How are ice and water the same and different?
1. Ask the question
Review key ideas related to condensation and evaporation. Listen for and highlight the following responses:
- Water isn't destroyed as it evaporates; it moves somewhere else.
- During evaporation, water particles too small to see break away from the surface of a drop or puddle or lake and move into the air, becoming a gas called water vapor.
- The reverse of evaporation also happens: particles of water vapor clump together to form water drops large enough to see. This is called condensation.
- Temperature plays a role in evaporation and condensation. Warmer temperature causes evaporation to happen faster. As water vapor cools, particles clump together to form drops of condensation.
The next set of investigations explores another set of transformations: liquid water into solid water (ice), and solid water to liquid water. Explain that transformations of water (water vapor to liquid water; liquid water to solid water; solid water to liquid water) are called "changes of state" or "phase changes."
Introduce today's investigation question:
How are ice and water the same and different?
Students will continue to discover similarities and differences during the next two investigations.
Note: If you need to review the concept of material properties, here are some examples:
- Glass is transparent, hard, smooth, and brittle.
- Wood is opaque, and will not conduct electricity.
- Oil is sticky and flows slowly (viscous).
Material properties are independent of the size of the sample.
