Download Activity diffusion

Movement of Substances
DIFFUSION
Activity #1
1. Place one drop of food coloring into a beaker of water.
2. Observe what happens for 2-3 minutes.
Activity #2
1. Fill a cup with water. Gently touch the surface of the cup of water.
Taste the water.
2. Drop a sugar cube in the water.
3. Taste the water every 15 seconds.
MOVEMENT ACROSS THE MEMBRANE
Activity #3
1. Obtain a soaked raisin and an unsoaked raisin. Carefully blot the raisins dry.
Do not break the skins.
2. Use a toothpick to poke a hole in one end of each raisin.
3. Gently squeeze both raisins.
Performance Assessment:
1.
2.
3.
4.
5.
6.
Describe what happened to the drop of food coloring
How do molecules move?
What is diffusion?
What happened to the taste of the water?
What caused the taste of the water to change?
Explain how gases are exchanged between the respiratory system and the
circulatory system.
7. How do gases pass out of the lungs into the capillaries?
8. How do the soaked and unsoaked raisins differ?
9. What do you think is coming out of the raisin, how did this liquid get
into the raisin?
10. What does the skin of the raisin represent?
11. How is the tubing like a membrane? 19. How does digested food pass out of the
intestine into the capillaries?
12. How do materials enter and leave the cells?