Chemistry question and answers for September 18, 2023
- Q Congenital Galactosemia typically appears only in infantsbecause with maturation, most children develop another enzymecapable of metabolizing galactose. Its incidence is about 1 per18,000 births. If the infant does not receive...
- Q history of Nanotechnology
- Q A student states that sulfates are bad for our planet becausethey warm the planet. Now that you have a much greaterunderstanding of the chemistry of various molecules, please helpenlighten this...
- Q Biochemistry.What is the key substrate that nitrogen goes onto to enter theUrea Cycle?
- Q Compound (A) forms only proprionaldehyde (B) upon ozonolysis andreduction with (CH3)2S. Treatment of (A) with aqueous chlorineaffords (C) (C6H13ClO). Exposure of (C) to aqueous NaOH producesracemate (D) (C6H12O). (Think about...
- Q At STP how many grams of Mg are required to produce 245 mL of H2 in the reaction shown below?Mg(s) + 2 HCl(aq) → H2(g)+ MgCl2(aq)29 g0.266 g0.245 g245 gI...
- Q The following reaction forms 15.8 g of Ag:2 Ag2O---> 4 Ag + O2What total volume of gas forms if it is collected over water ata temperature of 25 and a...
- Q Suppose you carried out the catalyst trial. Could you calculate,from your data, the value of Eafor the reaction catalyzed by copper? If not, what additionalexperimental data would yourequire in order...
- Q the vapore pressure of ethanel ( C2 H5 OH) at 20 degree C is44mmHg and the vaper pressure of methol ( CH3 OH) at hte sametempature is 94mmHg. a mixture...
- Q Calculate the pH after 0.17 mole of NaOH is added to 1.06 L of asolution that is 0.54 M HCO2H and 1.16 M HCO2Na, and calculate thepH after 0.34 mole...
- Q 1) What volume of 17.4 M acetic acid should be used to produce0.100 L of 3.00 M acetic acid solution?2) Given the following thermochemical equation, how much totalenergy is released...
- Q b) Methoxide ion, CH3O , and amide ion, NH2 , are very strongbases commonly used in organic solvents. However, both basesare
- Q In a laboratory experiment, students synthesized a new compoundand found that when 11.77 grams of the compoundwere dissolved to make 253.3 mL of abenzene solution, the osmotic pressure generatedwas 3.94...
- Q Demonstrate by a “microstate analysis†that four electrons in adegenerate set of three pâ€orbitals gives rise to the sameelectronic state113 “terms†as two electrons do (i.e. 1D,1S and 3P)
- Q Starting with the 0.1250M Cu(NH3)+2 as the stock (concentration)calculate the following concentrations of the dilute solutionsshowing work:15mL stock diluted to 20mL10.0mL of stock solution diluted to 20.0mL5.0mL of the stock...
- Q A sample of an unknown gas with a mass of 4.67 goccupies avolume of 1.88 L at a pressure of 785 mmHg and a temperature of20.0 ∘C. Molar mass=57.9 g/mol....
- Q describe the benzene molecule and how its shape impacts itscharacteristics
- Q 2.5 grams of a metallic sample containing an unknown amount ofzinc is dissolved in 500 ml of acidic water, releasing the zincinto the water as Zn2+ ions. A 10.00 ml...
- Q A reaction is found to ahve a forward activation energy of 150kj and an exothermic enthalpy of reacton (delta H = -250kJ). FIndteh activaiton energy for the reverse reaction.
- Q Choose the answer which lists ionic compounds RbBr, SrCl2,SrBr2, and RbCl in order of increasing lattice energy (smallestlattice energy listed first). Be sure to show how you found thelattice energy...
- Q What am I doing wrong in this titration problem?Calculate the ph at the equivalence point for thefollowing titration 0.20M HCl versus 0.20M methylamine (CH3NH2).The Ka of methylammonium is 2.3x10^-11.First I...
- Q Find the pH of a solution prepared from 1.0 L of a 0.20M solution of Ba(OH)2 and excessZn(OH)2(s). The Ksp of Zn(OH)2 is3×10−15 and the Kf ofZn(OH)42− is 2×1015.
- Q Refer to the reaction 2Mg + O2---> 2MgOstarting amounts 1.25mg 2Mg, and 25g of O2. What are the changesthat occur in this reaction as its happening? Complete an ice tableusing...
- Q 1. An aqueous solution of sodium hydroxide isstandardized by titration with a 0.108 M solutionof perchloric acid.If 17.0 mL of base are required to neutralize29.4 mL of the acid, what...
- Q Which choice is expected to form (a) the strongest and (b) theweakest ionic bond (choices listed as strongest/weakest)?Options:Na+ & Cl-, Cs+ & Cl-, Cs+ & Br-, Ca2+ & Cl-,Ca2+ &...
- Q In the laboratory, a general chemistry student measured the pHof a 0.530 M aqueous solution of codeine, C18H21O3N to be 10.820.Use the information she obtained to determine the Kb for...
- Q Electric generating plants transport large amounts of hot waterthrough metal pipes, and oxygen dissolved in the water can cause amajor corrosion problem. Hydrazine (N2H4)added to the water avoids the problem...
- Q 1.True or false     A. All compounds that containhydrogen are acids..     B. A solution with a pH of 5 has10 times higher [H+] than a     Solution with a pH of 6.     ...
- Q Not counting solubility relations and effectiveness for removalof impurities, in whatrespects would hexyl alcohol be a lessdesirable crystallization solvent thanmethanol or ethanol (hint:look at MSDS physical and chemical properties)
- Q 1. 3. Consider the dissociation of acetic acid: CH3COOH(aq) +H2O(l) ⎯→ â†âŽ¯ CH3COO-(aq) + H3O+(aq) Ka = 1.8 x10-5   pKa = 4.74a. Write the equilibrium expression.b. Would the addition of...
- Q Fe(NO3)3+KSCN ---- FeSCN^2+KNO3the assumption was made that all of the SCN^- which had beenadded to the standard solutions had been converted to FeSCN^2+.Is this assumption reasonable. Explain considering the initialconcentration...
- Q Write the net ionic equation for the following reactions insolution.A) Solutions of lithium chromate and barium chloride aremixedB) Solutions of ammonium acetate and barium hydroxide aremixedC) Solutions of Acetic acid...
- Q What are glycosaminoglycans, and why are sugars good candidatesfor molecules that fill that role
- Q What volume of 6.00 M HNO3 is needed to make 500.0 mLof a 0.250 M solution?
- Q Substance Q reacts according to a first order rate law with k =5.0 x 10-5 s -1 .a. If the initial concentration of the reaction is 1.00 M for Q,what...
- Q howmany atoms or ions of each element are in 197g of BaSO4
- Q This is for the verification of beer-lambert law experiment.Volume of copper sulphate solution/mLVolume of Concentrate d ammonia/mLFinalvolume    ofsolution/mL[CuSO4]/mol dm-3[CuSO4]/pp m[CuSO4]/mg dm-3Transmit tance /%Absorbance02525101.50.0061242595.90.0182232589.90.0463222486.70.0624212581.40.090Can someone show one sample example of...
- Q a) Calculate the potential in the following cell (no current isflowing)Zn|Zn2+(1.00M)|| UO2 2+(1.00M),U4+ (0.1M), H3O + (1.00M) |Ptb) The cathode has a volume of 50 mL. What is the cell...
- Q Calculate the pH change when 10. mL of 3.0 M NaOH is added to500. mL of the following:(a) pure water(b) 0.10 M CH3COO-(c)0.10 M CH3COOH(d)a solution that is 0.10 M...
- Q To prepare a solution of NaCl, you weight out 2.634 (±0.002) gand dissolve it in a volumetric flask whose volume is 100.00(±0.08)mL. Express the molarity of the solution, along with...
- Q When a solid dissolves in water, heat may be evolved orabsorbed. The heat of dissolution(dissolving) can be determined using a coffee cupcalorimeter.In the laboratory a general chemistry student finds that...
- Q 1. What is the role of condenser used in the experiment ofisoteniscope method?2. How to know the filling the air into the system is finishedbefore taking off isoteniscope?
- Q If10.0 mL of 0.10 M HLac it's combined with 15.0 mL of 0.10 M NaLacand 6.0 mL of 0.20 M NaOH, what is the final pH?I have a hard time...
- Q Isolation, Purification & Synthesis methods of TItaniumTi6Al4V
- Q Explain in DETAILS how do EDTA displacement titration andindirect edta titrations work and the steps to do the calculationfor it (How to exactly find the moles of the ion in...
- Q describe the fundaments of the IR following technique (what doyou use it for?)
- Q Explain why the magnetic susceptibility of a transition metalcomplex is temperature dependent, whereas the magnetic moment ofthe complex is not temperature dependent.
- Q Can I get all of the question answered in a way that I knowunder which sub question the answer goes please.Can I get all of the questions answered in a...
- Q Give the concentration of each ion present in the solutionformed by mixing together these two solutions desribed. 51.7 mL of0.175 M Fe(NO3)3 and 23.7 mL of 0.509 M CaCl2
- Q How do you rate the acidity from highest to lowest for acids (carboxylic acids and alcohol) ?How do you rate nucleophilic strength ?How do you rate the reactivity of a...
- Q What is a “functional group†? Explain why infrared spectroscopycan often be used to detect the presence of a functional group in amolecule
- Q Why is the O-H and the N-H hydrogens not visible on the H NMR ofp-aminophenol reactant and acetaminophen product?
- Q Hydrogen sulfide decomposes according to the followingreaction,for which Kc = 9.30 multiplied by 10-8 at 700°C. 2 H2S(g)reverse reaction arrow 2H2(g) + S2(g) If 0.29 mol H2S is placed ina...
- Q A 24.7-g sample of white phosphorus was burned in excess ofoxygen. The product was dissolved in enough water to make 549 mL ofsolution. Calculate the pH of the solution at...
- Q The standard half-cell potential for the reactionO2(g)+4H+(aq)+4e−→2H2O(l) is+1.229 V at 298.15 K.The aO2 = 1.00 assuming that the aH+ is equal tothe molality.Part ACalculate E for a 0.100-molal solution of...
- Q 3. C (s) + H2O (g) → CO (g) + H2 (g) Le Châtelier's principlepredicts that increasing the volume of the reaction vessel will________.
- Q suggest an explanation following- The Cr and Ni content ofstainless steels used to make knife blades is different from thatused in the manufacture of spoons.
- Q Fora club that i am part of.we are making batteries using zinc, copper, activatedcharcoal, and water ( at the moment, but we are not limited tothese materials)Due to the size...
- Q 1. Sketch diagrams of a gas chromatograph and a high performanceliquid chromatograph. Label all the parts and describe their use inone sentence each. Why is HPLC so important to modern...
- Q If i have 1,000,000 gallons of water at a pH of 4.45 how manypounds of NaOH are need to raise this water to a pH of 7.8?Please show work.
- Q Ethylene oxide (C2H4O) is made by the catalytic reaction betweenethylene (C2H4) and oxygen.Fresh ethylene, pure oxygen, andrecycled ethylene are mixed to give a reactor feed gas containing55%C2H4 which enters the...
- Q Phosphoric acid, H3PO4(aq), is a triprotic acid. Calculate thepH and concentrations of H3O + (aq), H3PO4(aq), H2PO4 − (aq), HPO42− (aq), PO4 3− (aq), and OH− (aq) in a 0.100-M...
- Q Which of the following electronic transitions in a hydrogen atomwill be accompanied by the absorption of electromagnetic radiationof the longest wavelength?Group of answer choicesA. n = 3 → n =...
- Q Find the pH of a 0.170M HClO2(aq) solution.For HClO2, Ka=0.011.
- Q Using data from the table below, estimate the percentage ofchlorocyclohexane molecules that have theirsubstituents in an axial orientation at room temperature.Table 4.1 - http://imgur.com/ZLsHz5S,9ose7I0Figure 4.12 - http://imgur.com/ZLsHz5S,9ose7I0#1
- Q Determine the pH of a solution that is 3.55% KOH by mass. Assumethat the solution has density of 1.01 g/mL.
- Q In chemical reactions, heat is converted into chemical energy(the potential energy stored in chemical bonds) or vice versa. Bondenergy is the energy required to break one mole of the bond...
- Q In each of the following balanced oxidation-reduction equations,identify those elements that undergo changes in oxidation numberand indicate the magnitude of the change in each case.2MnO4−(aq)+3S2−(aq)+4H2O(l)→3S(s)+2MnO2(s)+8OH−(aq)  4H2O2(aq)+Cl2O7(g)+2OH−(aq)→2ClO2−(aq)+5H2O(l)+4O2(g)Ba2+(aq)+2OH−(aq)+H2O2(aq)+2ClO2(aq)→Ba(ClO2)2(s)+2H2O(l)+O2(g)
- Q Describe the stage of polymerization through which aphenolic resin passes to become thermoset.
- Q give the structure corresponding to the name(s)-4-chloro-2-pentyne
- Q Calculate ΔHrxn for the following reaction:CaO(s)+CO2(g)→CaCO3(s)Use the following reactions and given ΔH values:Ca(s)+CO2(g)+12O2(g)→CaCO3(s), ΔH= -812.8 kJ2Ca(s)+O2(g)→2CaO(s), ΔH= -1269.8 kJExpress your answer using four significant figures.
- Q derive butler-volmer equation from Arrhenius equationplease show all steps
- Q what is the degree of polymerization (DP) of LDPEhaving an average molecular weight (mass) of 27,980?
- Q Zinc metal reacts with hydrochloric acid according to thefollowing balanced equation. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When0.107 g of Zn(s) is combined with enough HCl to make 54.9 mL ofsolution in a coffee-cup calorimeter,...
- Q Calculate the pH of the following solutions.A.) 0.36 M NH4NO3B)0.50 M Ca(NO3)2C.)0.080 M C6H5NH2D.) 0.45 M KNO2
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