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Massachusetts Comprehensive Assessment System

2011, High School Intro Physics

  Question 45: Open-Response  
On a hot day, a student places a glass of cold lemonade on a table outdoors. After a few minutes, water droplets have formed on the outside of the glass.
  1. Is energy absorbed or released by the cold lemonade? Explain your answer.
  2. Compare average kinetic energy for the air molecules and lemonade molecules when the student first places the lemonade outdoors. Explain your answer.
  3. Explain how and why the water droplets form on the outside of the glass.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 Response demonstrates a thorough understanding of the relationship between average molecular kinetic energy and temperature; the relationships among evaporation, condensation, cooling, and warming; and that energy is absorbed when a substance changes from a solid to a liquid to a gas. The response identifies that heat is absorbed and explains why. The response correctly compares the average kinetic energy of the air molecules and lemonade molecules and explains this comparison. The response also thoroughly explains how and why the water droplets form on the outside of the glass.
4
3 Response demonstrates a general understanding of the relationship between average molecular kinetic energy and temperature; the relationships among evaporation, condensation, cooling, and warming; and that energy is absorbed when a substance changes from a solid to a liquid to a gas.
2 Response demonstrates a limited understanding of the relationship between average molecular kinetic energy and temperature; the relationships among evaporation, condensation, cooling, and warming; and that energy is absorbed when a substance changes from a solid to a liquid to a gas.
1 Response demonstrates a minimal understanding of the relationship between average molecular kinetic energy and temperature; the relationships among evaporation, condensation, cooling, and warming; and that energy is absorbed when a substance changes from a solid to a liquid to a gas.
0 Response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

High School Intro Physics

Question 12: Electromagnetism
Question 23: Motion and Forces
Question 32: Waves and Radiation
Question 44: Motion and Forces
Question 45: Heat and Heat Transfer

Return to the MCAS 2011 Student Work Directory



Last Updated: Jul 11, 2016
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