This document discusses physical and chemical changes. It defines physical changes as changes that affect physical properties but do not form new substances, while chemical changes form new substances with different properties and identities. Examples of physical changes given include state changes like melting and dissolving, while chemical changes include cooking, burning, and rusting. Signs that a chemical change is occurring include changes in color, odor, production of heat, fizzing or bubbling, sound, and light. The document asks readers to identify examples as physical or chemical changes.

1. Physical & Chemical
Changes
•Is melted butter still butter?
•Is soured milk still milk?
•Are the ashes from a fire made of the same
“stuff” as wood?
7th Grade
Brandy Butcher

2. What is a physical change?
 Change that affects one or more
physical properties of a substance
 A new substance is not formed
 The substance keeps its identity
(name)

3. Examples of Physical Change
 Any state change
◦ Melting
◦ Freezing
◦ Evaporating
 Dissolving
 Cutting
 Bending

4. Examples of Physical Changes
in Nature
 Water Cycle
 Erosion

5. Can you think of any examples?

6. What is a chemical change?
 One or more substances are changed
into a new substance
 New and different properties
 New identity (name)

7. Examples of a Chemical Change
 Cooking
 Burning
 Rusting

8. Examples of Chemical Changes
in Nature
 Carbon Cycle
 Nitrogen Cycle
 Chemical Weathering

9. Can you think of any examples?

10. What are the signs a chemical
change is happening?
 Change in color
 Change in odor
 Production of heat
 Production of fizzing, foam, bubbles
 Production of sound
 Production of light

11. What signs do this changes
demonstrate?
Change in odor and
color
Change in odor and
color
Change in color

12. Physical or Chemical Change?
 Frying an egg?
 Physical or Chemical

13. Incorrect. Try again!

14. Correct!
Try the next one!

15. Physical or Chemical Change?
 Souring Milk?
 Physical or Chemical

16. Incorrect. Try again!

17. Correct!
Try the next one!

18. Physical or Chemical Change?
 Shredding paper?
 Physical or Chemical

19. Incorrect. Try again!

20. Correct!

21. Credits
 All pictures used were free and
retrieved from www.morguefile.com.