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the half-life of a certain radioactive element is 800 years. how old is an object if only 12.5% of the radioactive atoms in it remain?

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

Summarize possible ways in which phases of matter could combine to form a solution.

How many moles of kci are produced from 2.50 moles k