Unit 5 Lesson 1 What Are Physical and Chemical Changes? Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 5 Lesson 1 What Are Physical and Chemical Changes? Florida Benchmark SC.4.P.9.1 Identify some familiar changes in materials that result in other materials with different characteristics, such as decaying animal or plant matter, burning, rusting, and cooking. Copyright © Houghton Mifflin Harcourt Publishing Company

Physical Changes Are All Around Unit 5 Lesson 1 What Are Physical and Chemical Changes? Physical Changes Are All Around A physical change is a change in which a new substance is not formed. Changing size and shape are physical changes. Changing a physical property, such as size, shape, texture, or mass, is a physical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Chemical Changes Are All Around Unit 5 Lesson 1 What Are Physical and Chemical Changes? Chemical Changes Are All Around A chemical change occurs when one or more substances are changed into entirely new substances. Rusting metal and rotting leaves are examples of chemical changes. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 5 Lesson 1 What Are Physical and Chemical Changes? Chemical vs. Physical Cutting an orange is an example of a physical change. An orange decaying is an example of a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Chemical Changes at Home Unit 5 Lesson 1 What Are Physical and Chemical Changes? Chemical Changes at Home There are four signs that a chemical change has occurred. A release of gas or an odor can indicate a chemical change. A color change can indicate a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Chemical Changes at Home Unit 5 Lesson 1 What Are Physical and Chemical Changes? Chemical Changes at Home A change in temperature can indicate a chemical change. The formation of a new substance can indicate a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company 7

Unit 5 Lesson 1 What Are Physical and Chemical Changes? Making Pizza When you make pizza, several physical and chemical changes occur. Pushing and pulling the dough and cutting the vegetables are physical changes. The action of the yeast and the baking of the pizza are chemical changes. Copyright © Houghton Mifflin Harcourt Publishing Company