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 clear mystery liquids A, B, C and D. Her results for each well are: Liquid A: The solid dissolves quickly. Liquid B: The solid appears unchanged. Liquid C: The solid floats on top of the liquid. Liquid D: Fizzing occurs and the solid disappears. Which combination of solid plus liquid indicates a chemical change has taken place?

A chemical change is said to occur when there is an alteration in the composition of a substance. A chemical change simply means that the atoms of a substance has become rearranged and something new has been formed, different from the original substance present.

Now, we can know that a chemical change has occurred when;

A gas is evolved
Heat is absorbed or emitted
A solid suddenly appears in an aqueous phase reaction

The fizzling sound implies the evolution of a gas. The solid disappeared when the chemical reaction was complete.

Therefore, a chemical change occurred when a fizzing was heard and the solid disappeared.

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