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)
observe a color change
monitor for the release of a gas
test for the release of heat
conduct a test to determine the chemical makeup of the molecules
1 answer
All of the options listed can be reliable ways to observe that a chemical change has occurred when two substances come in contact with each other. However, the most immediate and easily observed changes would be a color change or the release of a gas.