Chemistry question and answers for August 30, 2023
- Q 1) For a first-order reaction, after 230s, 33% of the reactantsremain. Calculate the rate constant for the reaction.2) A compound decomposes with a half-life of 80s and thehalf-life is independent...
- Q 1- does an alkyl substiuent in a ring favor the Friedel-Craftreaction?2- what is the advatage of using tetramethylthiourea?3 - what is the reagent(s) used for the thiolization of alkylhalides?4- what...
- Q 1. If the enzyme-catalyzed reaction E + S ↔ ES ↔ E + P takesplace near Vmax to the enzyme (E), what can be concluded about therelative concentrations of S...
- Q If 01.2 KOH is mixed with 0.05g of CO2 according to thefollowing equation, 2KOH + CO2 -----> K2CO3+ H2Oa. What is the limiting reactant? ______________________b. How many grams of K2CO3can...
- Q For each of the following, specify if a reaction does or doesnot occur when the two reagents are combined, and justify yourchoice of reaction or no reaction. For each combination...
- Q 1. The stopcock connecting a 1.00 L bulbcontaining krypton gas at a pressure of414 mm Hg, and a 1.00 L bulbcontaining oxygen gas at a pressure of792 mm Hg, is...
- Q You decide to construct a zinc/aluminum galvanic cell in whichthe electrodes are connected by a wire and the solutions areconnected with a salt bridge. One electrode consists of an aluminumbar...
- Q Explain why we need/want a large magnetic field in NMR based onthe following concepts:a. kT and the Boltzmann distributionb. the energy difference between the ground and excitedstatesc. the net magnetization...
- Q . What kind of materials properties can be inferred from theshape of the interatomic bonding energy vs interatomic distancecurves?
- Q You want to make a cheese sandwich with two slices of bread andone slice of cheese. For the following combinations state whetherthe limiting reagent is bread or cheese or neither.A....
- Q 20.0 mL of nitric acid (HNO3) solution is neutralized with 30.0mL 0.10M of potassium hydroxide (KOH) solution. what is theconcentration of nitric acid solution? The answer is 0.67 M but...
- Q Given that the specific heat capacities of ice and steam are2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion andvaporization for water are 6.02 kJ/mol and 40.6 kJ/mol,respectively, and...
- Q You need to prepare an acetate buffer of pH 6.50 from a 0.770 Macetic acid solution and a 2.85 M KOH solution. If you have 675 mLof the acetic acid...
- Q 1mol of an ideal gas is inside a cylinder with a piston under apressure of 6 atm. When reducing the pressure to 2 atm at constantT = 300K:(a) Who is...
- Q In all ligand titrations, the concentration of ligand isvaried around the KD of the complex. In a stoichiometric titration,what is the concentration of receptor in relationship to KD? Howdoes this...
- Q Calculate the change of enthalpy for: 4S + 6O2= 4SO3 Delta H=___ kJ
- Q What is the theoretical (minimum) number of equivalents ofmethylmagnesium iodide (CHMgI) needed for reaction with benzoin?How many equivalents of CH3MgI did you use relative to benzoin andwhy is this number...
- Q 3. Natural gas is a mixture of hydrocarbons and recentdevelopments in directional drilling and hydraulic stimulation hasseen that the majority of natural gas is now produced from shalegases. These gases...
- Q When light of frequency 4.96×1015 s-1shines on the surface of a metal, electrons are ejected with amaximum kinetic energy of 3.88×10-19 J.a) Calculate the wavelength of this light.b) Find the...
- Q The Destruction of Jericho The Bible describes the Exodus as aperiod of 40 years that began with plagues in Egypt and ended withthe destruction of Jericho. Archeologists seeking to establish...
- Q For each of the following octahedral complexes:a) determine the number of 'd' electrons on the metal atom.b) determine the number of unpaired electrons on the metalatom.c) calculate the magnetic moment...
- Q 7. a). Why should the core of most globular and membraneproteins consist almost entirely of α-helix and β-sheets?b). Name the structural and functional advantages of havingproteins with a quaternary structure.c)....
- Q A certain mineral used as a food preservative contains 8.242 %potassium, 5.687% aluminum, 5.099% hydrogen, 67.45 % oxygen and13.52 % sulfur. What is the empirical formula for thiscompound?
- Q Calculate the frequencies and energies for these 4 wavelengths:410 nm, 435nm, 487nm, 655nm
- Q 1.)in the laboratory, a general chemistry student measured the pH of a0.463 M aqueous solution of acetylsalicylic acid (aspirin), HC9H7O4to be 1.946.Use this info she obtained to determine the Ka...
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