The radioactive isotope 19O, prepared by neutron irradiation of 19F, has a half life of 29 s. What percentage of a freshly prepared sample of 19O remains after 2.00 min

Nan element’s square on the periodic table, the number with the greatest numerical value represents the

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Which would freeze at a higher temperature: the great salt lake or lake tahoe? a. lake tahoe would freeze at a higher temperature. b. the great salt lake would freeze at a higher temperature. c. both lakes would freeze at the same temperature.