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

Unit 4 Lesson 2 How Does Matter Change?

Copyright © Houghton Mifflin Harcourt Publishing Company


Florida Benchmark


• SC.5.P.9.1 Investigate and describe that many physical and chemical changes are affected by temperature.


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.


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.


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.


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.


Faster or Slower?


• Increasing temperature can speed up the rate of a chemical change.

• Decreasing temperature usually slows down a chemical 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.

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

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