Test Item Analysis: Gas Laws Mr' Luttrell, Ms' Willis

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Test Item Analysis Gas LawsMr. Luttrell, Ms.
Willis Mr. SelvidgeCovington Munford High
SchoolTipton County, TN

• Grade Level High School
• Content Area Chemistry Algebra
• Source 2008 California Chemistry Practice
• Test, page 17 and 2007 Tennessee
• Math Item Sampler, page 10

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Step II Standards Alignment Connections to
Curriculum Framework Content Clarification Strand
Map

• Step I Item Analysis
• Standardized Test Item
• Test Item Type
• Test Item Structure
• Embedded Content and Skills

Step III Instructional Alignment Lesson Plan
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Step I Standardized Test Item One

• A sample of carbon dioxide gas occupies a
• volume of 20 L at standard temperature and
• pressure (STP). What will be the volume of a
• sample of argon gas that has the same number
• of moles and pressure but twice the absolute
• temperature?
• A. 10 L
• B. 20 L
• C. 40 L
• D. 80 L

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Step I Test Item Type and Structure

• Multiple Choice
• Stem A sample of carbon dioxide gas occupies a
  volume of 20 L at standard temperature and
  pressure (STP). What will be the volume of a
  sample of argon gas that has the same number of
  moles and pressure but twice the absolute
  temperature?
• Distractors A. 10 L, B. 20 L, and D. 80 L
• Correct answer choice C. 40 L
• What makes this the correct choice?
• At constant pressure, the volume of a given mass
  of an ideal gas increases or decreases by the
  same factor as its temperature on the absolute
  temperature scale
• V1 V2
• T1 T2

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Step I Standardized Test Item Two

• The volume of 400 mL of chlorine gas at
• 400 mm Hg is decreased to 200 mL at
• constant temperature. What is the new gas
  pressure?
• A. 400 mm Hg
• B. 300 mm Hg
• C. 800 mm Hg
• D. 650 mm Hg

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Step I Test Item Type and Structure

• Multiple Choice
• Stem The volume of 400 mL of chlorine gas at 400
  mm Hg is decreased to 200 mL at constant
  temperature. What is the new gas pressure?
• Distractors A, B, D
• Correct answer choice C
• What makes this the correct choice?
• At constant temperature, the volume of a given
  mass of an ideal gas increases or decreases by
  the inverse factor as its pressure changes.

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Step I Standardized Test Item Three
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Step I Test Item Type and Structure

• Multiple Choice
• Stem When Aaron walks, he burns 15 calories in 3
  minutes. He wants to calculate how many calories
  he will burn if he walks at the same rate for 45
  minutes. Which of these proportions should Aaron
  use to calculate how many calories he will burn
  in 45 minutes?
• Distractors A, B, C
• Correct answer choice D
• What makes this the correct choice?
• If you start with the calories in the numerator,
  they must remain there on the other side. The
  time remain in the denominator.

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Step I Embedded Concepts Process Skills

• Concepts and Big Ideas
• Gas Laws, Standard Temperature and Pressure,
  Proportions
• Process (Inquiry or problem solving) Skills
• Science reasoning, establishing the formulas,
  solving proportions, interpreting data
• What is the DOK Level for this test item?
• Strategic Thinking

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Step II Connections to State Curriculum
Framework

• CLE 3221.2.4  Investigate characteristics
  associated with the gaseous state.
• CLE 3102.1.5  Recognize and use mathematical
  ideas and processes that arise in different
  settings, with an emphasis on formulating a
  problem in mathematical terms, interpreting the
  solutions, mathematical ideas, and communication
  of solution strategies.

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Step II Content Clarification

• Science Content Clarification
• Math Content Clarification

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Step II Atlas of Science Literacy

• NSDL science investigations

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Step III Instructional Alignment

• Gas Laws/Proportions

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