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Michal Kreiselman

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Phase Changes

Explore the relationship between molecular motion, temperature, and phase changes. Compare the molecular structure of solids, liquids, and gases. Graph temperature changes as ice is melted and water is boiled. Find the effect of altitude on phase changes. The starting temperature, ice volume, altitude, and rate of heating or cooling can be adjusted.

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Assessment Questions (5):

The graph represents the heating of water in a pot. At 150 seconds, the water has just reached a boil. If the heat is left on, what will happen to the temperature and volume of water in the pot? (All temperatures in °C.)
- A. The temperature will rise, and the water volume will decrease.
- B. The temperature will rise, and the water volume will remain constant.
- C. The temperature will remain constant, and the water volume will decrease.
- D. The temperature will remain constant, and the water volume will remain constant.
Which of the following statements is most accurate?
- A. When liquid water is heated, the molecules move faster.
- B. When liquid water is heated, the molecules collide more often.
- C. When liquid water is heated, collisions between molecules are more violent.
- D. All of the above.
In a pressure cooker, a lid is screwed tightly onto a pot so that the air pressure in the pot is increased. What effect, if any, will this have on the boiling point of water in the pot?
- A. The boiling point will be raised.
- B. The boiling point will be lowered.
- C. The boiling point will be unaffected.
- D. None of the above.
Which of the following descriptions explains the process of water freezing?
- A. Water molecules speed up until they escape into a different phase.
- B. Water molecules slow down until they begin to bond together.
- C. Water molecules are squeezed together by high pressure until they begin to stick to one another.
- D. As water molecules cool, their shape changes from rounded to irregular, making them more likely to link to one another.
Which of the graphs below illustrates water boiling in Denver, Colorado? (Altitude 1,600 meters.)
- A. Graph A
- B. Graph B
- C. Graph C
- D. Graph D

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