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Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?O monitor for the release of a gasO observe a color changetest for the release of heatO conduct a test to determine the chemical makeup of the molecules

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Answer:

Conduct a test to determine the chemical makeup of the molecules. (last option)

Explanation:

A reliable way to observe if a chemical change has occurred is by performing a test to determine the chemical composition of the molecules, since if the chemical composition before the interaction of the substances is different after the interaction, a chemical change has occurred.

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