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43:10
Which pair of elements can be used to determine the age of a fossil that is over one billion years old?

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?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

In saturated organic compounds, all the bonds between carbon atoms are called?