Chemistry question and answers for July 07, 2023
- Q At a certain temperature, the equilibrium constant for thefollowing chemical equation is 3.40. At this temperature, calculatethe number of moles of NO2(g) that must be added to 2.53 mol ofSO2(g)...
- Q What is the pH of a 0.11 M solution of C6H5OH (Ka = 1.3 x10^-10)?
- Q A beaker with 1.30×102 mL of an acetic acid bufferwith a pH of 5.000 is sitting on a benchtop. The total molarity ofacid and conjugate base in this buffer is...
- Q An electron, with a mass of 9.11×10−28 g is orbiting the nucleusof a hydrogen atom. A measurement determines the position of theelectron to within ±1.63 nm. The velocity of the...
- Q a. what role does temperature play in the solubility of acompound in a given solvent? what is the ideal situation forrecrystallization regarding a chosen solvent and temperature?b. when purifying a...
- Q How many grams of solid ammoniumbromide should be added to 1.00 Lof a 0.223 M ammonia solution toprepare a buffer with a pH of 9.990 ?
- Q H2O2 + FeSO4Is there a sign of reduction or oxidation of H2O2? Explaincarefully what is happening. Try to explain using half-rxn (Thereare 4 half-rxn involved when added together give the...
- Q Two solutions with the same concentration and the same boilingpoint, but one has bensene as the solvent and the other has carbontetrachloride as the solvent. Determine that molal concentration, m(or...
- Q What is the \"octet rule\" and what role does it play in Lewisstructures. Use the octet rule to predict Lewis structures for afew simple molecules such as ammonia (NH3), carbondioxide...
- Q a. what role does temperature play in the solubility of acompound in a given solvent? what is the ideal situation forrecrystallization regarding a chosen solvent and temperature?b. when purifying a...
- Q What role does water vapor pressure play in molar gasexperiements?
- Q FIND THE PH AN OH- OF EACH. (Round to the second decimalplace.)a. 5.0×10−2 M NaBrO.b. 8.0×10−2 M NaHS.c. A mixture that is 0.13 M in NaNO2 and 0.22 M in...
- Q a) Describe the specific reaction that occurs in each of thetests when they are positive by describing what happens chemicallyto give a blue-green solution in the Chromic Acid test (positivetest),...
- Q What role does the leaving group play on the rate ofSN1 versus SN2 reactions? (compare 1-bromo to 1 chloro, 2-bromo to2-chloro etc).What role does the structure of the substrates playon...
- Q What role does ATP Sulfurylase play in pyrosequencing?Â
- Q Calculate the pH after 0.017 mole of HCl is added to 1.00 L ofeach of the four solutions. (Assume that all solutions are at25°C.) (a) 0.128 M butanoic acid (HC4H7O2,...
- Q Howdoes locust bean gum impart spreadability, I.e., chemical reaction?Is it when it is used with xantham gum because they'resynergistic?
- Q For this important smog reaction the experimental rate law isr=kexp [NO]^2[O2]. a.) Show that the followingmechanism is consistent with the rate law and identify keepproposed mechanism. NO+NO<--> N2O2 fast k1/k-1...
- Q 3. For eukaryotes, the P/O ratio when NADH is used as asubstrate has been measured to be ~2.5 under optimalconditions.a) How does this P/O ratio relate to the number of...
- Q the structural fomula and fraction present calculated to threesignificant digits.a.citric acid at ph=2,6,10b.threonine at ph=2,6,10c.Glutamic acid at ph=2,6,10
- Q The pH of thewater is measured as 8.5 and the total concentration of carbonatespecies is found to be 0.00180M. Find the concentrations ofH2CO3,HCO3-andCO32-by bothgraphically and using the equations
- Q Tacticity of polymers and its influence on properties ofpolymers with specific examples
- Q What is the pH of a solution prepared by mixing 60.0 mL of 0.20Mpotassium carbonate (K2CO3) with 140.0 mL of 0.1M potassiumbicarbonate (KHCO3)? a. 6.43 b. 6.30 c. 6.67 d....
- Q The complete combustion of octane, a component of gasoline,proceeds as follows: 2 C8H18+25 O2 produces 16 CO2+18 H20 How manymoles of O2 are needed to burn 1.50mol of C8H18? Octane...
- Q Preparation of Copper(I) ChlorideReactions:1) Cu(S) + 4HNO3(aq) ->Cu(NO3)2(aq) + 2NO2(g) +2H2O(l)2) 2HNO3(aq) + Na2CO3(s) ->H2O(l) + CO2(g) + 2NaNO3(aq)3)Cu(NO3)2(aq) + Na2CO3(s)-> CuCO3(s) + 2NANO3(aq)4)CuCO3(s) + 2HCL(aq) -> CuCl2(aq) +H2O(l) +...
- Q The pH of thewater is measured as 8.5 and the total concentration of carbonatespecies is found to be 0.00180M. Find the concentrations ofH2CO3,HCO3-andCO32-by bothgraphically and using the equations
- Q In extracting the coconut oil which process will give a betterresults Cold process or Hot process?why?
- Q 1).State whether you agree or disagree with the following twostatements, and explain why using thermodynamic arguments:(a)Putting a lid on the pan of water whenheating it up would enable the water...
- Q 26.A solution of 0.075 M CoBr2 is saturated with H2S ([H2S] = 0.10 M). What is the minimum pH at which CoS ( Ksp = 5.9 x10 -21) will precipitate?Ka1...
- Q What mass of carbon dioxide is produced from the completecombustion of 2.50×10−3 g of methane?What mass of water is produced from the complete combustion of2.50×10−3 g of methane?What mass of...
- Q You are instructed to create 300. mL of a 0.34 Mphosphate buffer with a pH of 7.3. NaH2PO4 isthe acid component of the buffer. Na2HPO4 isthe base component of your...
- Q 1. Which of the following processes have a Q value atequilibrium which increases as the temperature increasesa) mixing of H2SO4 and H2Ob) dissolving of O2(g) in H2Oc) 2Cl(g) -> Cl2d)...
- Q If the heat of combustion for a specific compound is -1270.0kJ/mol and its molar mass is 27.33 g/mol, how many grams of thiscompound must you burn to release 200.00 kJ...
- Q mathematically and conceptually, describe how enthalpy andentropy a re competing forces
- Q calculate the % relative error in solubility by usingconcentration instead of activities for la(io3)3 in 0.05 mkno3
- Q 1. Write the balanced oxidation and reduction half reactions forthe reaction of As2O3^(3-) and I2. What ion is oxidized and whation is reduced?2. Assuming that 5 mL of 0.006 M...
- Q Show each arrow pushing mechanisms between silver nitrate inethanol with each of the following alkyl halides: 1-bromobutane,2-bromobutane, 2-bromo-2-methylpropane, bromocyclohexane,bromobenzene, and α-bromotoluene
- Q 1. Write the balanced oxidation and reduction half reactions forthe reaction of (As_2O_3)^3- and I_2. What ion is oxidized and whation is reduced?2. Assuming that 5 mL of 0.006M arsenite...
- Q A sample of Hydrogen gas, H2, has a volume of 8.56 L at atemperature of 0oC and a pressure of 1.5atm. Calculate the numberof moles of hydrogen gas in this...
- Q Let’s consider the dissociation of phosphoric acid H3PO4. Allfour possible protonation states, with H number from zero to three,must co-exist in equilibrium.H3PO4 <-> H2PO4- <-> HPO42- <-> PO43-pK1=2 pK2=7 pK3=12Find...
- Q What is meant with a ODE0D bleaching sequence?
- Q Problem 2 : Discuss the reasons for the differences inglass transition temperature for the following sets of polymerswith similar chemical structures. Be sure to write down thechemical structure in each...
- Q At a certain temperature the vapor pressure of pure heptaneC7H16is measured to be454.mmHg. Suppose a solution is prepared by mixing102.gof heptane and135.gof chloroformCHCl3.Calculate the partial pressure of heptane vapor above...
- Q A Witting Reaction of trans-CinnamaldehydeDescribe and explain the possible effect on your results of thefollowing experimental errors or variations.a. The lab assistant, thinking chlorobenzene and benzyl chlorideare different names for...
- Q An unknown mixture was analyzed using TLC on a silica gel plateand developed in 1:6 ethyl acetate:hexane, and gave 2 spots with Rfvalues of 0.6 and 0.5 respectively. 1)Would this...
- Q Order the following species from the one which binds lead (II)ions least strongly to the one which (at this pH) binds them moststrongly and leaves the smallest equilibrium concentration of...
- Q Which spectroscopy is more sensitive: fluorescence orabsorption? Why? (2) Between fluorescence and phosphorescence:which one has a higher intensity? Which one lasts longer?
- Q Find the structure of vanillin and suggest how one could extractthis compound from vanilla beans. Give a brief procedure specifyingkey points and solvent to be used.
- Q A solution containing 5.50 g of sodium carbonate is mixed withone containing 6.50 g of silver nitrate. After the reaction iscomplete, the solutions are evaporated to dryness, leaving amixture of...
- Q You wish to dispose of 100 mL of 0.1 M sodium phosphate buffer,pH 4.5. Where will you do this? Select all correctanswers in list.Mercury Spill KitBase Compatible Aqueous WasteAcid Compatible...
- Q Using a 0.25 M phosphate buffer with a pH of 6.7, you add 0.72mL of 0.45 M HCl to 49 mL of the buffer. What is the new pH of...
- Q A flask has a volume of 159.6 mL . When filled with air at apressure of 749.2 torr and a temperature of 25.54 ∘C, the flask andair have a mass...
- Q If your start the experiment with 0.500 grams of Nickel (II)Acetate Tetrahydrate, how many grams of Nickel (II) Formate shouldyou get, assuming 100% yield?
- Q The following data were obtained from a batch experiment for thereaction where A is converted to B.1)Determine the order of thereaction           Time (min)     0          10       20       40       60       80       100           A (mg/lit)       100     74       55       30       17       9         52) Consider a first order reaction...
- Q Draw an oxygen saturation curve for hemoglobin (pressure of O2versus saturation (y)) with physiological levels of CO2 and 2,3-BPGat biological pH. Now using arrows to indicate which direction itmoves, draw...
- Q a 0.5153g solid sample containing only a mixture of LaCl3 &Ce(NO3)3 was dissolved in water. Potassium iodate was then added tothe obtained solution producing the precipitates La(IO3)3 molarmass 663.61 g/mol...
- Q why are water and sodium bicarbonate extractions performed onthe reaction product? (Lab: synthesizing ester from carboxylic acidand alcohol)
- Q Please calculate the amount of acompound (A) that remains in 10 mL of an aqueous phase after threeextractions with toluene (10 mL each) if the partition ratio(KD) isa) KD =...
- Q NMR measurements have shown that poly-L-lysine is a random coilat pH=7 but becomes alpha helical as the pH is raised above 10.a) Why can NMR give this sort of information?...
- Q What test would you proform to identifying this clear liquidunknow? 2. Explain why you selected the test ? 3.if a substance isnot water soluble, the electrical conductivity test cannot be...
- Q Speculate on why polyester clothing is more wrinkle resistant thancotton. Why is a hot iron used to press out the wrinkles?
- Q The equilibrium concentration of hydroxide ion in a saturatedcobalt(II) hydroxide solution is ...................M.
- Q Calculate the pH of the solution that results when 15.0 mL of0.1650 M lactic acid is A) diluted to 45.0 mL with distilled waterB)mixed with 30.0 mL of 0.0825 M...
- Q A mixture of Na2CO3 and NaHCO3 has a mass of 82.0 g . It isdissolved in 1.00 L of water and the pH is found to be 9.92. Findthe mass...
- Q A twelve pack of your favorite beverage (12 fl. oz. cans) isplaced in a cooler at 70o F. How much heat must be removed (kJ) tocool the beverages to 37o...
- Q 1. Can trimyristin be classified as a saturated fat? (Considerthe structural feature present in unsaturated fats?)
- Q A 147-g sample of steam at 100 ∘C is emitted from a volcano. Itcondenses, cools, and falls as snow at 0 ∘C. (For water, 80. cal(334 J) is needed to...
- Q 1)Â Â Consider the titration of 50.0mL of 0.200 M HClO4 by 0.100 M NaOH. Complete the tablewith answers to the following questions:What is the pH after 35.5 mL of NaOH...
- Q Problem 20.51Given the following reduction half-reactions:Fe3+(aq)+e??Fe2+(aq)E?red=+0.77VS2O2?6(aq)+4H+(aq)+2e??2H2SO3(aq)E?red=+0.60VN2O(g)+2H+(aq)+2e??N2(g)+H2O(l)E?red=?1.77VVO+2(aq)+2H+(aq)+e??VO2+(aq)+H2O(l)E?red=+1.00VPart AWrite balanced chemical equation for the oxidation ofFe2+(aq) by S2O2?6 (aq).Express your answer as a chemical equation. Identify all of thephases in your answer.SubmitMy...
- Q Suppose you have a concentrated solution (S1) with aconcentration equal to 1 M. You use their solution to make moredilute solutions S2-S6. Complete the following table, whichdescribes the solution process....
- Q Consider the reaction: X2(g)→2X(g). When a vessel initiallycontaining 714 torr of X2 comes to equilibrium at 298 K, theequilibrium partial pressure of X is 116 torr . The same reactionis...
- Q Using the Equilibrium ConstantThe reversible chemical reactionA+B⇌C+Dhas the following equilibrium constant:Kc=[C][D]/[A][B]=4.6Part AInitially, only A and B are present, each at 2.00 M. What is thefinal concentration of A once equilibrium...
- Q Calculating Equilibrium ConstantsThe following reaction was performed in a sealed vessel at 752∘C :H2(g)+I2(g)⇌2HI(g)Initially, only H2 and I2 were present at concentrations of[H2]=3.75M and [I2]=3.00M. The equilibrium concentration of I2...
- Q CO(g)+H2O(g)⇌CO2(g)+H2(g)Kp=0.0611 at 2000 KA reaction mixture initially contains a CO partial pressure of 1360torr and a H2O partial pressure of 1768 torr at 2000K.Part ACalculate the equilibrium partial pressure of...
- Q One of the intermediates in the synthesis of glycine fromammonia , carbondioxide and methane is aminoacetonitrile C2H4N2.The balanced chemical equation is 3CH4+5 CO2 + 8NH3 ---> 4C2H4N2+10H2O. How much C2H4N2...
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