Changes to Matter.

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Presentation transcript:

Changes to Matter

Two ways to change matter Physical change: the substance ______________________, even if its form or state changes Eg: chopping wood, melting ice Chemical change: when one substance is ______________________ and has different properties Eg: burning wood, cooking eggs

How would you reverse the physical changes in the pictures? Are often (but not always) _________________ How would you reverse the physical changes in the pictures? Chopped wood Torn paper Dissolved sugar

How do we know it’s a physical change? Physical changes are changes to: It does NOT change it’s chemical composition “It still is what it was”

Chemical changes Are often _________________ (can’t reverse them), but not always Baking cookies Car engine

How do we know if it’s a chemical change? Chemical changes are when:

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Assignment Worksheet on physical and chemical changes