Chemistry question and answers for September 11, 2023
- Q How many grams of urea [(NH2)2CO] must be added to 400 g ofwater to give a solution with a vapour pressure 2.50 mmHg less thanthat of pure water at 30°C?...
- Q Write down the series of oxygen-only chemical reactions relatingto the formation and destruction of ozone in the stratosphere.Describe the role of each individual reaction and indicate howChapman could use them...
- Q In a 4.50L sealed, evacuated flask, Robert injected 2.25g ofliquid water and then heated it up to 50.0°C, while measuring the pinside. When the system stabilised, p total = 196.0mmHg....
- Q Describe what is meant by the term “greenhouse effectâ€. Indicatewhich species make the greatest contribution and describe theirnatural and manmade sources. Explain why the major components ofair are ineffective greenhouse...
- Q Howcan I give reference to Hydrogen and Hydronium ions when writtingabout the usuage of a universal indicator.
- Q Surfactants form inverse micelles in nonpolar solvents.a) Why?b) Why is it difficult to determine the CMC of a surfactant in anonpolar fluid by measuring its surface tension?
- Q An aqueous solution contains 5.8% KBr by mass.Calculate the molality of the solution.Calculate mole fraction of the solution.Please help
- Q How can you distinguish polyethylene from polypropylene based ontheir spectra? Give specific differences both in the C-H region andin the C-C region. What functional group is this attributed to inits...
- Q can someone provide me the constitutional isomers of c5h12f2?can you also provide the name of the isomers? Thank you so much
- Q An unknown molecule contains only sulfur atoms. Suppose 1 L ofvapor of this 20) molecule is reacted with sufMicient oxygen at 1atm and 500 °C to produce 8 L of...
- Q Consider the titration of a 28.0 mL sample of 0.175M CH3NH2 witha 0.145M HBr. Determine each of the following.I already got initial pH: 11.94 and the volume of added acidrequired...
- Q 2 SO3 (g) → 2 SO2 (g) + O2 (g) A sample of 2.0 mole of SO3 (g)is placed into an evacuated 2.0 L container and heated to 700K. Thereaction...
- Q Provide a practical application of gelling properties ofpolysaccharides used in medical and industrial setting, anddescribe the mechanism of gelling for the application mentionedusing a diagram.
- Q Given a 0.1 M NH4Cl solution: a) Which is the pH of thissolution? b) If 100 mL of 0.1 M HCl solution are added to 100 mL ofthe original solution,...
- Q You need to increase the dissolution rate of a slightly watersoluble drug in tablet form. Propose three different solutions tothis problem and explain why each of your solutions will solve...
- Q This is all one question, but it is broken into severalparts.What is the difference between Raman scattering and IRabsorption? Explain it using an energy diagram.What is a difference between the...
- Q When an energetic electron with the velocity of 1.00 x 106 m s-1was collided with Rb atom (assume stationary), Rb- anion moves at313 m s-1 and released 382.4 nm of...
- Q 1. Which is more dangerous if you spill it on your hand a 0.025M HBr solution (Ka = 1.3 x 106 ) or 0.75 MHClO2 solution (Ka = 1.2 x...
- Q What is the pH of 0.51 M diethylammonium bromide,(C2H5)2NH2Br.The Kb of diethylamine,(C2H5)2NH, is 6.9 x10-4.
- Q suppose that you repeated PART B of the experiment using1M HNO3(aq). How would you expect the â–³Hneut to compare with thatfor the neutralization of HCL? explain.â–³H = Hfinal - Hinitial...
- Q For all cycles in this section, assume that you have exactly1.000 moles of gas and that the cycle is run reversibly. The knownstate parameters for the cycle will be given...
- Q explain what neighboring group participation is. And what effectsit can have in substitution reactions
- Q what is the importance of oxopiperazine
- Q If you use a strong base in high concentration to run thebenzoin condensation, you will probably find that the product isnot benzoin, but rather benzoic acid and benzyl alcohol. What...
- Q 65. Because carbon and silicon are bothelements in group 14 on the periodic table, we expect them to reactwith other elements in similar ways. To some extent, then do, butin...
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