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# Massachusetts Comprehensive Assessment System

## 2013, High School Chemistry

 Question 11: Open-Response Reporting Category: Bonding and ReactionsStandard: 5.4 - Determine percent compositions, empirical formulas, and molecular formulas. A page from a lab notebook is shown below. The page displays data needed to find the empirical formula of a compound.Calculate the values for x and y. Show your calculations and include units in your answer.Assume all the iron and sulfur reacted to form an iron-sulfur compound. Calculate the number of moles of sulfur and the number of moles of iron that reacted to form the compound. Show your calculations and include units in your answer.Determine the empirical formula for the iron-sulfur compound. Show your calculations or 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 how to determine empirical formulas. The response correctly completes the data table, calculates the number of moles of each reactant, and determines the empirical formula of the product.
4
3
The response demonstrates a general understanding of how to determine empirical formulas.
2
The response demonstrates a limited understanding of how to determine empirical formulas.
1
The response demonstrates a minimal understanding of how to determine empirical formulas.
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: