mechanism is proposed:NO (g) + Cl2 (g) --> NOCl2(g)NOCl2(g) + NO (g) -->2NOCl (g)a)...
- Q 1) Calculate the number of mL of water in 1.00 cubic feet ofwater.2) The radius of an AI atom is 0.143 nm. How many AI atoms wouldhave to be laid...
- Q A researcher was attempting to quantify the amount ofdichlorodiphenyltrichloroethane (DDT) in spinach with gaschromatography using a chloroform internal standard. To begin, theresearcher examined a sample containing 9.65 mg/L DDT standard...
- Q Express the result, taking into account the following:A three significant figuresWith the right unit1) 50.0 mL of a solution contains 0.0285 moles of AgNO3.Calculate Molarity for a solution2) A sample...
- Q Suppose 10.00 mL of 0.200 M HCl is added to an acetate bufferprepared by dissolving 0.100 mol of acetic acid and 0.110 mol ofsodium acetate in 0.100 L of solution....
- Q Gaseous butane CH3CH22CH3 will react with gaseous oxygen O2 toproduce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose4.65 g of butane is mixed with 5.3 g of oxygen. Calculate...
- Q I have a problem, and I have the answer but I don't know wherethe solution comes from. ( I have to be able to solve these myselfso please help me...
- Q what are the oxidation numbers for each atom3TiO2 + 4 C +6Cl2 ----->3TiCl4 + 2CO + 2CO2
- Q Equilibrium constants at 25 ?C are listed in the tablebelow.SubstanceKcValue of KcCaCO3Ksp4.5�10?9H2CO3Ka14.3�10?7Ka25.6�10?11What is the molar solubility of marble (i.e., [Ca2+] in asaturated solution) in normal rainwater, for which pH=5.60?Express your...
- Q What mass of sucrose (C12H22O11) should be combined with4.60×102 g of water to make a solution with an osmoticpressure of 9.00 bar at 310 K ? (Assume a density of...
- Q Given that the ASA (concentration of acetylsalicylic acid) is0.0087 M, calculate the concentration of tetraaquasalicylato ion[Fe(H2O)4SA]+ in solution 1Solution 1: volume = 2.00 mL,absorbance = 0.339If you could show work...
- Q How many grams of ethylene glycol (C2H6O2) must be added to 1.20kg of water to produce a solution that freezes at -3.88 ?C?
- Q 1. What are the [H2AsO4-] and [AsO4^3-] in a solution of 2.3 Marsenic acid?2. What is the pH of a solution made by mixing 9.00 grams ofethylamine, C2H5NH2, with enough...
- Q a) two 10.0 Ml water samples were taking The procedure in thisexperiment is followed to determine the phosphate concentration.What would be the average phosphate concentration in the solutionbe( in units...
- Q A compound of molar mass 213 contains only carbon, hydrogen,iodine, and oxygen. Analysis shows that a sample of the compoundcontains 6 times as much carbon as hydrogen, by mass.Calculate themolecular...
- Q (a) Balance the following half-reactions by the ion-electronhalf-reaction method:(i) (acid solution) NO3 – (aq) → N2O (g)(ii) (acid solution) FeO4 2– (aq) → Fe3+ (aq)(iii) (base solution) Fe2O3 (s) →...
- Q Consider a reaction with the following thermodynamicproperties.ΔH° = 77.7 kJΔS° = –35.7 J/(K •mol)ΔG°= 88.4 kJThis reaction:will proceed very slowly.will be spontaneous at low temperatures.has bonds in the products that...
- Q What factors will influence the migration rate in CE? Whatfactors may increase the resolution of CE?
- Q SYNTHESIS OF CHLOROPENTAAMINE COBALT (III) ChlorideIdentify the limiting reactant and What is the theoreticalmass of the complex that should be obtained?
- Q In a series of experiments, the U.S. Navy developed an underseahabitat. In one experiment, the mole percent composition of theatmosphere in the undersea habitat was 79.0% He, 17.0%N2, and 4.00%...
- Q A) An aqueous solution is 3.50% by masshydrochloric acid, HCl, and has adensity of 1.02 g/mL.  The molality of hydrochloric acid in the solutionis ____ m.B) An aqueous solution of iron(III)...
- Q Explain why bond polarity and molecule polarity are two separatecharacteristics.
- Q Yeast are unicellular eukaryotic organisms that have beenutilized for thousands of years to produce leavened (risen) breadand alcoholic beverages. To make leavened bread yeast are added tothe bread dough and...
- Q An aqueous solution containing 1.00 g of oxobutanedioc acid (FM132.07) per 100 mL was titrated with 0.09432 M NaOH.Calculate the pH at th following volumes of added base:0.5Ve1, Ve1, 1.5Ve2,Ve2,...
- Q 1. Sketch a proposed set up for the hot bath. Make sure that allof the listed equipment is included in the sketch (the drawing doesnot have to be of professional...
- Q Which of the following reactions is properly classified as aprecipitation, reduction/oxidation, and/or Bronsted-Lowry acid/basereaction? (1) CH3COOH(aq) + OH− (aq) → H2O(l) + CH3COO− (aq) isboth precipitation and acid/base (2) CH4(g)...
- Q 22 Pre-Lab Study QuestionsWhat happens to glucose or galactose when the Cu2+ inBenedict’s reagent is reduced?Would you expect fructose or glucose to form a red color rapidlywith Seliwanoff’s reagent? Explain...
- Q Can you detect any trends in formula, mass and boiling point bpin going down this series of molecules? What would you predict as arule for determining bp? Can you support...
- Q Please balance the following redox equation using halfreactions. Show work.___ NaOH + ___ Ca(OH)2 + ___ C + ___ ClO2---> ___ NaClO2 + ___ CaCO3 + ___H2O
- Q 1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80L . What is the volume of 0.29 mol of nitrogen gas under the sameconditions? Express your answer using...
- Q Do you think that eggs are healthy food?Explain using the appropriate chemistry terminology, andprovide at least two references to support yourarguments.
- Q 1. can ice be melted merely by applying pressure? how about dryice? Explain your answers.2. explain how the solid liquid line in the phase diagram of waterdiffers in character from...
- Q 1) Rank the following from the strongest acid to the weakestacid. Explain with reasons please.A) CH3CH2OHB) CH3OCH3C) CH3—NH—CH3D) CH3—C≡CHE) CH3—CH=CH22) Draw all possible isomers that have the molecular formulaC5H12O and...
- Q How much 6.0M NaOH must be added to .500 L of a buffer that is.0200M acetic acid and .025 M sodium acetate to raise the pH to5.75 at 25C?
- Q The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide,CuO(s), is an exothermic process,2Cu2O(s) + O2(g) ----> 4CuO(s) Delta H (reaction)= -292.0 Kj/molCalculate the energy released as heat when 9.67 g...
- Q In which of the following pairs of bonds is the shorter bondlength not followed by the longer bond length?C=O, C=SC?Si, C?SC?C, C=CS?O, P?ON?O, N=O
- Q Describe below (briefly) a) the motivation for hybridization invalence bond theory and b) why valence bond theory cannot predictmagnetism. In your answer, make sure to include a description ofhow molecular...
- Q What is the pH of a solution which begins to precipitate PbS(Ksp = 8.4 x I 0-28 from a solution which is 0.01 M with respect toPb2+ and has an...
- Q Consider what is the pH of the solution when 25.0mL of 0.01MNaOH is added to 25.0mL of 0.01M acetic acid. Is it the same as inthe case of HCl solution?...
- Q Describe the protein Keratin with cited sourcesdescribing the function of this protein.
- Q An electrochemical cell is based on the following twohalf-reactions:Ox: Sn(s)→Sn2+(aq, 1.65 M )+2e−Red: ClO2(g, 0.165 atm )+e−→ClO−2(aq,1.90 M )Compute the cell potential at 25 ∘C.
- Q a) Give the mathematical equilibrium constant expression Kc andKp (not the value!) for the reaction2N2O5(g) ↔ 4NO2 (g) + O2(g)b) At 250oC the concentrations of N2O5, NO2 and O2 are...
- Q For the following reactions, state whether you expect ΔSrxn tobe positive or negative.•Ag+(aq) + Cl–(aq) → AgCl(s)•H2O(s) → H2O(g)•H2(g) + Cl2(g) → 2HCl(g)•N2(g) + 3H2(g) → 2NH3(g)•H2O(l) → H2O(s)•2H2(g) +...
- Q Consider mixing an excess of lead(II) nitrate (aq) with 200.0 mLof 0.400 M sodium chloride. Determine the mass of solid formed,assuming a complete reactionWhat volume (in mL) of 0.800 M...
- Q A 5.65 −g sample of a weak acid with Ka=1.3×10−4 wascombined with 5.20 mL of 5.90 M NaOH and the resulting solution wasdiluted to 750 mL. The measured pH of...
- Q Iron (III) ion and thiocyanate ion exists in equilibrium withiron thiocyanate ion. The reaction, as written, isexothermic. Given that theFeNCS2+product is a deep red color and the reactants are nearly...
- Q Discuss the most important factors that influence the oxidationprocesses of sulphide minerals. Use the relevantequations/information whenever it is appropriate. (maximum 250words)
- Q 1) Cyclopropane, a substance used with oxygen as a generalanesthetic, contains only two elements, carbon and hydrogen. When1.00 g of this substance is completely combusted, 3.14 g of CO2 and1.29...
- Q whystudying the Stereophysical organic chemistry? please give me 3reasons
- Q In the Chemical Equilibrium experiment, the effect ofinteracting equilibria was studied using the following chemicalreactions. Addition of which species will cause the primaryequilibrium to shift to the right? Select any/all...
- Q A chemist fills a reaction vessel with 1.54 atm nitrogen N 2gas, 4.42 atm oxygen O 2 gas, and 8.99 atm nitrogen monoxide NO gasat a temperature of 25.0 °...
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