1. Chemical vs. Physical Reactions
7th Grade Science

2. What are some ways that you can change a piece of paper
What are some ways that you can change a piece of paper? Write down one way on a sheet of paper

3. Share your idea with your table
Share your idea with your table. Is that a chemical or physical change to the paper? Why or why not?

4. Explore Listen for the teacher’s instructions.
As you rotate through the stations write down:
Is this a chemical or physical change?
How do you know?

5. Indicators of Chemical Change:
Change in temperature
Change in color
Noticeable odor (during the reaction)
Formation of a precipitate
Formation of bubbles

6. Talk with your group about your original ideas about the five reactions? Were you correct? Were you not correct? Why?

7. Molding clay Making slime
Here are some things that you originally wrote down as chemical or physical changes. Choose five of them.
Molding clay Making slime
Something rusting Mixing baking soda and vinegar
Cake batter turning into a cake Melting ice
Kicking a soccer ball Bleaching a shirt
Spinning a fidget spinner Copper corroding
Are they chemical or physical changes?
Were you correct?
How do you know whether they are chemical or physical changes (use the indicators)?

8. Create a visual representation of your indicator
You must:
Include at least three different colors
Be between three and six inches tall
Be neatly done and easy to distinguish
Fully represent the indicator
Use all of your group members