Chemistry question and answers for September 08, 2023
- Q Define the following concepts and provide an exaple for each:solid-liquid extraction, liquiid-liquid extraction, partitioncoefficient, miscible solvents, immiscible solvents.
- Q What is the concentration of hydronium ion, H3O + , in 0.10 MHClO at 25°C?A. 3.0 × 10−8 MB. 3.0 × 10−7 MC. 5.5 × 10−5 MD. 1.7 × 10−4...
- Q How can the peak area be used to quantitatively analyze a sampleusing GC?
- Q Consider the following question and answer.Give an example of a homogeneous mixture: \"WATER, because it ismade up of two different elements - hydrogen and oxygen, and thecomeposition is even throughout.\"Which...
- Q Remeber how you learned that a pure liquid distills within anarrow boiling point range, but that narrow boiling point doesntnecessarily imple a pure liquid? Keeping that lesson in mind,explain this:...
- Q What are two systematic and two random errors present in theexperimental procedure?
- Q 7) How many grams of boric acid should be used in compoundingthe following prescription: (4 points) Rx Lidocaine HCl 1% (E=0.20)Pilocarpine HCl 0.5 % (E= 0.24) Boric acid qs (E=0.52)...
- Q Consider the following reaction. It is occuring in a closedsystem and it is currently at equilibrium:2H2O(g) + Heat ↔ 2H2(g) +O2(g)  Label each of the following statements with is effect on...
- Q A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH.Determine the pH of the solution after the addition of 200.0 mL ofKOH. The Ka of HF...
- Q Calculate the enthalpy of the reaction 4B(s)+3O2(g)→2B2O3(s)given the following pertinent information:B2O3(s)+3H2O(g)→3O2(g)+B2H6(g), ΔH∘A=+2035 kJ 2B(s)+3H2(g)→B2H6(g),ΔH∘B=+36 kJ H2(g)+12O2(g)→H2O(l), ΔH∘C=−285 kJ H2O(l)→H2O(g),ΔH∘D=+44 kJ
- Q An air-purification method for enclosed spaces involves the useof \"scrubbers\" containing aqueous lithium hydroxide, which reactswith carbon dioxide to produce lithium carbonate and water:2LiOH(aq) + CO2(g) → Li2CO3(s) + H2O(l)...
- Q The ethyl mercaptan, C2H5SH, concentration in a mixture wasdetermined by shaking a 1.534-g sample with 60.0 mL of 0.01293 M I2in a tightly stoppered flask:2C2H5SH + I2 →2C2H5SSC2H5 +2I- +...
- Q Calculate the ph after mixing 100 ml of .075 M ammonium chloridewith 76 ml of .1 M LiOH
- Q A 0.120-L sample of an unknown HNO3 solution required 29.1 mL of0.200 M Ba(OH)2 for complete neutralization. What was theconcentration of the HNO3 solution?
- Q Using the particle in the 1-D box model, estimate the first 4energy levels of the π-network in hexatriene, C6H8(H2C=CH–CH=CH–CH=CH2). To calculate the box length, assume that themolecule is linear and...
- Q Coke can be converted into CO in following reaction CO2(g) +C(s) -> 2CO(g). A coke that contains 84% carbon by mass and thebalance noncombustible ash is fed to a reactor...
- Q How many moles of sodium hydroxide would have to be added to 250mL of a 0.436 M acetic acid solution, in order to prepare a bufferwith a pH of 4.630?moles
- Q How do you calculate the intrinsic viscosity of a polymersolution given only:1) Time for a solution to go through a viscometer2) Concentration3) Viscometer constant4) Density, viscosity, and time of water...
- Q Oliver likes to go fishing in the river by his house. One day henoticed that there was a white substance on some rocks at thebottom of the river. When he...
- Q Malonic acid (H2M) is a diprotic acid. You wish to prepare abuffer of malonic acid (pKa1 = 2.847, pKa2= 5.696) with a final pHof 2.90 but you only have disodium...
- Q Calcium Oxide (CaO) is widely used in the production of cement,steel, medicines and many other familiar materials. It is usuallyproduced by heating and decomposing limestone (CaCO3), a cheap andabundant material,...
- Q In an experiment where you standardize EDTA with calciumcarbonate and then have EDTA as the titrant and zinc as the analyteto determine the amount of zinc, which of the following...
- Q How many milliliters of 1.27 M KOH should be added to100. mL of solution containing 10.0 g of histidine hydrochloride(His·HCl, FM 191.62) to get a pH of 9.30?
- Q 3.36On March 11, 2011, a massive earthquake and tsunami triggered amajor disaster at Japan’sFukushima nuclear plant. A plume extending to the northwest ofthe site deposited significant amounts of iodine-131, cesium-134,and...
- Q Let's say you are going to titrate a 200 ml solution of 0.5M KOHwith a 0.1M solution of HNO3.a) What is the initial pH?b) Determine the pH when 300ml, 500ml,...
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