How would i calculate the expected final temperatures from and experiment using hot and cold water mixing them together to get the final temperature

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?

What are the similarities of physical and chemical change ?

Which formula can be used to calculate the molar mass of hydrogen peroxide