Astudent takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of mystery liquids a, b, c and d. her results for each well are:
the solid dissolves quickly in liquid a.
the solid remains unchanged with the addition of liquid b.
the white solid remains, but dissolves very slowly in liquid c.
when liquid d is added, fizzing occurs and the well becomes warmer.
in which well does a chemical change occur?