Physical changes alter the shape, size, or state of matter without producing new substances, such as breaking a pencil, freezing water, or melting ice. Chemical changes produce entirely new substances through molecular rearrangement, evidenced by traits like bubbles, color changes, smells, or temperature changes. An example of a chemical change is mixing glue with Borax solution to form a new substance called "goop."

1. Lesson 4Lesson 4
How does matter change?How does matter change?

2. 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)

3. phase changes-
caused by adding or removing energy

4. melting point
• temperature @ which substance
melts
• helps identify a substance

5. boiling point
• Temp. @ which substance
changes from liquid  gas

6. chemical change
• change that
produces a
different kind
of matter

7. evidence of a chemical change
1. bubbles
2. new color
3. different smell or temp.
4. heat produced

8. elements
• simplest pure substances
• more than 100 elements
• organized into Periodic Table

9. • position gives information about
properties of each element

10. Chemical change experiment
• Describe the appearance of
the glue.
• Describe the appearance of
the Borax solution.
• Describe the appearance of
the goop.

12. ice cube
melting

13. chemical change

14. chemical change
nail
rusting

15. water
boiling

16. cooking pizza
chemical change

17. chemical change
Tarnished
penny