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# Massachusetts Comprehensive Assessment System

## 2013, High School Chemistry

 Question 45: Open-Response Reporting Category: Solutions, Equilibrium, and Acid-Base TheoryStandard: 7.3 - Identify and explain the factors that affect the rate of dissolving (e.g., temperature, concentration, surface area, pressure, mixing). A student follows the procedure below to determine how two variables will affect the dissolution rate of sugar in water.Place a 2.0 g sugar cube into 150 mL of 10°C water.Place an identical 2.0 g sugar cube into 150 mL of 50°C water.Place 2.0 g of granulated sugar into 150 mL of 50°C water.Stir the three sugar-water mixtures equally.Measure the time it takes for all of the sugar in each mixture to dissolve.Identify the two variables being tested in the procedure.Describe the most likely effect each variable in part (a) has on the rate at which the sugar dissolves in water. Explain your reasoning.Write a procedure to test the effect solvent volume has on the rate at which sugar dissolves in water.Describe the expected results for the procedure you wrote in part (c). Explain your reasoning.

### 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 factors that affect rate of dissolving, such as temperature, concentration, and surface area. The response correctly identifies the two variables being tested in the procedure and clearly describes and explains the most likely effect of each variable on the rate at which the sugar dissolves in water. The response also provides a valid procedure to test the effect of solvent volume on dissolution rate and clearly describes and explains the expected results for the procedure.
4
3
The response demonstrates a general understanding of factors that affect rate of dissolving, such as temperature, concentration, and surface area.
2
The response demonstrates a limited understanding of factors that affect rate of dissolving, such as temperature, concentration, and surface area.
1
The response demonstrates a minimal understanding of factors that affect rate of dissolving, such as temperature, concentration, and surface area.
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.

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