Lesson 4Lesson 4

How does matter How does matter change?change?

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)

phase changes-caused by adding or removing energy

melting point• temperature @ which substance

melts

• helps identify a substance

boiling point

• Temp. @ which substance changes from liquid gas

chemical change

• change that produces a different kind of matter

evidence of a chemical change

1. bubbles

2. new color

3. different smell or temp.

4. heat produced

elements

• simplest pure substances

• more than 100 elements

• organized into Periodic Table

• position gives information about properties of each element

Chemical change experiment

• Describe the appearance of the glue.

• Describe the appearance of the Borax solution.

• Describe the appearance of the goop.

ice cube melting

chemical change

chemical change

nail rusting

water boiling

cooking pizza

chemical change

chemical change

Tarnished penny