Chemistry question and answers for July 01, 2023
- Q What safety concerns are there for dissolving the copper withconcentrated nitric acid?
- Q Use calculations to show what is the effect on the value of thewater of hydration should you fail to perform ignition on yourcrucible. Explain your answer.
- Q CaCO3 can be roasted to produce CaO and CO2. This reaction iscarried out in a flask connected to an open-end mercury manometerwhen the atmospheric pressure is 764 torr. If the...
- Q A sample of wine was diluted 1:10 and analyzed for alcoholcontent. A calibration curve was created from a set of standardsolutions producing a plot of absorbance vs. percent alcohol. Thecalibration...
- Q 1) What is the concentration of Fe3+ (after mixing but beforereacting) in a solution made with 2.73 mL of 0.0639 M Fe(NO3)3 and3.89 mL of 0.0231 M KSCN? Please include...
- Q Outline the three stages in the extraction of energy fromfood
- Q True or False: EXPLAIN the false________ 1. An A-T base pair and a G-C base pair have about thesame physical dimensions.________ 2. mRNA is double-stranded.________ 3. rRNA and tRNA may...
- Q 1.Considering your results in the solubility tests, whatdo you conclude about the solubility of hydrocarbons in water?Predict the solubility of gasoline and motor oil inwater.2.Are hydrocarbons less dense or more...
- Q At 1 atm, how much energy is required to heat 35.0 g of H2O(s)at –20.0 °C to H2O(g) at 155.0 °C?
- Q What is beam modulation and why is it used in atomicabsorption?
- Q Provide the formula for at least one compound in which boronexhibits metalloid behavior. What aspects of this structure leadyou to believe that this is a good representative example?
- Q Lab: Exploration of Avogadro's Law-Determination of Percentageof Sodium Bicarbonate in an Alka-Seltzer Tablet1) One concern with setting up a closed system experiment wheregas is evolved during a reaction is the...
- Q 1using the phrase vapor pressure and atmosphericpressure define boiling point2does the boiling point of a liquid increase ordecrease in a vacuum and why?3 does the boiling point of a liquid...
- Q You proceed to measure the equilibrium constant at three moretemperatures, and now have the following results:Temperature (K)Equilibrium constant100.0 ± 0.01(1.6±0.1) ×104150.0±0.01(3.3±0.1) ×104200.0 ± 0.01(5.7±0.1) ×104250.0±0.01(6.2±0.1) ×104300.0±0.01(7.8±0.1) ×104(a) Linearize your date...
- Q Draw a titration curve for each of the following situations.Include the volumes and pH values for all equivalence points andhalfway points.a) 45.0 mL of 0.250 M KOH is titrated with...
- Q One method of removing phosphate from wastewater effluent is toprecipitate itwith aluminium sulfate (alum). A possiblestoichiometry (but not exact because aluminium andphosphate canform many different chemical materials) is:2 PO43- +...
- Q A(g) + 2B(g) → C(g) + D(g)If you initially start with 1.00 atm of both A and B and findthat at equilibrium 0.211 atm of C is present, what is...
- Q Multi-stage flash distillation is used to desalinate seawater soit is fit for human consumption. A flash distillation tank iscomposed of small chambers (called \"stages\"), each at a lowerpressure than the...
- Q How many moles of H2 and N2 can be formedby the decomposition of 2.56 mol of ammonia, NH3?
- Q Discuss the differences in the quality of water obtained fromgroundwater sources and water obtained from surface watersources.
- Q Consider two solutions. One solution is 0.1385 M Ba(OH)2. Theother is 0.2050 M HBr.a. Calculate the pH of the HBr solution.b. Calculte the pH of the Ba(OH)2 solution.c. If 50.00...
- Q Consider the one dimensional model of one-particle-in-a-box. Underwhat condition the two quantum levels are orthogonal. Namely, findthe relation between m and n so that < m | n > =...
- Q Sketch a PV diagram for a pure substance. Include severalisotherms and phase envelopes. Label the solid, gas/vapor,liquid/vapor, liquid, solid/liquid, and solid/vapor phases. For theliquid, vapor/liquid, and gas/vapor regions, indicate anappropriate...
- Q Calculate the pH and concentrations of the following species ina 0.025 M carbonic acid solution. (Given Ka1 = 4.3x10-7 and Ka2 =5.6x10-11)a) H2CO3b) HCO3-c) CO32-d) H+e) OH
- Q The equilibrium constant Kc for the following reaction is 4.59 ×10-7 at 730oC. 2HBr(g) ⇌ H2(g) + Br2(g) Suppose 3.20 mol HBr and1.50 mol H2 are added to a rigid...
- Q Tell if the following (marked with * belongs to the categoriesbelow) Law of conservation of mass/ law of definite proportions/law of multiple proportions.* When 3g of carbon reacts with 8...
- Q i need a good introduction for a lab report about (isolation ofcaffeine from No-Doz tablets) . i am really not good at writingintroduction and councluion.for introduction i only wrote (...
- Q 2. There are 8 confirmed planets in our solar system. The numberof significant figures in this number is 1. True or False?Explain.3 Do the following calculations, reporting the correct number...
- Q Organic II lab: Relative Rates of Electrophilic AromaticSubstitutionIn this experiment, acetic acid is used as a catalyst for theelectrophilic substitution on aromatic rings. Would this catalystwork with nitrobenzene? Explain your...
- Q 10.00 mL of 3.48E-3 M Fe(NO3)3 is mixed with 4.00 mL of 2.84E-3M KSCN and 6.00 mL of water. The equalibrium molarity of FeSCN2+ isfound to be 8.70E-5 M. If...
- Q Write the molecular formula for a compound with the possibleelements C, H, N and O that exhibits a molecular ion atM+ =128.063.Exact Masses of the Most Abundant Isotope of SelectedElementsIsotopeNatural...
- Q Determine the binding energy (in MeV) per nucleon for thenuclides: a) 816O, b) 817O, c) 2656Fe, d) 92235Uplease show steps!
- Q A nuclear scientist attemps to perform experiments on the stablenuclide 56Fe26. Determine the energy (in MeV) the scientist willneed to: 1. remove a single neutron 2. remove a single proton...
- Q a power plant treats 2 ML/d of feedwater to remove total organiccarbon (TOC). The source water contains 30 mg/L of TOC. Thetreatment system consists of a square coagulation and flocculationtank...
- Q Calculate the amount of energy in kilojoules needed to change333 g of water ice at −10 ∘C to steam at 125 ∘C. The followingconstants may be useful:Cm (ice)=36.57 J/(mol⋅∘C)Cm (water)=75.40...
- Q How would the percent sulfate in the sample be affected by: a)leaving some precipitate on the stirring rod? c) adding the silvernitrate to the precipitate in the funnel instead of...
- Q Identify the compounds that are soluble in both water and hexane.A) methanol and ethanolB) ethanol and 1-butanolC) ethanol and 1-propanolD) 1-butanol and 1-pentanolE) 1-propanol and 1-butanol
- Q What part of the proteins structure produces a color with thereagents used a) in the biuret method? b) in the Lowry method?
- Q determine the total mass gain or loss for the reactionby comparing your initial mass to your final mass. combined mass ofvinegar and baking soda.initial total mass?final total mass?difference?run 1 grams...
- Q At 3748°C, K = 0.093 for the following reaction. N2(g) + O2(g)equilibrium reaction arrow 2 NO(g) Calculate the concentrations ofall species at equilibrium for each of the following cases. (a)...
- Q For a lab, I need to be able to identify an ionic compound outof 50 other ionic compounds. There is a long list of Cations andAnions that assemble for each...
- Q When methane (CH4) burns, it reacts with oxygen gasto produce carbon dioxide and water.The unbalanced equation for thisreaction is CH4(g)+O2(g) →CO2(g)+H2O(g)This type of reaction is referredto as a complete combustion...
- Q Given K = 3.58 at 45°C for the reaction A(g) + B(g) equilibriumreaction arrow C(g) and K = 7.06 at 45°C for the reaction 2 A(g) +D(g) equilibrium reaction arrow...
- Q Which of the following molecules would you expect to have thelargest molecular dipole (which is the most polar)?a) CH4b) CH2F2c) CH3Fd) BF3e) CF4
- Q Draw and name the three demential shape for SOCl2. Indicate thecalues of the bond angles assuming they are ideal.Which of these molecules is the least polar?A. CH2O B. F2 C....
- Q In general, when comparing compounds of similar molecularweight, which of the following would have the highest boilingpoint?
- Q State the kind of intermolecular forces that would occur betweenthe solute and solvent in acetic acid (polar, contains an OH group)solutionCheck all that apply.dispersionhydrogen bondingion-dipoledipole-dipole
- Q Complete combustion of a 0.0150 mol sample of a hydrocarbon,CxHy, gives 3.024 L of CO2 at STP and 1.891 g of H2O.(a) What is the molecular formula of the hydrocarbon?(b)...
- Q Draw the structural formula(s) for the constitutional isomer(s)with the molecular formula C8H18 that have anunbranched chain. (There are four possible isomers)
- Q Moles, molarity, and compositiona) How many gmol are there in 21.2 kg of isobutyl succinate(C12H22O4)?b) If sucrose (C12H22O11) crystals flow into a hopper at a rate of4.5 kg s^-1, how...
- Q Which molecule is most polar, and which molecule is least polar,CF4, CHF3, CH2F2, CH3F. and why
- Q CH3F, SeO2, ICL4 Find Number of valence electrons, Moleculargeometry, Hybridization of central atom, Polar and non Polar orionic of them.
- Q Rank the following in order of increasing polarity: CH3CI, CH3F, and CH3Br (Please input answers with the following format: CH3CI) Least polar Most polar
- Q Which is a polar molecule among the following?PCl5CH3FPF5BeF2SiF4
- Q which of these molecules is the least polar?(a)CH2O(b) F2(c) CH3F(d) CH3Cl
- Q Which of the molecules are polar? Check all that apply. BeCl2,CH3F, H2O, HF, CH4, NH3
- Q For each molecule or ion below, indicate whether it is polar or nonpolar. For polar species, clearly indicate the direction of the molecular dipole on a Lewis Structure. CH3F SO2 PH3
- Q Identify the major functional groups in the substance below? ketal, ketone, acetal hemiacetal, ketone, acetal hemiacetal, ketal, ketone hemiketal, ketone, ketal acetal, acetal, ketone
- Q Is fluoromethane, CH3F, a polar or non-polar molecule? Explain your answer.
- Q What volume of a concentrated HCl solution, which is 36.0% HClby mass and has a density of 1.179 g/mL, should be used to make4.95 L of an HCl solution with...
- Q Consider a 0.3 L aqueous solution that contains 2.6 g ofcaffeine. The solubility of caffeine in water is 2.2 g/100 mL andthe solubility in methylene chloride is 10.2 g/100 mL.a)...
- Q Consider the following four equilibria at 298 K:CH4(g) + 4S(s) ⇌ CS2(g) + 2H2S(g) Kp = 9.5 × 10-10S(s) + F2(g) ⇌ SF2(g) Kp = 1.6 × 1053C2F2(g) + 4H2(g)...
- Q Determine the binding energy (in MeV) per nucleon for thenuclides:a) O-16/8b) O-17/8c) Fe-56/26d) U-235/92
- Q Garnet typically has the chemical formula: (Fe2+,Mg2+, Ca 2+, Mn2+)3 Al3+2Si4+3O12The formula can be broken up into structural sites (spaces wherecations of a certain size range can occupy) X3Y2Z3O12 where...
- Q Each statement refers to its own solution; which of thefollowing won’t affect the pH value of that given solution?Adding 100 mL of deionized H2O to a solution with pHof 2.5Heating...
- Q What exactly is polarizablity? Yes, the bigger the molecule, thelarger the polarizability, but what does that actually mean?
- Q A filled water bed has the dimensions 8.0 ft x 7.0 ft x 0.75 ft.Determine the mass of water, in kilograms, needed to fill the bed.Density of water = 1.00...
- Q How many grams of dipotassium succinate trihydrate(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 760.0 mL of a0.0583 M succinic acid solution to produce a pH of 5.980? Succinicacid...
- Q 11.35 g (about one tablespoon) of table sugar (sucrose,C12H22O11) is dissolved in 242.9 mL of water (density 0.997 g/mL).The final volume is 250.0 mL (about one cup). 1.Calculate themolarity of...
- Q A solution is prepared by dissolving 11.6 g of a mixture ofsodium carbonate and sodium bicarbonate in 1.00 L of water. A 300.0cm3sample of the solution is then treated with...
- Q You do a combustion analysis of an unknown solid (mass95.98g) containing C,H, and O following the reaction: [CxHyOz + O2>>> CO2 + H2O]. You are able to measure a mass...
- Q For the reaction below, determine the equilibrium partialpressure (in atm) of HBr at 252.70 K if the initial pressure ofH2 is 2.83 atm. Assume that ΔH and ΔS do not...
- Q Consider the following equilibrium for which H = 16.48:2 NOBr(g) Y--> 2 NO(g) + Br2(g)How will each of the following changes affect an equilibriummixture of the 3 gases in this...
- Q While running the titration of your unknown monoprotic acid withNaOH, the pKa of the acid is 3.14. Considering the data in thefollowing table, at what volume of NaOH would you...
- Q The mass ratio of sodium to flourine in sodiumflouride is 1:21:1. A sample of sodium flouride produced 34.5g ofsodium upon decomposition. How much flourine in grams wasformed?
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