Chemistry, 26.10.2019 08:43 alananicoleee
Penicillin. an important antibiotic (antibacterial agent), was discovered accidentally by the scottish bacteriologist alexander fleming in 1928, although he was never able to isolate it as a pure compound. this and similar antibiotics have saved millions of lives that would otherwise have been lost to infections. penicillin, like many of the molecules produced by living systems, is a large molecule containing many atoms. one type of penicillin, penicillin f, has the formula c14h20n2so4. compute the mass percent of each element in this compound.
Answers: 2
Chemistry, 22.06.2019 15:00
Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.
Answers: 2
Chemistry, 22.06.2019 20:20
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa
Answers: 2
Chemistry, 22.06.2019 22:00
4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.
Answers: 2
Penicillin. an important antibiotic (antibacterial agent), was discovered accidentally by the scotti...
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