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Chemistry question and answers for August 13, 2023

Q What enables PCR to amplify just one location (locus) in aperson's genome as opposed to several loci scattered throughout thegenome (what gives PCR its specificity)?

Q List a few terms that are unique for regulation of transcriptionin eukaryotic cells.

Q Calculate the pH and [S2âˆ’â€‰] in a 0.13 MH2S solution. Assume Ka1 =1.0â€‰âœ•â€‰10âˆ’7; Ka2 =1.0â€‰âœ•â€‰10âˆ’19.

Q A student designs an ammeter (a device that measures electricalcurrent) that is based on the electrolysis of water into hydrogenand oxygen gases. When electrical current of unknown magnitude isrun through...

Q (A) Calculate the molarity of commercially availableconcentrated nitric acid reagent given the following data:Molecular formula: HNO3Molar mass = 63.01 g/molPurity/Reagent Concentrate: 70.9% (w/w)Specific gravity @20 degrees Celsius = 1.423(Hint: Using...

Q How can you distill and purify a compound at temperature belowits normal boiling point?

Q Consider the he kinetics data below. Note that two reactionswere studied. Use the information to calculate the EQUILIBRIUMCONSTANT forÂ Â Â Â Â Â Â Â Â Â Â 2 NOCl (g) -> 2NO(g) + Cl2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â [NO]Â Â Â Â Â Â Â Â Â Â Â Â Â Â [Cl2]Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â initial rateÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.10MÂ Â Â Â Â Â Â Â Â Â Â Â 0.10MÂ Â Â Â Â Â Â Â Â Â Â Â 0.54M/sÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.10MÂ Â Â Â Â Â Â Â Â Â Â Â 0.20MÂ Â Â Â Â Â Â Â Â Â Â Â 1.05M/s2NO(g) + Cl2(g) ->2NOCl(g)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.10MÂ Â Â Â Â Â Â Â Â Â Â Â 0.30MÂ Â Â Â Â Â Â Â Â Â Â Â 1.62M/sÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.10MÂ Â Â Â Â Â Â Â Â Â Â Â 0.40MÂ Â Â Â Â Â Â Â Â Â Â Â 2.16M/sÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.20MÂ Â Â Â Â Â Â Â Â Â Â Â 0.50MÂ Â Â Â Â Â Â Â Â Â Â Â 10.8 M/sÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.30MÂ Â Â Â Â Â Â Â Â Â Â Â 0.50MÂ Â Â Â Â Â Â Â Â Â Â Â 24.3...

Q Write and balance the equation for the complete combustion ofethane, C2H6.

Q Deterime the % of Acetic Acid in vinegar in your kitchen. Showhow to determine it in words and make up random numbers tocalculate it also.Determine the purity of an Aluminum...

Q Pre-Laboratory Questions (An Acid Base Titration)1. Show the reaction between HCl and NaOH. Label the acid, base,and each of the products.2. What occurs at the equivalence point?3. Consider the titration...

Q Chemical engineering questionA synthesis gas containing 6.4% CO2, 0.2%O2, 40.0% CO and 50.8% H2 (the remainder isN2) is burned with 40 % excess dry air (assume 21 %O2 and 79...

Q A 10.0mL sample of calcium hydroxide solution required 26.85mLof 0.225M hydrochloric acid for neutralization.Calculate the molar concentration of the base.2HCl(aq) + Ca(OH)2(aq) -> CaCl2(aq) + 2H2O(I)

Q The decomposition of solid ammonium hydrogen sulfide to formammonia gas and hydrogen sulfide gas is an endothermic process.A6.1589-g sample of the solid is placed in an evacuated 4.000-Lvessel at 24.00C.After...

Q The reaction SO2(g)+2H2S(g) â‡Œ 3 S(s)+2H2O(g) is the basis of asuggested method for removal of SO2, a pollutant that irritatesairways causing coughing, from power-plant stack gases. The valuesbelow may be...

Q The OH radical is important in the daytime chemistry reactionsin the formation of air pollutants.(which one is correct?)A.it is formed from nitrous acidB. it reacts with hydrocarbonsC. it is formed...

Q For toluene determine:a) Vapor pressure at 100 Â° C.b) Its boiling temperature at a pressure of 530 torr.c) Draw the liquid-vapor equilibrium curve from 13 to 136 Â° C.

Q 1. If 14.95 mL of a 0.1250 M HCl solution is added to reach theendpoint of a titration, how many moles of HCl have been added?0.001869 moles0.008361 moles8.361 moles0.1196 moles1.869...

Q (a) Calculate the percent ionization of 0.00710 M butanoic acid(Ka = 1.5e-05). % ionization = % (b) Calculate the percentionization of 0.00710 M butanoic acid in a solution containing0.0210 M...

Q 1. Potassium hydrogen phthalate is a solid,monoprotic acid frequently used in the laboratory to standardizestrong base solutions. It has the unwieldy formula ofKHC8H4O4. This isoften written in shorthand notation as...

Q During the metabolism of amino acids,amino groups are often switched from one organic compound toanother through a process called transamination. The following aretwo examples of transamination reactions with their correspondingfree...

Q Why does krypton form crystals at sufficiently low temperaturesdespite having nopermanent dipole moments?

Q Consider the titration of 39.2 mL of 0.260 M HF with 0.215 MNaOH. Calculate the pH at each of the following points.A. Calculate the pH after the addition of 9.80...

Q Explain tactility using poly(acrylonitrile) as an example.

Q An air bottle used for scuba diving breathing apparatus has avolume of 30 l. After it has been used, the pressure andtemperature of the remaining air in the bottle are...

Q A solution is 5 mM in each of the following ions:numberionKsp of M(OH)21Mg2+1.8e-112Cd2+2.5e-143Co2+1.6e-154Zn2+4.4e-175Cu2+2.2e-20Indicate which of the metal ions would precipitate (or start toprecipitate) at each of the following pH values....

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