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. test for the release of heat.
2. observe a color change.
3. conduct a test to determine the chemical makeup of the molecules.
4. monitor for the release of a gas.
1 answer
All of the given options can be reliable ways to observe that a chemical change has occurred when two substances come in contact with one another, as they are common signs of a chemical reaction.
1 answer