Unit 4 Lesson 2 How Does Matter Change? Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 2 How Does Matter Change? Florida Benchmark SC.5.P.9.1 Investigate and describe that many physical and chemical changes are affected by temperature. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 2 How Does Matter Change? Classifying Change Physical changes are changes to matter that do not affect the type of matter. Slicing a pie is an example of a physical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 2 How Does Matter Change? Classifying Change Chemical changes result in a change in the identity of matter. A chemical reaction is the process in which new substances are formed during a chemical change. Baking a pie in an oven is an example of a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Swelling and Shrinking Unit 4 Lesson 2 How Does Matter Change? Swelling and Shrinking Most matter expands when temperature goes up and contracts when temperature goes down. Water expands when it freezes, making ice less dense than liquid water. Copyright © Houghton Mifflin Harcourt Publishing Company

Tampering with Temperature Unit 4 Lesson 2 How Does Matter Change? Tampering with Temperature Physical changes to matter can happen faster or slower at different temperatures. How quickly a change occurs is called the rate of change. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 2 How Does Matter Change? Faster or Slower? Increasing temperature can speed up the rate of a chemical change. Decreasing temperature usually slows down a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 2 How Does Matter Change? Fevers A fever is an increase in body temperature above the normal body temperature. Low fevers help the body fight disease. High fevers can cause severe problems. Your brain can signal your body to increase the chemical changes that produce energy, raising your temperature. Copyright © Houghton Mifflin Harcourt Publishing Company