Where dose most of the evaporation on earth occur

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

How many grams are in 68.2 molecules of br2?

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?