Chemistry question and answers for August 29, 2023
- Q In the laboratory, a quantity of I2 was reacted with excess H2to give 0.650 moles of HI. It is also known that the percent yieldof this reaction was 46.0%. How...
- Q The rate determining step in a reaction mechanism:A. is the fast stepB. is the slow stepC. is always the first stepD. is the transition state
- Q If you used the simple distillation to separate cyclohexane andtoluene, will it work? Why or Why not?
- Q 1) What is the pressure in a 18.2-L cylinder filled with 27.0gof oxygen gas at a temperature of 329K ?2) A gas mixture with a total pressure of 765mmHg contains...
- Q 1. Glucagon inhibits glycolysis in the liverbecause:a.) it increases the activity of Fructose-bisphosphatase 2b.) it causes a decrease in Fructose-2,6-bisphosphateconcentration c.) it decreases the activity of Phosphofructokinase-2d.) it causes a decrease...
- Q 2,3 BPG is quite abundant in red blood cells (~4.5 mM) and itmodulates the affinity of hemoglobin for oxgen. Briefly explainwhat BPG is doing to the affinity of hemoglobin for...
- Q 1)Use the balanced chemical equation below to calculate the massof KCl that is formed for every 164 L of O2(g) produced. You mayassume the reaction takes place at STP.2 KClO3(s)...
- Q One facet of the central field approximation for many-electronatoms is that inner-shell electrons screen the nuclear charge. Tounderstand how this works quantitatively, first note that theprobability distributions for electrons in...
- Q 1. Describe how you would prepare 1.50 L of a 0.500 M phosphatebuffer with a pH of 7.5. (show work)2. If 5.00 mL of 0.150 M HCl is added to...
- Q a)Assume the reaction 2Fe3+ + Sn2+ -> 2Fe2+ + Sn4+ has a ratelaw v = k[Fe3+][Sn2+]. If Fe2+ is produced at a rate of 0.12 molL-1 s-1 when the reactant...
- Q Hydrogen azide (HN3) is a shock-sensitive liquid, which means itexplodes when subjected to a physical shock. The HN3 moleculecontains two N-N bonds with bond lengths 113 pm and 124 pm....
- Q Calculate the pH values of the following solutions (youmust show the procedure of calculations:a-mole of formic acid and 0.02 mole of NaOH diluted to 1L.(formic acid pK=3.75).b-An aspartic acid solution...
- Q a start up company is trying to produce its own brand ofantibacterial ointment. it decides to analyze a generic brandalready on the market so that it can make suitable modification...
- Q 15.7 g of H2 gas is mixed with 294 g of I2gas in a 5.00 L tank at 25 ºC. The two gasses react to formhydrogen iodide gas by the...
- Q Give me two reasons for deviations from Beers’ law that wouldcause a nonlinear relationshipbetween absorbance and concentration. Explain why the deviationsfrom linearity occur.?
- Q Select a scientist, show how this person has contributed to ourunderstanding of an area of science.
- Q What is the concentration in % (v/v) of a methanol solutionprepared by mixing 35.0 mL of methanol with 700 mL of distilledwater?
- Q Â Â Â Â Â Â Â Â Gaschromatography questions1. why is GC separation more efficient than afractional distillation?2. what characteristics must the liquid stationaryphase have?3. how do the flow rate of the carrier gad and thecolumn...
- Q What things would 2 isotopes of the same elements have in common;and how are isotopes different from ions
- Q The Ka of propanoic acid (C2H5COOH) is 1.34 × 10-5. Calculatethe pH of the solution and the concentrations of C2H5COOH andC2H5COO– in a 0.551 M propanoic acid solution at equilibrium.
- Q When 15.0 mL of a 9.86×10-4 M magnesium sulfate solution iscombined with 22.0 mL of a 6.62×10-4 M potassium carbonate solutiondoes a precipitate form? yes (yes or no) For these...
- Q A solution of glucose (C6H12O6)is prepared by dissolving 100.0 g of glucose in 1000. g of water.The density of the resultant solution is 1.050 g/mL. Kb for wateris 0.52 oC/m...
- Q Consider a 0.10 M solution of a weak polyprotic acid (H 2 A)with the possible values of K a 1 and K a 2 given below. Calculatethe contributions to [...
- Q Unit 6 Lab - Temperature Effects ofEquilibriumPhoto DocumentationIn order to earn full credit for the participation portion ofthis activity, you must submit at least 2 photos.Required photos are outlined in...
- Q Which of the following is generally true regarding the impact ofthe reduced speed limit?(a) It always reduces the atmospheric emissions fromvehicles(b) Whether it reduces the emission depends on the types...
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