Chemistry question and answers for July 14, 2023
- Q A solution consists of 3.88 g benzene,C6H6 , and 2.45 g toluene,C6H5CH3. The vapor pressure of pure benzene at 20. °C is 75 mm Hgand that of toluene at 20.0...
- Q Describe the autoprotolysis of water. Include the relevantchemical reaction and the derivation of the autoprotolysisconstant.
- Q Electrophoresis & Sedimentation:Explain why a teardrop shaped particle would not have a smallerfrictional coefficient than a sphere. Why would a teardrop orelipsoid particle not possess superior streamlining compared to asphere?
- Q Electrophoresis & Sedimentation:Compare electrophoresis and sedimentation as methods forseparation of macromolecular mixtures. In addition, discuss themethods in terms of quantitative analysis of three-dimensionalstructure.
- Q ALREADY POSTED ONCE, ANSWERS WERE WRONG1. Calculate the concentration of a solution obtained when 15.00mL of 2.04 E-3 M KMnO4 is measured from a buret into a 50 mLvolumetric flask...
- Q Calculate the final concentration of each of the followingdiluted solutions:A) 0.50 L of a 4.0 M HNO3 solution is added to water so that thefinal volume is 8.0 LB) Water...
- Q Calculate the pH of a solution prepared by mixinga) 25.0 mL of 0.512 M NaOH and 34.0 mL of 0.187 M HClb) 46.0 mL of 0.235 M KOH and 50.0...
- Q PS11.6. Determine the pH of a buffer prepared by mixing 0.675moles of HC2H3O2 and 0.575 moles of NaC2H3O2 in enough water togive 1.00 liter of solution.Calculate the pH whena) 0.0500...
- Q imagine that you have developed a superpower that allows you tosee on the atomic level. At the atomic level, you are able to seeatoms and their interactions. Now imagine that...
- Q 1) Is there a relationship between starch and sugar contents andthe degree of ripening of bananas ? Explain in detail2) starch should give a negative result in benedicts (orfehling's) test;...
- Q A titration is performed by adding 0.791 M KOH to 40 mL of 0.127M HC3H5O2.a) Calculate the pH before addition of any KOH.b) Calculate the pH after the addition of...
- Q Discuss the mechanism of the Fries Rearrangement of PhenylAcetate to yield a mixture of 2 - and 4 - hydroxyacetophenone
- Q Calculate the free energy released when FADH2 is oxidized bymolecular O2 under standard conditions. Please show work
- Q Many first aid kits include an instant cold pack. A cold packutilizes a chemical reaction that has a significant change inenergy in order to make the pack feel cold. Explain...
- Q Part A) Calculate ΔHrxn for the reaction CaO(s)+CO2(g)→CaCO3(s)given these reactions and their ΔH values:Ca(s)+CO2(g)2Ca(s)++12O2(g)O2(g)→→CaCO3(s),2CaO(s),ΔH=−814.1kJΔH=−1269.8 kJ Express the enthalpy in kilojoules to one decimalplace.Part B)Calculate Δ Hrxn for the following reaction:CH4(g)+4Cl2(g)→CCl4(g)+4HCl(g)given...
- Q Consider the titration of a 28.0 −mL sample of 0.180 M CH3NH2with 0.155 M HBr. Initial pH is 11.95.Find:a) the volume of added acid required to reach the equivalencepointb) the...
- Q Part A) Charcoal is primarily carbon. What mass of CO2 isproduced if you burn enough carbon (in the form of charcoal) toproduce 5.40×102kJ of heat? The balanced chemical equation is...
- Q Each of the following mixtures is placed in a dialyzing bag andimmersed in distilled water. Which substances will be found outsidethe bag in the distilled water? Part A KCl solution...
- Q **showwork.                                 The density of a liquid whose boiling point is 55 to 57 degreesCelsius was determined to be 0.77+_0.05g/ml. What is theliquid?
- Q determine the total mass gain or loss for the reactionby comparing your initial mass to your final mass. combined mass ofvinegar and baking soda.initial total mass?final total mass?difference?run 1 grams...
- Q What is the pH of a 1.61M solution of carbonic acid? Ka1 = 4.3 x10-7 Ka2 = 5.6 x 10-11
- Q 1. A 5.88 kg piece of granite with a specific heat of 0.803 Jg-1 °C-1 and a temperature of 85.1 °C isplaced into 2.00 L of water at 19.0 °C....
- Q Which of the following redox reactions do you expect to occurspontaneously in the forward direction?Check all that apply.Al(s)+3Ag+(aq)→Al3+(aq)+3Ag(s)Cd2+(aq)+Co(s)→Co2+(aq)+Cd(s)Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)Pb(s)+Mn2+(aq)→Pb2+(aq)+Mn(s)
- Q Determine the mmol of both starting materials (factoring in thatformic acid is not pure, but rather 88% weight/volume, or 88g/100ml), showing your work. Determine the limiting reagent in thissynthesis. Lastly,...
- Q Part A) A sample of a gas at 25°C and 1.0 atmpressure has a volume of 2.5 L. The container is allowed to expanduntil the pressure is 0.85 atm and...
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