Activity 1 - Solid vs. Liquid:
- fill clear bowl/cup/glass about 3/4 full of water
- have student drop 1-3 ice cubes into water
- investigate...
- What happens to the ice cubes?
- How would you describe what the ice cubes are doing?
- Do they sink or float?
- Which is a solid/liquid, the water or ice?
- What happens when you try to push the ice cubes to the bottom?
- What would happen if we left the ice cubes (solid) in the container for a long time?
- What would happen if we put this container in the freezer?
- investigate further... (Add other objects to bowl/cup/glass and see what happens. ex. rock, small twig, leaf)
- sort all items (physically or verbally) into categories based on "solid"/"liquid", "float"/"sink", etc.
- Note... Water is an exception due to the fact it becomes less dense when it turns to a solid.
Activity 2 - Solid to Liquid to Gas:
- Either start with just ice cubes, or ice cubes in water, and put into a pot on the stove top.
- With adult assistance for younger students, turn the stove top on and observe what happens as the contents of the pot heat up. (Bring to boil to show water turning into steam, "gas".)
- investigate...
- What changes do you see happening?
- When did you start to see steam (water vapor, gas)?
- How would you describe the movement of the water (liquid) as it heated up?
- How would you describe the movement of the steam (gas) as it moved out of the pot?
- What would happen if we shut the stove top off and let the liquid cool?
- What would happen if we put the pot of liquid in the freezer?
Web Resources:
- BrainPOP Jr., "Sink or Float" http://www.brainpopjr.com/science/forces/sinkorfloat/draganddrop/
- BrainPOP Jr. "Liquid to Solid Sequence Game" http://www.brainpopjr.com/science/matter/changingstatesofmatter/sequenceorder/
- BrainPOP Jr. "Solid, Liquid, Gas Matching Game" http://www.brainpopjr.com/science/matter/solidsliquidsandgases/matching/
- Solid, Liquid, Gas Particles (Note: water is an exception with a solid state that expands...) http://www.harcourtschool.com/activity/states_of_matter/
- Solid, Liquid, Gas Sorting Game http://www.sciencekids.co.nz/gamesactivities/gases.html
- Scholastic Study Jams: Solids, Liquids, and Gases http://teacher.scholastic.com/activities/studyjams/matter_states/
Extensions:
- Molecule Models - Make H20 models using Styrofoam balls (two hydrogen atoms to every one oxygen atom). Demonstrate how the atoms would spread apart as they get colder, therefore becoming less dense than liquid version of the same molecules. The molecules take up more space in their frozen (solid) version.
- Activity idea... Fill two plastic water bottles with water. Put the lid on one, but not on the other. Place both in the freezer for 24 hours. Remove and note differences of the two bottles.
- Big Idea: When water changes from a liquid to a solid, it expands, therefore becoming less dense than its liquid form.
- Cold vs. Warm Water - Fill two separate containers, one with warm/hot water and the other with cold. Using a dropper or small container, pour a small amount of colored cool water into each container. Observe/discuss what happens. Try this activity again with two containers of cold water and two different temperature colored water.
(The blue "cold" current sinks to the bottom, then gradually mixes into the body of water.)
- Big Idea: Cold water currents move slower than warm water currents.
- Further Big Idea: Pond/Lake turnover* doesn't happen quickly.