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Further Investigations: Phases of Matter

  1. 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.
  2. Why is the boiling point of glucose unknown?
  3. 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!
  4. Experiment with the effects of pressure on ice.
    1. 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).
      1. The ice should be at least 20cm from the ground.  
      2. If the ground should not get wet, lay a towel under the block.  
    2. 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.
      1. The weight should be heavy enough to exert a good deal of pressure on the ice block, but not break it.  
    3. 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.  
    4. Experiment with different weights and different sized ice blocks. 
Fig. 5-9.  Effects of pressure on ice, suggested set-up.

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Exploring Our Fluid Earth, a product of the Curriculum Research & Development Group (CRDG), College of Education. University of Hawaii, 2011. This document may be freely reproduced and distributed for non-profit educational purposes.