Question

You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but substance B does not. What most likely happened in this situation? A chemical change occurred in both substances. A physical change occurred in substance A, and a chemical change occurred in substance B. A physical change occurred in both substances. A chemical change occurred in substance A, and a physical change occurred in substance B.

Answer 1

The reason why A returned to its original color but B did not is because; A  chemical change occurred in substance A, and a physical change occurred in substance B.

A chemical change results in a change in the "composition" of a substance. When the composition of the substance changes, the change is often irreversible.

A physical change does not alter the composition of a substance hence a physical change is easily reversible.

Since A did not return to its former color, it underwent a chemical change while B underwent a physical change since it returned to its former color.

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