Chemistry question and answers for September 15, 2023
- Q (a) Potassium iodate solution was prepared by dissolving 1.022 gof KIO3 (FM 214.00) in a 500 mL volumetric flask. Then 50.00 mL ofthe solution was pipetted into a flask and...
- Q What is the solution to the problem of the abuse of painmedications? Use references to defend response.
- Q A solution is made by mixing 35.0 mL of ethanol, C2H6O, and 65.0mL of water. Assuming ideal behavior, what is the vapor pressure ofthe solution at 20 ∘C? The relevant...
- Q 1. Draw a structural formula for a compound that is made ofcarbon and hydrogen.2. What is the difference between:    a. an ionic bond and a covalentbond    b. a polar bond...
- Q Consider the following reaction: CO(g)+H2O(g)⇌CO2(g)+H2(g)Kp=0.0611 at 2000 K A reaction mixture initially contains a COpartial pressure of 1390 torr and a H2O partial pressure of 1770torr at 2000 K.A) Calculate...
- Q Write equations for the half-reactions that occur at the anodeand cathode for the electrolysis of each of the following aqueoussolutions.Part A Ni(NO3)2(aq) Express your answers as chemical equationsseparated by a...
- Q Consider the equilibrium betweenCOBr2, CO andBr2.COBr2(g)<-->CO(g) +Br2(g) K = 2.08 at382 KThe reaction is allowed to reach equilibrium in a14.6-L flask. At equilibrium,[COBr2] =4.50×10-2 M, [CO] =0.306 M and [Br2]...
- Q Sulfuric acid is the chemical produced in the United States withthe highest volume of production. In one of the earliest processesused to make it, an ore containing iron pyrites (FeS2)...
- Q A weak base B (neutral charge) is dissolved in water at aconcentration of 0.500 M. The concentration of the resulting ionsis 0.170. What is the numerical value of Kb? The...
- Q 1. if a buffer has a 4 charge and it is involved in removing twohydrogen ions from a solution, the buffers charge will become:2. How many times more basic is...
- Q Consider 100 g of 252Fm, which decays in a sequence of 5 αdecays to eventually reach 232Th. The relevant half-livesfollow:252 Fm :25.39 hr248 Cf :333.5 d244 Cm : 18.10 yr240Pu...
- Q CH4(g) + Cl2(g)  CH2Cl2(g) + 2 HCl(g) Use the data in the tablebelow to calculate the standard enthalpy, ∆H˚, for the reactionabove. Substance CH4(g) CH2Cl2(g) HCl(g) ∆Hf˚, kJ•mol-1 –74.6...
- Q A 0.01 % solution of paracetamol API was analysed by HPLC givinga peak at 4.35 minutes from a c18 5 micron column. The peak area is159785643. The peak area of...
- Q Fora pharmalogical experiment you need 1L of a drug at a concentrationof 10x10-6 in saline. You have aliquots of a stock solution at aconcentration of 10mM. How do you make...
- Q What do you think would happen if you connected the pencil leadconnected to the negative post after being in the copper nitratesolution to the positive post of the battery? explain...
- Q Ammonia rapidly reacts with hydrogen chloride, making ammoniumchloride. Calculate the number of grams of excess reactant when6.16 g of NH3 reacts with 4.46 g of HCl
- Q 5. Using boxes to represent orbitals, draw the molecularorbital energy level diagrams for the following molecules, withenergy increasing vertically, putting electrons into theappropriate orbitals. For each indicate: the bond order...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.220 M HClO(aq) with 0.220 M KOH(aq). Theionization constant for HClO is 4.0e-8.(a) before addition...
- Q Why does the formation of 5-methylcytosine look morechemically difficult than formation ofN6-methyladenine?
- Q You may want to reference (Pages 821 - 825) Section 17.8 whilecompleting this problem. You mix a 120.0 −mL − m L sample of asolution that is 0.0123 M M...
- Q A gaseous mixture contains 413.0 Torr of H2(g), 391.5 Torr ofN2(g), and 65.7 Torr of Ar(g). Calculate the mole fraction, X, ofeach of these gases.
- Q Calculate the equilibrium 135I concentration and theequilibrium 135Xe for 3.0 w/o enriched fuel in a reactorthat operates with a thermal neutron flux of 1 x1013/(cm2*s). Use the value of Σf=...
- Q An aqueous sodium sulfide solution has a vapor pressure of80.9mmHg at 50 ?C. The vapor pressure of pure water at thistemperature is 92.6 mmHg. (Assume sodium sulfide completelydissociates.)What is the...
- Q 1)Write the complete equation (balanced with states) for thereaction between potassium chloride and lead (II) nitrate?2) Which precipitate forms in the above mentioned reaction?3) You mix 16.00 mL of 0.778...
- Q . The freezing point of benzene is 5.5oC What is thefreezing point of a solution of 5.00 g C10H8in 444 g  of benzene. You will need to look up thefreezing...
- Q Liquid A has a normal boiling point of 64 deg C and liquid B hasa normal boiling point of 98 deg C. a) which has the greater vaporpressure? b) which...
- Q 1A. A 1.54 gram sample of an unknown gas isfound to occupy a volume of 0.780 L at a pressureof 728 mm Hg and a temperature of33°C. The molecular weight...
- Q Evaluate the fugacity for a gas of Ar at 100 bar and 298 K
- Q What is the importance of the Sandmeyer Reaction?What is the azide group and why it is a good leavinggroup?Explain how the mechanism of the Sandmeyer reaction differsof a typical Electrophylic...
- Q Skeletal Equation:IO3+(aq)+HSO3-(aq)->I-(aq)+SO42-(aq)A) Which of the following correctly identifies the number ofelectrons transferred per entity?6e-/S2e-/S4e-/I3e-/IB) Balance the Skeletal EquationC) When the skeletal equation is balanced under acidicconditions, the amount of electrons...
- Q A sealed 1.0-L flask, initially containing 0.20 M COCl2, 0.20 MCl2, and 0.20 M CO, is heated to 700 Kand allowed to come to equilibrium.COCl2(g) ⇌ Cl2(g) + CO(g) Kc...
- Q A sample of an ideal gas occupies a volume of 25.0 liters at apressure of 1.20 atm and a temperature of 75 degrees C. How manymoles of gas are present...
- Q After mixing 5.00 mL of the 5.0×10–5 M crystal violet solutionwith 5.00 mL of 0.20 M NaOH, what is the concentration of crystalviolet and hydroxide ions in the solution at...
- Q 1. The pH of a solution made of 1.0 M acetic acid and 0.1 Mpotassium acetate is (K_a = 1.8 x 10^-5) to which 0.001 mol of KOHhas been added:...
- Q Consider the reactionN2(g)+3H2(g)→2NH3(g)ΔHorxn= −92.6 kJ/molIf 2.0 moles of N2 react with6.0 moles of H2 to formNH3, calculate the work done (injoules) against a pressure of 1.0 atm at 25 degreescelsius.What...
- Q A compound with the formula XOCl3 is synthesized, isolated andpurified.When 3.270 g of this compound are decomposed chemically, asolution of chloride ions is produced.The chloride ions are precipitated with silver...
- Q The Ka of a monoprotic weak acid is 2.50 × 10-3. What is thepercent ionization of a 0.176 M solution of this acid?
- Q With respect to proteomics and Mass Spec, what is Data DependentAcquisition and how does it affects dynamic range of proteomemeasurements?
- Q Consider the following reaction:CO(g)+H2O(g)⇌CO2(g)+H2(g)Kp=0.0611 at 2000 KA reaction mixture initially contains a CO partial pressure of 1346torr and a H2O partial pressure of 1762 torr at 2000 K.A.) Calculate the...
- Q Put a circle around the Lewis Acids and a Box aroundthe Lewis Bases:Ca2+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â S2-Â Â Â Â Â Â Â Â Â Â Â Â Â Â OH-Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Fe3+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â I-pHpOH[H+], M[OH-], MIs it acidic, basic or a neutral soln?2.2.63.3.44.3.2 x 10-95.4.7 x 10-36.1 x 10-7
- Q Predict which of the following would be the most effectiveanti-freeze, assuming equal weight of each are used: methylalcohol(CH3OH) ; sucrose(C12H22O11); ethyl alcohol (C2H5OH);ethylene glycol ( C2H4(OH)2). Explain your choise!
- Q You weighed a solid sample of an unknown mixture of carbonateand bicarbonate to be 5.3431 grams. You properly dissolved theentire unknown solid sample in 250.0 mL of boiled and cooleddistilled...
- Q sodium hydroxide dissolves very easily, and exothermically, inwater. Using values from the appendix in your text, calculate theKsp for this salt, as well as the temperature at which thisreaction becomes...
- Q which medication can cause hypoglycemia?ticagreor, aspirin, metformin, glyburide, valsartan,diltiazem
- Q Apply 1D infinite ?(?) PiB model to the π-network in butadiene(assume that the molecule is linear and use the values 135 and 154pm for lengths of C=C and C–C bonds).a)...
- Q Indicate the concentration of each ion present in the solutionformed by mixing the following. (Assume that the volumes areadditive.)(a) 60 mL of 0.100 M HCl and 10.0 mL of 0.480M...
- Q Consider the following balanced equation for the combustion ofbutane, a fuel often used in lighters:2C4H10(g)+13O2(g)→8CO2(g)+10H2O(g)2C4H10(g)+13O2(g)→8CO2(g)+10H2O(g)Complete the following table, showing the appropriate masses ofreactants and products. If the mass of a...
- Q 1. When 15.0 mL of a9.06×10-4M sodiumphosphate solution is combined with 15.0mL of a 4.38×10-4Mchromium(III) nitrate solution does a precipitateform?  (yes or no)For these conditions the Reaction Quotient, Q, is equal...
- Q The solubilities of the following salts are at a certaintemperature. Ag2SO4 0.03m, PbF21.0x10-3m, and BaC2O410-4m. Calculate the concentrations of all ions presentin each solution. Identify v, v_, and v+.Find m+/-...
- Q What are the surface functional groups on the stationary phasein normal phase LC and reverse phase LC. Write out the eluotropicseries for both normal phase LC and reverse phase LC...
- Q what are cofactors that are required by enzymes
- Q 1. To prepare your ascorbic acid solution, you and your labpartner dissolved 121.34 g of ascorbic acid in a beaker with 50.00mL of H2O. You and your lab partner then...
- Q Pertaining to the titration of 25.0mL of 0.100 M HCN(Ka=6.2x10-10) with 0.200 M NaOH, calculate the pH at the followingpoints. a) initial pH, 0.0mL NaOH b) after the addition of...
- Q Although argon makes up 0.93 percent of the atmosphere, the gasevaded discovery until 1894, when physicist Lord Rayleigh andchemist William Ramsey identified it. The clues for the discoveryof argon came...
- Q a clock maker has 15 clock faces. each clock requires 1 face and2 hands. If the clock maker also has 42 hands, how many clocks canbe produced? If the clock...
- Q Calculate the pH of the final equilibrium mixture in each of thefollowing solutions:1. 10 mL of 0.005 M HNO3 are mixed with 5 mL of 0.006M NaOH [answer: pH=2.87]2. One...
- Q A 7.70-L container holds a mixture of two gases at 35 °C. Thepartial pressures of gas A and gas B, respectively, are 0.190 atmand 0.891 atm. If 0.230 mol of...
- Q the Santa Ana winds are strong within SouthernCalifornia. what drives this phenomenon?(With respect to Gibbs and Helmholtz's eqn)Physical chemistry question
- Q For two dimensional particle in a box, how many electrons can weget at most in the first energy level and why?
- Q Please explain1) How does hydrogen bonding in water work? how does thishydrogen bonding affect density of ice vs water/surfacetension/capilary action2) How does the strength of the intermolecular forcesinfluence vapor pressure/melting...
- Q A) How many grams of solid sodiumfluoride should be added to 1.00L of a 0.218 M hydrofluoric acidsolution to prepare a buffer with a pH of 3.847?grams sodium fluoride=Â Â g.B)How many...
- Q How do you calculate the concentration in ppm from a gaschromatograph? The chromatograph is from a BTEX mixture and shows apeak for each component of the mixture. Bromobenzene was used...
- Q Chromium forms cubic crystals whose unit cell has an edge lengthof 288.5 pm. The density of the metal is 7.20 g/cm3. The atomicweight of Cr is 51.996 amu.a) Calculate the...
- Q [H3O^+(aq)]Drops of Stock SolutionsReaction TimeTest TubeKMnO4H2OH3O^+/H2SO4C2O4H2C-115255514mins 3 secC-215151558mins 10secC-31552553mins 8 seca)    What are the molecules and ions doingin solution – are they static or moving around? 
b)   Can ions or...
- Q A scientist dilutes 40.0 mL of a pH 5.85 solution of HCl to 1.00L. What is the pH of the diluted solution (Kw = 1.0 × 10â»Â¹â´)?
- Q A solution is made by mixing exactly 500.0 mL of 0.167 M NaOHwith exactly 500.0 mL of 0.100 M CH3COOH. Calculate theequilibrium concentrations of H3O+,CH3COOH, CH3COO-, OH-,and Na+.[H3O+] = M[CH3COOH]...
- Q Drops of Stock SolutionsTemp. (K)Reaction TimeTest TubeKMnO4H2OH3O^+/H2SO4C2O4H2E-11515155278 K3 min 1 secE-21515155300 K6 min 13 seca. What effect does the temperature of the solutions have on therate of the reaction? 
b....
- Q The complex ion Cu(NH3)42 is formed in a solution made of 0.0400M Cu(NO3)2 and 0.500 M NH3. What are the concentrations of Cu2 ,NH3, and Cu(NH3)42 at equilibrium? The formation...
- Q In the chemiluminesence reaction, a diene is generated on theluminol molecule. Why does the reaction not progress from thatpoint forward as a Diels-Alder reaction with molecular oxygenacting as the dienophile?...
- Q A solution containing 10.00 mL of 0.0500 M metal ion buffered topH = 10.00 was titrated with 0.0400 M EDTA. Calculate the fraction(αY4-) of free EDTA in the form Y4−....
- Q A rigid container has water of 2 kg at 120 C with a quality of25%. The container is heated to the temperature of 140 Celsius,calculate the new quality?
- Q HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO actsas a weak base. What is the pH of a solution that is 0.017 M...
- Q 1.For the reaction,PCl5(g) <-----> PCl3(g) +Cl2(g)Â Â Â Â Â Â Â Â Â Â Kp= 24.6 at 500 Kcalculate the equilibrium partial pressures of the reactants andproducts if the initial pressures are PPCl5 =0.610 atm, PPCl3 = 0.400 atm...
- Q Calculate the percent dissociation of HF (Ka= 3.5x10^-4) in(a) 0.050 M HF(b) 0.50 M HF
- Q Calculate enthalpy for the following reaction Ca(s) + 1/2O2 +CO2 = CaCo3 Given the following reactions: Ca(s) + 1/2 O2 = CaO (s)H= -635.1 kj CaCo3 = CaO (s) +...
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