Chemistry question and answers for September 13, 2023
- Q Question 1.An environmental scientist isolates a pollutant (compound X)from a factory’s effluent stream and dissolves it in water.Experiments are then conducted using liquid – liquid extraction tooptimize its extraction. Using...
- Q State the theory and explain how NMR and IR spectroscopywork.
- Q Studentsperforming vinegar analyses made several mistakes in theirexperiments. Explain in detail how each error below will affect thefinal result (% weight of acetic acid in vinegar) of each student'sexperiment. Show...
- Q Mass (g) of salicylic acid2.0083Volume (mL) of acetic anhydride used3.01Mass (g) of filter paper0.4629Mass (g) of watch glass29.6710Mass (g) of watch glass, filter paper andaspirin30.5178Mass of aspirin: 0.3839Maximum amount (g)...
- Q Heavy water, symbolized D2O (D = 2H) finds use as a neutronmoderator in nuclear reactors. In a mixture with ordinary water,exchange of isotopes occurs according to the following equation:H2O+D2O⇌2HDO Kc...
- Q Therate of reaction is enhanced in the presence of light. What doesthis imply?
- Q What are the differences between polyamides and proteins ? I)Polyamides are unable to undergo hydrogen bonding betweenindividual polymer chains. II) Polyamides usually do not havehydroxyl- or thiol-groups as side chains....
- Q A scientist measured theproperties of a newly synthesized gas molecule. At 55.00 degrees Cand 2.090 atm, the specific volume is found to be 0.4947L/g.A) Using the ideal gas law, find...
- Q Upon graduation, in a misguided attempt to pay off your studentloans more quickly you become involved in the trade of illicitnarcotics. Your usual supplier gets eliminated by the competitionand you...
- Q Bonding is at the heart of chemistry. In chemical reactions,bonds are broken and new bonds are made. Individual atoms breakfree from their original bonding partners and interact and formbonds with...
- Q Determine whether each of the following statements is true orfalse. If the statement is false, modify and rewrite it so that itis a true statement.a. When a molecule has two,...
- Q Which of the following set of quantum numbers (ordered n, â„“, mâ„“,ms) are possible for an electron in an atom? Check all thatapply.3, 3, 1, -1/24, 2, -2, 1/2-3, 2,...
- Q What does it mean when we say that a 0.15 M NaCl solution isisotonic with blood, whereas distilled water is hypotonic?
- Q In a calorimeter, we added 50 mL of 1M HCl to 50 mL of 1.1 M NH3which produces NH4Cl. If the temperature increased 5.0 degreesCelsius, what is the molar enthalpy?...
- Q (a) What does the term population inversionrefer to with respect to a laser and (b) why ispopulation inversion required for light amplification to occur?
- Q what concentration of Zn^2+ will remain when 200mL of 4.50*10^-3M Zn(NO3)2 is combined with 200.0mL of .250 M NaOH? Kf of Zn(OH)4^2- = 2.0*10^15
- Q Radioactivity lab using equation age=1/k ln(1+D/P)k=decay constant; D= # of daughter atoms in sample (beans); P= #of parent atoms in sample (M&M's)if you found a container with 20 M&M's and...
- Q Calculate the concentrations of all species in a .377M Na2CO3solution [CO32-]= [Na+] = [OH-]= [H+]= [HCO-3]= and [H2CO3]= SHOWALL WORK PLEASE
- Q For each of the compounds described by the following names:1. Draw a three-dimensional representation.2. star(*) each chirality center.3. draw any planes of symmetry.4. draw any enantiomer.5. draw any diastereomers.6 label...
- Q 1: Discuss the vaporization of water in standard condition at298 K in term of: -1A exothermicity and endothermicity -1B changeof entropy of the system and the surrounding -1C spontaneity of...
- Q 5.20L of an ethylene glycol/water mixture in a car radiatorreleases 3520 kJ of heat. If the final temperature of the ethyleneglycol/water mixture is 25.0°C, what was the initial temperature ofethylene/glycol...
- Q A buffer contains 0.10 mol of propionic acid (C2H5COOH) and 0.19mol of sodium propionate (C2H5COONa) in 1.20 L.Part A. What is the pH of this buffer?Part B. What is the...
- Q Write the balanced half-reactions of the following types ofbatteries :(oxidation and reduction both)a. Alkaline dry cellb. Nickel-Metal Hydride batteryc. Zinc-air batteryd. Lead storage battery
- Q Pure (100%) sulfuric acid has a density of 1.84 g/ml. How manymL of sulfuric acid need to be diluted with water to a total volumeof 500 mL to prepare a...
- Q 4. calculate the Eocell for the Ni - Al cell.For the Ni - Al cell in question 4 write the followingreactions5. Cathode Half Reaction:6. Anode Half Reaction:7. Redox Reaction:8. Using...
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