Physical and Chemical Change
chemical change, physical change, gas change, color change
A chemical change is a change that happens in a chemical way.During a chemical change the substance changes temperature.Another sign is the formation of gases or precipitation.Also it might change color.A example is burning wood or mixing vinegar and baking soda.When a chemical change occurs it makes a new substance.
The formation of a gas is the third sign that a reaction may have occurred. The formation of bubbles when two liquids are mixed usually indicates that a gas has formed.
A gas can also be formed when a solid is added to a solution.