Two identical beakers each contain 250 ml
of water. the temperature of the water is
85°c in one beaker and 15°c in the other
beaker. a drop of red food coloring is placed
in each beaker at the same time.
during the first minute, which of the
following is most likely to happen?

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?