A student 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?
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