Chemistry question and answers for September 19, 2023
- Q Choose one answerA 400 mOsm/1 glucose solution is:A) Hyposmotic to a 200 mM solution of KClB) isosmotic to a 600 mM solution of KClC) Isosmotic to a 0.18% solution of...
- Q how do adhesion and cohesion explain capillary action?how does water dissolve a substance like NaCl? Draw a pictureillustrating this
- Q what is the pH of the solution obtained by mixing 50.00 mL of0.1250 M HOAc and 25.00 mL of 0.100 M NaOH?
- Q Name the possible products of this reaction in the presence ofether and AlCl3: methylbenzene + 2-chlorobutane.1. 1-ethyl-2-methylbenzene2. 1-ethyl-3-methylbenzene3. 1-ethyl-4-methylbenzene1231 and 21 and 32 and 3none of these choices
- Q Consider the reaction: NO2 (g) + CO (g) --->CO2 (g) + NO (g)The equilibrium constant is at 701 K and 895 K are 2.57 and 567L mol-1 s-1 so,A. Find...
- Q Mass of flask, stopper, and 5mL of water102.945gMass of flask, stopper, and filled with water238.389gVolume of gas space in flask (the difference between the abovetwo measurements converted to mL) (L).135444LNaHCO3...
- Q What is the pH of a buffer solution that contains 0.350M pyruvicacid and 0.150M sodium pyruvate? Ka = 4.1x10^-3Select one:A. 4.72B. 2.82C. 2.02D. 2.76What is the pH of a 100.0mL...
- Q Please make sure to display your thought process? It isimperative to be able to follow how the answer was deduced. Pleasebe as thorough as possible. Please address all parts as...
- Q Consider the following reaction:CO(g)+2H2(g)⇌CH3OH(g)Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for thereaction at 25 ∘C under each of the following conditions.A) Standard conditionsB) At equilibriumC) PCH3OH= 1.5 atm ;PCO=PH2= 1.5×10−2 atm
- Q Atomic absorption spectroscopy was used with the method ofstandard additions to determine the concentration of cadmium in asample of an industrial waste stream. For the addition, 10.0 μL ofa 1000.0...
- Q Mass of flask, stopper, and 5mL of water (g)102.945gMass of flask, stopper, and filled with water (g)238.389gVolume of gas space in flask (the difference between the abovetwo measurements covnerted to...
- Q 1.921 g of the weak basetrimethylamine, (CH3)3N (MW = 59.11g/mol)(Kb = 6.3 x 10-5), is diluted in water togive 50.0 mL of solution. This solution is titrated with 0.10 MHCl....
- Q 1. Manganese(II) (Mn2+) forms a complex with EDTAaccording to Mn2+ + Y4- <->MnY2- with a formation constant Kf = 7.8 x1013.(a) 23.14 mL of 0.07893 M Mn2+ was titrated with0.08130...
- Q h nmr for 2,4-Dimethoxybenzoicacid
- Q Balance the equations or write the balanced chemical for thefollowing: A) C7H8O2(l) + O2(g) → CO2(g) + H2O(g)B) Copper(II) hydroxide decomposes into copper(II) oxide and waterwhen heated;C) Solid calcium carbide,...
- Q When a 7.00-g sample of RbBr isdissolved in water in a calorimeter that has a total heat capacityof 3.090 kJ·K–1, the temperature decreases by 0.300 K. Calculatethe molar heat of...
- Q Consider the titration of 25.0 mL of 0.0500 M Sn2+ with 0.100 MFe3+ in 1 M HCl to give Fe2+ and Sn4+, using a Pt and calomelelectrodes. (a) write a...
- Q Calculate the equilibrium constant K of the reactionSn(s)|Sn2+(aq)||Ag+(aq)|Ag(s)at 25 °C.
- Q The first four peaks in the X-ray powder diffraction pattern ofsodalite are at 2ï± values of 9.97°, 14.12°, 17.32° and 20.02°. Theradiation used for the experiment was Cu Kï¡ with...
- Q In my lab we found OUR average molarity to be 0.83334 M, but weused 3% H2O2 (hydrogen peroxide), so I'm not sure how to do this orwhat numbers to even...
- Q Preparing Buffer Solutions: Calculating the Number of Grams ofConjugate Base NeededUse the table of K values given with this problem to choose thebest weak acid to start from for making...
- Q A student dissolved 10.5 g of NH4Cl in 40 mL ofwater.  The temperature of the water changed from22.5oC to 5.1oC.  Calculate theenthalpy of hydration of ammonium chloride in J/mol.1.  A student collected the...
- Q What is percent yield fro your synthseis of octyl acetate(acetic anhydride and 1-octanol)? V of ctyl acetate is 1.53 mL.3 mL of acetic anhydride and 2 mL 1-octanol. One drop...
- Q A sample is analyzed to determine its iron content Fe2+ via aredox titration with potassium chromate as the titrant. In thetitration Fe2+ is oxidized to Fe3+ and CrO4 2- is...
- Q FeS can be roasted in O 2 to form FeO, according to the reaction2FeS + 3O 2 2FeO + 2SO 2 If the slag (solid product) contains 80%FeO and 20%...
- Q What is the mechanism by which solute is dissolved in non polarsolvents? Explain briefly. (5 mark)
- Q A mixture of propan-1-ol and 2-methylpropan-2-ol of unknown contentmay also contain a small amount of water. To determine the% by massof its propan-1-ol and 2-methylpropan-2-ol content, the mixture wassubjected to...
- Q Part B What mass of carbon dioxide is produced from the completecombustion of 6.90×10−3 g of methane? Express your answer with theappropriate units.Part C What mass of water is produced...
- Q In each pair, indicate which substance has the strongerintermolecular forces and explain your reasoning: (a) Ne, Ar; (b)NF3, BF3; (c) SiH4, GeH4; (d) NaF, HF.
- Q The equilibrium constant for the reaction of fluorine gas withbromine gas at 300 K is 54.7 and the reaction is: Br2(g) + F2(g) ⇔2 BrF(g) What is the equilibrium concentration...
- Q 1. Calculate the dilution factor and final concentration of thefollowing target analytes:20 mL of target analyte (2.5 M), to a final volume of 100 mL2 mL of target analyte (3.23...
- Q A solution containing a mixture of metal cations was treatedwith dilute HCl and a precipitate formed. The solution was filteredand H2S was bubbled through the acidic solution. A precipitateagain formed...
- Q Add the periodic trend of electronegativity to your periodictable.On your periodic table underline the elements that make up the7 diatomic molecules (from chapter 6.6) and add the periodic trendsof ionization...
- Q Please explain...In the titration of a weak acid HA with 0.100 M NaOH, thestoichiometric point is known to occur at a pH value ofapproximately 11. Which of the following indicators...
- Q balance redox reaction that occurs in acidic conditions. whatare coefficients for H + & Fe3+ once reaction is balanced?write it as H+=#; Fe +3 = #Fe2+(aq)+Mn04-(aq) -> Fe3+(aq)+Mn2+(aq)
- Q In organic chemistry, we have ortho/para activators anddeactivators. Why do we not have meta activators?
- Q 1. Ph of H3O+ of 5.7x10^32. Ph of a 1.5x10^-2 m for HBr3. ph of 3.24x10^-4 m of hypochlorous acid ka2.9x10^-8
- Q MATCH EACH TYPE OF CRYSTALLINE SOLID TO THE APPROPRIATE EXAMPLE:1. ATOMIC 2.METALLIC 3.IONIC 4. NETWORK COVALENT 5.MOLECULARA)C (GRAPHITE) B)N2 C)Kr D)Au e)MgBr2
- Q In my text book it states: The relative atomic mass of anelement is the average mass of an atom of the element, taking intoaccount all its isotopes and their relative...
- Q Calculate the hydronium ion concentration and the pH when 65.0mL of 0.45 M NH3 is mixed with 65.0 mL of 0.45 M HCl (Ka =5.6x10^-10).Concentration =pH=
- Q Indicate the concentration of each ion present in the solutionformed by mixing the following. (Assume that the volumes areadditive.)(a) 40 mL of 0.100 M HCl and 10.0 mL of 0.600M...
- Q The pH of a 0.120 M solution of a weak base is 10.97 at 25ºC.Calculate the pH of a 0.0316 M solution of this base at 25ºC.
- Q What are the three things the NMR spectra tell you for eachproton?
- Q Distinguish linear range, dynamic range, and range.
- Q derive BET isotherm adsorption equation step bystep
- Q Howdo we produce PMMA? one page long essay please not hand write itshard to read
- Q 7.) You need to make an aqueous solution of0.140 M nickel(II) sulfate for anexperiment in lab, using a 250 mL volumetricflask. How much solid nickel(II) sulfate shouldyou add?How many milliliters...
- Q Polarimetry Lab calculations:IsomerObserved Degree of Rotation(Raw data)(+) Carovene158.75°(-) Carovene229.75°Blank200.75°Unknown (X)175.25°I would like some help to figure out how to do this; I want tomake sure that I am doing it...
- Q Calculate the change in pH when 75.0 mL of a 0.620 Msolution of NaOH is added to 1.00 L of a solution that is 1.00M in sodium acetate and 1.00...
- Q Please compare and contrast intrinsic versus extrinsicfluorophores. Please be sure to clearly address differences interms of quantum yield, fluorescence lifetimes, cost, etc.
- Q Consider the titration of 0.050 M HCl with 0.050 M NaOH.Calculate the pH: (a) of the pure HCl solution; (b) of 25.00 mLacid plus 12.50 mL base; (c) at the...
- Q The dehydration of 2-methyl-2-butanol in sulfuric acid produces2 elimination products. However, this same reaction can alsoundergo substitution. What is the product of the substitutionreaction?
- Q Please answer within 1 hour. This is my last question and itsdue in 1 hour!! :(What atomic or hybrid orbitals make up the sigma bond between C2and Cl in dichloroethylene,...
- Q Electromagnetic radiation is emitted when a neutron and protonfuse to make a deuteron. What is the wavelength of thisradiation?
- Q Titanium metal has a melting point of 1660°C. Use theinformation below as needed to estimate the boiling point oftitanium. HINT: Try writing the boiling process as a simplechemical reaction, and...
- Q Give a brief definition of the following terms (a
- Q (1a) Explain what happens in Oxidation AND Reductionelectrochemical reactions.(1b) What happens to the ions formed in the oxidationreaction?
- Q Write the net equation for hydrolysis (with states and charges)of the following:A) NaC2H3O2B) NH4ClC) ZnCl2D) KAl(SO4)2
- Q Answer the following:1: a) . Breathalyzers determine the alcohol content in aperson’s breath by a redox reaction using dichromate ions (theunbalanced reaction is shown below). C2H5OH + Cr2O7 2− →...
- Q The reaction below was performed with 0.342 grams of K2CO3(molar mass = 138.21 g/mol). After the reaction was complete 0.0675grams of CO2 was recovered. What was the percent yield to...
- Q (i) The unbalanced chemical equation for the reaction to formAg2[Cr2O7] isCr3+ + S2O82-+H2O + AgNO3 →Ag2[Cr2O7] +SO42- + H+ +NO3-Balance the equation and determine which atoms were oxidised andwhich were...
- Q You perform a combustion analysis of 0.255g of a compound thatcontains C, H and O. You produce 0.561 g of CO2 and0.306g of H2O.A. How many grams of carbon and...
- Q How to Write a chemistry Lab report?I have to write a chemistry lab report, also to presnte it.The paper should incloud:- Abstract- Introduction- Methods- Results- Discussion- Conclusion- Confined research- CitationCan...
- Q what is the net ionic equation of Fe3+ and Br-, the speciesoxidized/reduced.what is the net ionic equation of I2 and Br-, and the speciesoxidized/reduced, the stronger oxidizing agent.
- Q Whyis physical constant and spectroscopy data more reliable thanchemical tests for unknown conplund identification ?
- Q Which of the following is an empirical formula?a. C2H6b. C3H8c. C4H10d. C6H6Please explain!:) Thank you for your help!!!
- Q Account for the following observations:The NH2CH2CH2CH2NH2 is a good bridging ligand, but itis not a bidentate chelate ligand.
- Q A buffer consists of 0.91-M propanoic acid ( Ka= 1.4 ×10-5) and 0.76-M sodium propanoate.a) Calculate the pH of this buffer.b)Calculate the pH after the addition of 1.2 mL of...
- Q Show step by step reactions with structures; and clear writingAcetyl chloride reacted with:- hexane- cyclo-hexane- toluene- 1-chlorobutane- 2-Chlorobutane- t-pentyl-chloride- chloro-benzene- 1-butanol- 2-butanol- t-pentyl alcoholLucas test reacted with:- hexane- cyclo-hexane- toluene-...
- Q Syrup is made of equal parts of water and sucrose. Mass of 1 cupof sucrose is 200.0g and mass of 1 cup water is 220g. whattemperature will the syrup boil...
- Q Other then a COUNTERFEIT DETECTION PEN , HOW chemistry is beingused in money detection and WHAT other chemical application can beused to prevent counterfeit currency from circulation.
- Q The pH of a 0.392 M solution of the conjugatebase, A-, of a weak acid, HA, is 11.60. What isthe Kb for A-?Please show work
- Q Consider a helium ion He+.a) Find the ratio between the ionization energy of the H atomand and the He^+ ion.b) How does the Bohr radius, we defined for H atom,...
- Q Clearly and completely describe a simple, ONE step (a singlereagent added) test that would allow you to distinguish between thefollowing:a) Bi(OH)3 and Al(OH)3b) Pb2+(aq) and Fe3+(aq)
- Q At 1177 K the partial pressures of an equilibrium mixture ofH2O, H2 and O2 are 0.0340, 0.0035 and 0.0013 atm, respectively.Given that the chemical equation for the equilibrium is, 2...
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