Question

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

Answer 1

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

Step-by-step 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.