When an atomic nucleus stays together

What three natural resources are found in the great lakes region

What is the percent by mass of magnesium sulfate in mgso4.7h2o

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?