An ore sample is known to contain copper sulfate pentahydrate, CuSO4•5H2O. If a 9.661 g sample of the ore loses 1.0447 g of water when heated strongly, what is the maximum mass, in grams, of CuSO4•5H2O that could have been in the sample? (MW of CuSO4•5H2O = 249.55 g/mol)

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?