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Lesson 4Lesson 4
How does matter How does matter change?change?
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physical change • change in the size, shape, or state of
matter • NO new matter formed• examples:
1. breaking a pencil
2. phase changes (freezing, melting)
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phase changes-caused by adding or removing energy
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melting point• temperature @ which substance
melts
• helps identify a substance
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boiling point
• Temp. @ which substance changes from liquid gas
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chemical change
• change that produces a different kind of matter
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evidence of a chemical change
1. bubbles
2. new color
3. different smell or temp.
4. heat produced
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elements
• simplest pure substances
• more than 100 elements
• organized into Periodic Table
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• position gives information about properties of each element
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Chemical change experiment
• Describe the appearance of the glue.
• Describe the appearance of the Borax solution.
• Describe the appearance of the goop.
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ice cube melting
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chemical change
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chemical change
nail rusting
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water boiling
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cooking pizza
chemical change
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chemical change
Tarnished penny