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)

Question

Responses

conduct a test to determine the chemical makeup of the molecules

monitor for the release of a gas

test for the release of heat

observe a color change

Answer 1

All of the options provided are indicators that a chemical change may have occurred, but the most reliable way to observe that a chemical change has occurred is:

monitor for the release of a gas.

While the other options (conducting a test for chemical makeup, testing for heat release, and observing a color change) can also suggest a chemical change, the release of gas is a clear and often definitive sign that a new substance is being formed.