Title
Further Investigations: Phases of Matter
Table of Contents
- The melting point is considered a more characteristic feature of a substance than freezing point because liquids can be supercooled. Research supercooling and when and where it occurs.
- Why is the boiling point of glucose unknown?
- Research how dry ice is used. Purchase some dry ice and watch it sublimate. Because dry ice is much cooler than water ice, protect your hands with gloves!
- Experiment with the effects of pressure on ice.
- Rest the ends of a large block of ice (e.g. a frozen milk carton sized block) between two equally high objects (see Fig. 5-9).
- The ice should be at least 20cm from the ground.
- If the ground should not get wet, lay a towel under the block.
- Tie a weight to the end of a piece of string. Tie the string around the middle of the block of ice so the weight hangs below.
- The weight should be heavy enough to exert a good deal of pressure on the ice block, but not break it.
- What do you think will happen to the ice in contact with the string? Why? Observe your experiment. Describe the behavior of the string and ice.
- Experiment with different weights and different sized ice blocks.
- Rest the ends of a large block of ice (e.g. a frozen milk carton sized block) between two equally high objects (see Fig. 5-9).
Fig. 5-9. Effects of pressure on ice, suggested set-up.
