Lesson 5.1.5 - Changes in Matter

In Lesson 5, we will investigate the types of changes that can happen to matter. Although the Law of Conservation of Matter and Energy teaches us that new matter is not being created in our universe, the matter that makes it up is constantly undergoing changes. These changes in matter can be classified as either physical or chemical changes. Physical changes are changes that happen without a chemical action. These changes do not change the chemical composition of a substance and are often easily reversible. Chemical changes, on the other hand, happen as a result of a chemical reaction. These changes occur on the molecular level and result in the formation of a new substance. During this lesson students will also have the opportunity to demonstrate their own examples of physical and chemical changes in matter.