Chemistry question and answers for August 11, 2023
- Q explain the difference in properties of diamond andgraphite.-why is graphite black while diamond is not?-why is graphite very conductive while diamond is not a goodconductor of electricity?-why is graphite soft...
- Q what information give SDS-PAGE about the proteins that are beinganalysed ?
- Q Answer the following questions for the transition metalcomplex [Mn(CN)6]3-.Using sigma-only considerations:a) Draw the 5 d orbitals associated with the transition metalcenter and state whether each one will overlap (strongly, weakly,or...
- Q How to explain the basic principles, instrumentoperation and the application of Microwave Induced Plasma - AtomicEmission Spectrometry (MIP-AES)?
- Q What is the pH of a solution if I mix together 45 mL of 5.67mol/L Acetic acid (CH​ COOH) and 83 mL of 2.35 mol/L NaOH?Ka of acetic acid =...
- Q The ability of an atom in a molecule to pull bonding electronstoward itself is:a)Paramagnetismb)Diamagnetismc)Effective nuclear charged)Electronegativitye)Ionization potentialGiven the electronegativity values below, select the single bondthat is LEAST polar.Element: H C...
- Q Ethylene glycol, formula C2H6O2, is used as antifreeze forautomobiles and is sometimes mixed with water at a 1:1 ratio byvolume and produces a solution with a density of 1.07 g/mL....
- Q Imagine that you grew a shiny crystal of a brand new compound X.How would you determine: (a) the crystal structure of X (b) whetherthis material is a semiconductor or not
- Q Balance the skeleton redox reaction. Write the oxidation stateof each compound above the redox symbol, show each redoxcouple/half reaction. Show both the acidic and basic state. Theanswer must demonstrate the...
- Q A solution is prepared in which 0.00100 mol of Ni(NO3)2 and0.500 mole of NH3 are dissolved in a total volume of 1.00 L. Whatis the concentration of Ni(H2O)62+ ions in...
- Q For each of the substances in below classify it as a strong orweak electrolyte and state whetherit exists in solution as molecules, ions, or a mixture of bothmolecules andions.a) hypochlorous...
- Q A 2.800×10−2 M solution of NaCl in water is at 20.0∘C. Thesample was created by dissolving a sample of NaCl in water and thenbringing the volume up to 1.000 L....
- Q A 0.120 M solution of an enantiomerically pure chiral compound Dhas an observed rotation of 0.24° in a 1-dm sample container. Themolar mass of the compound is 140.0 g/mol.a) what...
- Q Make 350 mL of 43 mM sodium phosphate buffer, pH 7.0 withouttitrating with NaOH or HCI. Show your calculations, which 2 speciesof sodium phosphate you choose (species are H3PO4, NaH2PO4,Na2HPO4,...
- Q The thermal decomposition of dimethyl ether CH 3 2 O g CH 4 g H2 g CO g is to be carried out in an isothermal 2.00-literlaboratory reactor at 600°C....
- Q The table of diprotic acids below shows how the acidity of the1st proton is always much higher than the acidity of the secondproton.Thus, the pH of the solution is dominated...
- Q Cocaine is a weak organic base whose molecular formula is C​17H​​21N​ O​4.​ At 15 degrees​C an aqueous solution of cocaine wasfound to have a pH of 8.53 and an osmotic...
- Q A 240.0-mL sample of spring water was treated to convert anyiron present to Fe2+. Addition of 27.00-mL of 0.002520 MK2Cr2O7 resulted in thereaction6Fe2+ + Cr2O72- +14H+ ----> 6Fe3+ + 2Cr3+...
- Q Consider the following reaction at 283 K:2A + B → C + Dwhere rate = k[A][B]2. An experiment was performedwhere [A]o = 2.67 M and [B]o = 0.00241 M. Aplot...
- Q How many milliliters of 4.7 M HCl must be added to 3.9L of 0.11 M K2HPO4 to prepare a pH =7.44 buffer?
- Q Methane, a powerful greenhouse gas, is generated viathe anaerobic decomposition of solid waste in landfills. Collectingthe methane for use as a gaseous fuel rather than allowing it to bereleased to...
- Q Drops are used as a measure of volume in thislab.  Explain why it is important to beconsistent in thesize and counting of the drops.
- Q Calculate thechange in pH when 0.32 mol H+is added to1.00 L of each of the following buffer(a) a 0.56 Msolution of pyridine (py) containing 0.50 MpyH+Number....(b) a 0.58 Msolution of...
- Q ssume you dissolve 0.235 g of the weak acid benzoic acid,C6H5CO2H, in enough water to make 4.00 ✕ 102 mL of solution andthen titrate the solution with 0.163 M NaOH....
- Q Histidine has ionizable groups with pKa values of 1.8, 6.0, and9.2, as shown below. A biochemist makes up 100 mL of a 0.100 Msolution of histidine at a pH of...
- Q So let’s say you have a beaker that contains 78.8g ofammonium carbonate and to this you add 175 mL of 5.80 Mhydrochloric acid according to the following chemicalequation:2HCl(aq) + (NH4)2CO3(s)...
- Q A) For Gorilla glass, Xensation, Sapphire glass, and Dragontrailglass, tabulate their composition, how they are made and processed,their hardness, strength, and cost.? Please, noEnglish (Merican) units..Answer the question in clear...
- Q The decomposition of XY is second order in XYand has a rateconstant of 7.20
- Q Calculate the molarity of a 1.8 L solution that contains 6.71moles of NaCl. How many moles of NaOH are in a 935 mL solution thathas a concentration of 7.3 M?What...
- Q What is the pH of solution if 40 mL 0.1 M HCl is mixed with 60 mL0.2 M HAc?
- Q 29) What is the stoichiometric coefficient for oxygen when thefollowing equation is balanced using the lowest whole-numbercoefficients? ________ C3H6O2(l) + ________ O2(g) →________ CO2(g)+ ________ H2O(l) A) 5 B) 7...
- Q I am struggling with Mechanism problems in my organic Chemistry1 class. Can you explain how SN1, SN2, E1 and E2 play a role inmechanisms and everything else that is involved...
- Q HClO is a weak acid (Ka = 4.0
- Q Why is a photomultiplier tube not used as a detector at infraredwavelengths?
- Q If the Ecell of the following cell is 0.945 V, what is the pH inthe anode compartment? Pt(s) | H2 (1.00 atm) | H+(aq) || Ag+(0.100M) | Ag(s)1.245 is NOT...
- Q For the reactions shown below, we added 2.25 mL of 0.0460M HCl to a test tube containing one of the two cations(Ag+ or Pb2+) and recovered 0.0148 g ofprecipitate.AgNO3(aq) +...
- Q Copper(I) chloride hasKsp = 1.7 × 10-7. Calculate the molar solubility of copper(I)chloride in pure water and in various aqueous solutions.a. Calculate the molar solubility of CuCl in pure water....
- Q The average human body contains 5.10 L of blood with a Fe2+concentration of 3.20×10−5 M . If a person ingests 11.0 mL of 25.0mM NaCN, what percentage of iron(II) in...
- Q Select the grouping in which all statements are TRUE regardingthe rules for naming complexes:I. The ligands are named in alphabetical order after the metalion.II. The isomer (e.g.,cis†or transâ€) isincluded...
- Q Part AA 75.0-mL volume of 0.200 M NH3 (Kb=1.8×10−5) is titrated with0.500 M HNO3. Calculate the pH after the addition of 25.0 mL ofHNO3.Part BA 52.0-mL volume of 0.35 M...
- Q [2] Calculate ∆H°rxn and ∆S°rxn for the following reaction anddecide in which direction each of these factors will drive thereaction.N2(g) + 3 H2(g) → 2 NH3(g)
- Q A weak acid HA (pKa = 5.00) was titrated with 1.10 M KOH. Theacid solution had a volume of 100.0 mL and a molarity of 0.107 M.Find the pH at...
- Q Select the answer for which all statement(s) is/are TRUEregarding ligands in coordination complexes:I. Complexes with CN = 4 are typically square planar for d^8metal centers.II. Chelating ligands always bind the...
- Q Given a circular sheet of paper with a weight of 0.15 ounces anda diameter of 4.7 in. Calculate the basis weight in terms of g/m^2.Assuming the circle was cut from...
- Q Calculate the pMn2+ in the titration of 25.0 ml of 0.0200M MnSO4with 0.0100M EDTA in a solution buffered at ph=8 at the followingvolumes: 0.00ml, 20.0ml, 40.0ml, 49.0ml, 49.9ml, 50.0ml, 50.1ml,55.0ml,...
- Q Consider the following reaction: A(g)⇌B(g)+C(g) Find theequilibrium concentrations of A, B, and C for each of the followingdifferent values of Kc. Assume that the initial concentration of Ain each case...
- Q A certain zero order reaction has a half live of 2.5 secondswhen the initial concentration is 2.5 M. What concentration of thereactant remains after 4.5 seconds?The reaction shown below obeys...
- Q Calculate the number of pounds of CO 2 released into theatmosphere when a 21.0 gallon tank of gasoline is burned in anautomobile engine. Assume that gasoline is primarily octane, C...
- Q When calcium carbonate is added to hydrochloric acid, calciumchloride, carbon dioxide, and water are produced.CaCO3 + 2HCl ----------> CaCl2 + H2O + CO2A) How many grams of calcium chloride will...
- Q Procedure:1. A 25 mL round bottom flask equipped with a stir bar is loadedwith 13 mg of CdO powder, 0.6 mL of oleic acid, and 10 mL of1-octadecene. The reaction...
- Q The reaction 2H2S(g)⇌2H2(g)+S2(g)Kc=1.67×10−7 at 800∘C is carried out with thefollowing initial concentrations: [H2S] = 0.150 M , [H2] =0.375 M ,and [S2] = 0.00 M. Find the equilibrium concentrationof  [S2].
- Q Distinguish between the following adsorption isotherms:Langmuir, BET, Temkin and Freundlich. Indicate when and why each islikely to be appropriate.
- Q Write short notes on:Preparation of elements by chemical and electrochemicalroutes.Variable oxidation states in oxides and oxoanions of main groupelements. ( chloride or nitrogen orUse of metal complexes as anticancer agents.Different...
- Q zinc organic compounds are less reactive than magnesium organiccompounds. why is this lower reactivity useful? wouldnt chemistsalways want the powerful and very reactive reagents? explainbriefly and state the useful principle...
- Q What mass of F2 would have the same number of diatomic moleculesas there are hydrogen atoms in 20 grams of ammonia(NH3)?
- Q How many air molecules are in a 11.5×12.0×10.0 ft room? Assumeatmospheric pressure of 1.00 atm , a room temperature of 20.0 ∘C ,and ideal behavior?Volume conversion:There are 28.2 liters in...
- Q To measure the titratable acidity of a fizzy orangejuice you need to prepare standard solutions of 0.1NaOH.How would you prepare 0.1N NaOH from 50% NaOH stock? How would you standardize...
- Q Calculate ?H (298 K) per gram of fuel units of kJ*g^-1 (excludeoxygen)a.) H2(g) + O2(g) = H2O(g)b.) CH4(g) + 2O2(g) = CO2(g) + 2H2O(g)c.) CH3OH(l) +3/2 O2(g) = CO2(g) +...
- Q Chemical Engineering. The product gas from a coalgasification plant consists of 60.0 mole % CO and the balance H2;it leaves the plant at 150° C and 2000 psia. The gas...
- Q Calculate ΔE° for the following equation (with solutions):3Br2 + 2Cr3+ + 7H2O =Cr2O2-7 + 14H+ +6Br-
- Q Consider the titration of 42.0 mL of 0.270 M HF with 0.215 MNaOH. Calculate the pH at each of the following points.a) How many milliliters of base are required to...
- Q Vitamin C and E are powerful antioxidants. (a) What are theoxidized forms of vitamin C and E? (b) What is the product forvitamin C and E reacting with radical RO2∙?...
- Q Explain the general concept of a force field in molecularmodelling and explain why it might be used instead of afirst-principles method.
- Q Which of the following statements about quantum theory isincorrect?a.The energy and position of an electron cannot be determinedsimultaneously.b.Lower energy orbitals are filled with electrons before higherenergy orbitals.c.When filling orbitals of...
- Q Part ACalculate the equilibrium constant at 25 ∘C for thereactionNi(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s),ifNi2+(aq)+2e−→Ni(s), E∘= -0.26 V,Al+(aq)+e−→Al(s), E∘ =0.80 VExpress your answer using one significant figure.Part BCalculate the equilibrium constant at 25 ∘C for...
- Q Consider the gas phase reaction H2 + I2 = 2HI at equilibrium atT= 870 K and p = 1 bar. If ∆G˚ (870K, 1 bar) = - 48.96 kJ,determine K,...
- Q Silicon has a diamond crystal structure with lattice constant ofa= 0.543 nm and molar mass of 28.08 g/mole. (12 points) a) Explainin brief the position of silicon atoms in the...
- Q 1.Why doesn’t initiation occur in the micelles in emulsionpolymerization?2.Describe a gel for drug release.
- Q What answer should be reported, with the correct number ofsignificant figures, for the following calculation (249.36+41.3)/63.7?
- Q . In general what are the differences between hard ionizationand soft ionization sources? What kind of  molecular spectra would you expect to see fromusing each technique? Provide one example for  ...
- Q Hydrogen gas (a potential future fuel) can be formed by thereaction of methane with water according to the following equation:CH4(g)+H2O(g)→CO(g)+3H2(g)CH4(g)+H2O(g)→CO(g)+3H2(g) In aparticular reaction, 26.5 LL of methane gas (measured at...
- Q A 0.15 M solution of a weak acid is found to be 1.3% ionized.What is its Ka?
- Q Thermodynamic driving forces for ligand association 1 page (min300 words). Describe the various components of the Gibbs freeenergy and how these changes upon binding. Discuss who favorsbinding and which prevent...
- Q How do you find initial quantum number (ni) when given thevalues c=3.00 x 10^8 h=6.63 x 10^-34 nf=2 nm=656.2 andm=6.562x10^-7For the values; Red light= 656.2nm , Green light= 486.1nm, Bluelight...
- Q 1. Calculate the molar mass of each of the following compounds:a. Ethyl chloride , C2H5CI b. Phenobarbital, C12H12N2O3 C.Sodiumcarbonate, NaHCO3 d. Aluminum sulfate, Al2(SO4)3 e. Diethyl ether,(C2H5)2 O 2. Calculate...
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