Introduction to Matter (Book)

Signs of Chemical Change

How can you tell whether a chemical change has occurred? Often, there are clues. Several are demonstrated in the video below.

To decide whether a chemical change has occurred, look for these signs:

• Gas bubbles are released. (Example: Baking soda and vinegar mix and produce bubbles.)
• Something changes color. (Example: Leaves turn from green to other colors.)
• An odor is produced. (Example: Logs burn and smell smoky.)
• A solid comes out of a solution. (Example: Eggs cook and a white solid comes out of the clear liquid part of the egg.)