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# Massachusetts Comprehensive Assessment System

## 2011, High School Chemistry

 Question 44: Open-Response Reporting Category: Properties of Matter and ThermochemistryStandard: 6.3 - Using the kinetic molecular theory, describe and contrast the properties of gases, liquids, and solids. Explain, at the molecular level, the behavior of matter as it undergoes phase transitions. At sea level, water boils at 100°C. The boiling point of water varies with changes in air pressure, as shown in the diagram below.Based on the diagram, describe what happens to the boiling point of water as air pressure decreases.Use the kinetic molecular theory to describe the process of boiling.Use the kinetic molecular theory to explain why the boiling point of water is affected by pressure.

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

ScoreDescription
4 The response demonstrates a thorough understanding of the kinetic molecular theory and how it relates to the properties of gases, liquids, and solids and the behavior of matter as it undergoes phase transitions. The response correctly describes what happens to the boiling point of water as air pressure decreases. The response also correctly uses the kinetic molecular theory to describe the process of boiling and to explain why the boiling point of water is affected by pressure.
4
3
The response demonstrates a general understanding of the kinetic molecular theory and how it relates to the properties of gases, liquids, and solids and the behavior of matter as it undergoes phase transitions.
2
The response demonstrates a limited understanding of the kinetic molecular theory and how it relates to the properties of gases, liquids, and solids and the behavior of matter as it undergoes phase transitions.
1
The response demonstrates a minimal understanding of the kinetic molecular theory and how it relates to the properties of gases, liquids, and solids and the behavior of matter as it undergoes phase transitions.
0
Response is incorrect or contains some correct work that is irrelevant to the concept being measured.

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

Question 11:
Question 23:
Question 33:
Question 44:
Question 45: