Chemistry question and answers for July 30, 2023
- Q 1.Calculate the pH of a solutionobtained by mixing 100 ml of 1 M HEPES and 25 ml of 1 M NaOH andadjusting the volume to one liter with water.2. Calculate...
- Q 10.5. Provide the graphs for the Lineweaver-Burk forCompetitive, Non-competitive, and Un-competitive inhibitionanddescribe what occurs to Km and Vmax for each.
- Q In what direction will the water activity of a liquid foodchange (higher, lower, or virtually unaltered) if the followingchanges occur, keeping other factors constant? In each case give anexplanation.1. Addition...
- Q A phosphate buffer contains 0.075M K2HPO4and 0.125M KH2PO4. pKa values forH3PO4 are 2, 6.8, and 12.2. Calculate theconcentrations of:1.) H2PO4- concentration2.) H+ concentration
- Q What mass of hydrochloric acid (in grams) can be neutralized by2.2 g of sodium bicarbonate? (Hint: Begin by writing a balancedequation for the reaction between aqueous sodium bicarbonate andaqueous hydrochloric...
- Q Calculate the hydroxide ion concentration in a 0.0500 M NaOClsolution. The acid dissociation constant for HOCl is 3.0 x10-8.
- Q 2H2S (g) = 2H2 (g) + S2(g)When heated hydrogen sulfide gas decomposes according to theequation above. A 3.40g smple of H2S(g) is introducedinto an evacuated rigid 1.25 L container. The...
- Q For each of the following compounds, predict the energy barrierto rotation (looking down any one of the C-C bonds2,2-dimethylpropane & 2-methylpropane
- Q 3a. Consider the reaction when aqueous solutions ofchromium(II) nitrate and bariumiodide are combined. The net ionic equation for thisreaction is:3b. Consider the reaction when aqueous solutions of zincsulfate and iron(III)...
- Q 25.0 mL of a 1.00 M Fe(No3)2 solution was reacted with 25.0 mLof a 0.700M solution of K3PO4 to produce the solid Fe3(PO4)2 by thebalanced chemical equation3 Fe(NO3)2(aq)+ 2 K3PO4(aq)--->Fe3(PO4)2(s)+...
- Q A) how many grams of Zinc (II) Nitrate would be required toproduce 350 ml of a .50 M solution?Water is Unusual because...(Choose All true)- soilid phase is less compact than...
- Q An antifreeze protein, with a molecular weight of 17000 Da, wasfound to be present at a concentration of 10g dm-3 in the serum ofan Antarctic fish. calculate the expected depression...
- Q Why can the Drude equation not be applied in the range ofwavelengths near maximum absorbance?
- Q You work in a medical research lab with a biochemist who asksyou to make a 1.00 L phosphate buffer stock solution with pH = 7.4.The total phosphorus concentration is to...
- Q Three moles of an ideal gas expand isothermally and reversiblyfrom 90 to 300 L at 300 K.a) Calculate ΔUm, ΔSm, w per mole, and q per mole.b) If the expansion...
- Q Identify the hybridization of each interior atom ofCCl☰C-CH3?sp3,sp, sp3sp2,sp, sp3sp, sp,sp3sp,sp2,sp3sp3,sp, sp
- Q Answer all parts please! :)Sketch the d-orbital splitting for[Ru(bpy)3]2+, and populate it withelectrons.From part c (and consulting an appropriate Tanabe-Suganodiagram), how many d-d transitions are spin-allowed? List them.Sketch the excited-state...
- Q A certain volatile hydrocarbon (a binary compound of carbon andhydrogen) is found to be 92.3% carbon by mass. In a seperateexperiment, utilizing the Dumas method, a 4.00 mL pure liquidsample...
- Q a) How many moles of Cu are there in35.7 grams of Cu?b) How many MOLES of dinitrogentetrafluoride are present in 3.33 gramsof this compound ?c) How many ATOMS of nitrogenare...
- Q In order to separate the two dyes bound the column a solution isneeded with a substance that has higher affinity for the columnthan the dyes. Isopropyl alcohol is such a...
- Q Why do molecules absorb light? Why are only certain wavelengthsabsorbed?
- Q What is entropy (no measure of disorder, please)? How was itintroduced in science? What is its significance in chemistry?
- Q a) Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) isadded to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq)and 0.100 M in...
- Q Calculate the pH of a solution of 0.25 M Acetic acid and 0.34MSodium acetate before and after 0.036 M NaOH is added to thesolution. Ka of HAc = 1.8 x...
- Q Which of the following statements are FALSE regarding the Lewisstructures of XeFO3- and XeFO3+ ?Question options:The octet rule is violated in XeFO3+.There is a formal charge on O in XeFO3+.There...
- Q suppose that 100ml of 0.100 M Bacl2 is mixed with 100ml of 0.150M Na2SO4.what is pH of resulting solution ? when Ksp= 1.5 ×10^-9.I really want to understand systems of...
- Q For benzene, the total π-electron energy is Eπ = 6α +8β and for 1,3,5-hexatriene it is Eπ = 6α + 6.99β.(a) Using Huckel molecular orbital theory, compare the totalπ-electron energy...
- Q One mole each of CO 2 , O 2 , and N 2 are fed to a batch reactorand heated to 3000 K and 5.0 atm.Two reactions as shown proceed...
- Q A.What concentration of potassium hydroxide isneeded to give an aqueous solution with a pOH of3.720?Molarity of potassium hydroxide =B.What concentration of sodium hydroxide isneeded to give an aqueous solution with...
- Q 1. Determine the amount of heat (enthalpy) produced if 25.00grams of hexadecane is burned in excess oxygen to produce carbondioxide and water. Ensure that your answer includes the molecularformula and...
- Q 30.0 mL solution of 0.010 M piperidine (the active ingredient inhot pepper, the protonated form is a monoprotic weak acid with pKa=11.123) was titrated with 0.050 M HCl.  a) Find...
- Q How does a salt effect the pH of water? Please write at least 4sentences or more on the answer. Thank you.
- Q Explain thin layer chromatography and its utility in determiningthe components of a mixture. Be sure to briefly explain how TLCworks as well as what and how the visualization techniqueswork.
- Q Suppose you have the following reaction atequilibrium:                  C(s)+ 2H2(g) = CH4(g),  ΔH = −74.8kJ       What changes are expected to occur if the pressure of the systemwas increased? You may select multiple answers.The temperature...
- Q 0.10 g of Fe3O4 reacts with excess O2 to give Fe2O3 in 20.36%yield according to the following balanced equation. Calculate thetheoretical yield and the actual yield of Fe2O3(s).4Fe3O4(s) + O2(g)...
- Q 354 mL of 0.21 M formic acid HCOOH was mixed with 126 mL of 0.9M NaOH. What will be the final pH?
- Q The incredible length of biological polymers (sometimes tens ofthousands of monomers) often results in the formation of atertiary, 3-D structure. An example of this is in globularproteins. Which of these...
- Q What is the structural and functional difference betweenpolysaccharides and glycosaminoglycans
- Q An aqueous solution containing 34.2g of an unknown molecular(nonelectrolyte) compound in 143.1g of water was found to have afreezing point of -1.5?C. Calculate the molar mass of the unknowncompound.
- Q In 1783, Jacques Charles launched his first balloon filled withhydrogen gas, which he chose because it was lighter than air. Thisballoon, which had a volume of 31 000L at STP,...
- Q Â 1. Calculate the pH and the concentrations of all species present in a .0230 M HPO4- (Ka = 4.90 x 10-10)2. Calculate the pH and the concentrations of all species...
- Q Potassium oxalate is a monohydrate salt that forms colorless,odorless crystals. Oxalic acid is a diprotic acid with Ka1 = 5.4 x10-2 and Ka2 = 5.3 x 10-5 . (a) If...
- Q Suppose that 25.14 g of ice at -8.7°C is placed in 69.18 g ofwater at 98.1°C in a perfectly insulated vessel. Calculate thefinal temperature. (The molar heat capacity for ice...
- Q a) Of the chemical bonding types often found in minerals, whichis the strongest and which is the weakest? Why?b) Water molecules in ice are an example of what type of...
- Q A solution was prepared by dissolving 0.0258 mol disodiumphosphate in 500.0mL of deionized water. Phosphoric acid has thefollowing pKa values: pKa1 = 2.148 , pKa2 = 7.198 , pKa3 =12.375.a)...
- Q A reaction of 59.5 g of Na and 48.7 g of Br2 yields 57.1 g ofNaBr. What is the percent yield?
- Q Calculate ΔS if 2.10 mol of liquid water is heated from 0.00 ∘Cto 13.5 ∘C under constant pressure if CP,m=75.3J⋅K−1⋅mol−1.The answer the the problem above is 7.62 J/KThe melting point...
- Q Upon combustion, a compound containing only carbon and hydrogenproduced 0.660 g CO2 and 0.270 g H2O.Find the empirical formula of the compound.
- Q how does x-rays interact with atom in a crystal?
- Q Consider a 0.487 L solution of the amino aspartic acid (0.685M), which ahs a carboxylic acid group (pKa = 2.10), an amine group(pKa = 9.82), and a carboxylic acid side...
- Q When the contents of a 1000 cubic foot container full ofbasketballs is mixed with the contents of a 200 cubic footcontainer full of ping pong balls, the mixture does not...
- Q Trichloroethylene, a widely used degreasing solvent for machineparts is produced in a two-step reaction sequence. Ethylene isfirst chlorinated to yield tetrachloroethane, which isdehydrochlorinated to form trichloroethylene.C2H4 (g) + Cl2 (g)...
- Q For the reaction shown below, Kp = 0.148 at 37
- Q The osmotic pressure of an unknown substance dissolvedin 100 mL of water is measured at 298 K. The concentration of thissubstance is 25.5 kg m–3 and the osmotic pressure is...
- Q 1)A sample of He has a volume of 0.180 L, a pressure 0.800 atm and atemperature of 302 K. At what temperature (K) will the He have avolume of 90.0...
- Q Consider a system of distinguishable particles having only threenon-degenerate energy levels separated by an energy that is equalto the value kT at 25.0K. Calculate:1) the ratio of populations in the...
- Q Arrange the following compounds in order of increasing acidity,and explain the reasons for your choice of order: cyclopentanol,phenol, p-nitrophenol, and 2- chlorocyclopentanol.
- Q Identify the g or u character of bonding and antibonding sigmaorbitals formed by face-to-face overlap of d atomic orbitals
- Q Balance the following reactions in BASIC conditions. Show allsteps.1) Mg + NO3-1 ---> Mg +2 +N22) MnO4-1 + H2SO3---> Mn2+ + SO4-23) Cl-1 + MnO4-1--->ClO3-1 + MnO24) MnO4-(aq) +Fe2+(aq) --->Mn2+(aq)...
- Q The standard heat of formation of PI3(s) is -24.7 kJ/mol and thePI bond energy in this molecule is 184 kJ/mol. The standard heat offormation of P(g) is 334 kJ/mol and...
- Q The lab name is Electrochemical Determination of entropy ofmixingExplain briefly why complementary solutions were used in thisexperiment. How does this experimental design effectively simulatethe hypothetical reversible mixing process discussed earlier...
- Q a 374 ml container holds 0.146g of Ne and an unknownamount of argon at 35°C total pressure =638mmHg calculate moles ofAr present
- Q The activation energy for a particular reaction is Ea = 13.40kJ. What percentage of the molecules are at or above the activationenergy at 500.0 K?
- Q U-236 is an important neutron poison in reactors that is createdin uraniumbased fuels from U-235 capturing a neutron. Derive anexpression for the time at which the peak U-236 concentrationoccurs. Note...
- Q what is the difference betweeen theoretically determined andexperimentally determined molar massess. which one is moreaccurate?
- Q (a) Why does one have to ensure that a function is properlynormalized?(b) Normalize the function e-r over the interval 0≤ r≤ inf; 0≤ θ ≤ π; 0≤ ϕ ≤2π
- Q Two intracellular molecules A and B, are normally synthesized ata constant rate of 1000 molecules per second per cell. Thedegradation rate of A is 0.01/s and B is 0.1/sA}Write a...
- Q Which statements regarding shape and charge complementarity aretrue?1. Charge complementarity occurs when specific noncovalentbinding interactions occur between two contacting surfaces.2. The \"charge\" interactions can be charge-charge, H-bonding, orvan der Waals...
- Q Calculate the molarity and normality of the followingcompounds:a.80 μg/L HNO^3b.135 μg/L CaCO^3c.10 μg/L Cr(OH)^3 – Chromium(III) hydroxide will dissociate inwater to form a chromium ion and 3 hydroxide ions. The...
- Q Write a 1,050- to 1,400-word article based onyour notes. Include the following:Scene(s) identified that represent an application of DNAtechnologyScene(s) identified that could be used in an application of DNAtechnologyIdentification of...
- Q 1) A piece of magnesium weighing 2.00 gr. is dropped into 100 mLof 2.00 M H2SO4 when the reaction has ceased which of the reactantsremains in excess and by how...
- Q Determine the pH of each of the followingsolutions.Part A0.24 M KCHO2Express your answer to two decimal places.Part B0.22 M CH3NH3IExpress your answer to two decimal places.Part C0.21 M KIExpress your...
- Q I need a second set of eyes!! Does this makesense?Once glucose is placed in a baggie we placed indistilled water. We pulled a sample of water from the bottom of...
- Q How can electronegativity change themselves when in the PeriodicSystem moving vertically down through a main group (for a higheratomic masses) and horizontally in the system (for a higher groupnumbers)
- Q define and provide expamples for each of the following1) qualitative photochemistry2) quantitative photochemistry
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