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? (1 point) monitor for the release of a gas test for the release of heat observe a color change conduct a test to determine the chemical makeup of the molecules

Explanation:

Release of gas, heat, or color change can be due to physical changes too. The most reliable way to confirm a chemical change is to test the chemical makeup of molecules as chemical changes result in new substances with different chemical compositions.

Answer:

conduct a test to determine the chemical makeup of the molecules