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Double-stranded DNA standards and an unknown were electrophoresed in a 0.6% agarose gel, stained with ethidium bromide and photographed under UV light. The negative of the photographed separation pattern was then scanned with a densitometer. The following data were obtained. Estimate the length of the unknown DNA, in base pairs.
The following data were obtained when a Ca2+ ion-selective electrode was immersed standard solutions whose ionic strength was constant at 2.0 M.
a compound that contains only c and h was burned in excess o2 to give co2 and h2o. when 0.270 g of the compound was
Atoms of an unknown element have the following masses and percent abundance: 90.92% of the atoms have a mass of 19.988 u, 0.26% of the atoms have a mass of 20.983 u, and 8.82% of atoms have a mass of 21.978 u.
If 75 g of liquid water (C = 4.18 J/g-oC) in a calorimeter changes temperature from 25°C to 75°C, how much heat was transferred? Use the equation C = q/mT.
Which of the following compounds can exhibit geometric isomerism (has cis-trans isomers)?
What is the atom economy of this process if aspirin is considered to be the desired product. Enter your answer as a percentage, to the nearest tenth of a percent.
The reaction takes place at around room temperature in solvents such as. The specific rate constant at 293 is found to be and at 303 the specific rate constant is found to be.
How would the geometry of the product (isoborneol) change (OH in an endo or exo position) if all the methyl groups of camphor were replaced with H
If it takes 6.5 seconds for 25 cm3 of helium gas toeffuse through a pinhole into a vacuum, how long would it take for25 cm3 of CH4 to escape
nitrogen is contained in a 300 ml vessel at 400 mm hg and 10degc. how many grams of nitrogen are in the
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 18.0 g to 100°C in boiling water and then dropped the hot coin into 26.5 g of water at T = 16.5°C
Some suggest that the Piltdown Man episode points to the scientific method at its worst and its best. What do they mean by this?
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