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Evolutionary theory suggests the RNA was the basic building block of life before DNA and proteins. What are the advantages to having DNA, RNA and protein compared to only RNA?
A solution contains 0.010 M silver ion and 0.0010 M lead(II). Sodium sulfate is dissolved to give a nominal concentration of 0.0010 M sulfate. Does a precipitate form?
When Pb(NO3)2(aq) is mixed with NaCl(aq), a precipitate of PbCl2(s) is formed as well as NaNO3(aq). A solution containing 8.00 grams of Pb(NO3)2is mixed with a solution containing 2.25 grams of NaCl. What is the maximum amount of PbCl2(s) that will f..
1.9 kJ f heat is added to a slug of rhodium and a separate 1.9 kJ of heat is added toa slug of zinc. The heat capacity of the rhodium slug is 318 J/ degree C while the heat capacity of the zinc slug is 996 J/ degree C.
The annual production of zinc sulfide (ZnS) is 3.5 10^4 tons. Estimate the number of tons of SO2 produced by roasting it to extract zinc metal.
How do fluorescent dyes, like pyranine, change their structure when the dyes intensity changes, and they change brightness?
Use the appropriate values of Ksp and Kf to find the equilibrium constant for the following reaction: FeS(s)+6CN^-(aq)->
chlorine dioxide clo2 si a reddish-yellow gas that is soluble in water. in basic solution it gives clo3- and clo2-
The temperature of the calorimeter increased to 54.080C. Calculate the ?H for the reaction. You may assume the butter is pure glyceril tristearate (C57H110O6).
what is the minimum number of photons you would need to interact with these atoms in order to have all of their electrons promoted to the n = 3 level? What wavelength of light would you need to perform this experiment
Also explain the basics of the characteristics of voltaic and galvanic cells.
What is the pH of a solution made by mixing 25.00mL of 0.200M CH3COOH with 10.00mL of 0.200M NaOH? Ka of acetic acid is 1.8 x 10^-5.
the atomic masses of 6Li and 7 Li are 6.0151 amu and 7.0160 amu. Calculate the neutral abundance of each isotope. The average atomic mass of Li is 6.941 amu
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