1. Glow Stick Lab

2. PRE-LAB
Law of conservation of mass: matter is not created or destroyed in any chemical or physical change; also called law of conservation of matter
Mass is not lost or gained
No new atoms are created, no atoms are destroyed

3. HOW DOES TEMPERATURE AFFECT HOW BRIGHT A GLOW STICK WILL GLOW?
QUESTION
HOW DOES TEMPERATURE AFFECT HOW BRIGHT A GLOW STICK WILL GLOW?

4. HYPOTHESIS
IF A GLOW STICK IS PLACED IN COLD WATER, THEN BRIGHTNESS OF THE GLOW STICK WILL BE (MORE/LESS) _________ BRIGHT THAN IF THE GLOW STICK WERE PLACED IN WARM WATER.

5. VARIABLES
INDEPENDENT VARIABLE _______________________________ DEPENDENT VARIABLE _______________________________

6. SUPPLIES DIGITAL SCALE 2 GLOW STICKS CUP OF COLD WATER
CUP OF WARM WATER

7. PROCEDURE Take mass of uncracked glow stick.
Then crack entire glow stick. Take its mass again after it’s cracked.

8. PROCEDURE
Crack other glow stick. Submerge one into cold water and the other into warm water.
Compare the 2 & record observations.

9. DATA TABLE
Mass of glow stick (g)
Before
After

10. DATA TABLE
Water
Observations of glow stick (I see…)
Cold
Warm

11. POST-LAB
Was your hypothesis supported by the data you got from doing the experiment? In other words, did what you predict would happen actually happen? (You don’t have to copy this, just answer the question in a complete sentence)