1. Test Item Analysis:Bonnie PrincipeHigh School Chemistry Stoichiometry

2. Navigation Page Item Analysis • Standardized Test Item • Test Item Type • Test Item Structure • Embedded Content and Skills • Standards Correlation • Content Clarification • Strand Map (Science) • Instructional Alignment • Next Generation Tools

3. Standardized Test Item Fe2O3 +3CO---->2Fe +3CO2 In the reaction above, how many grams of Fe2O3 are required to completely react with 84 grams of CO? A 64 g B 80. g C 160 g D 320 g Question taken from: California test, Feb. 2007 NavigationPage

4. Characterize the Test Item Enhanced Multiple Choice NavigationPage

5. Test Item Structure Stem: stoichiometry mass to mass problem Diagram: balanced chemical equation Distractors: all involve the mass of iron (III) oxide required in the reaction. Correct answer choice: C What makes this the correct choice? When the problem is set up correctly with the correct mole-mole ratio and correct conversion factors, C is the correct answer. NavigationPage

6. Identify Embedded Concepts & Process Skills Major Concepts and Big Ideas Dimensional analysis, relationship between mole and mass of a compound, information from periodic table, mole ratio, relationship between reactants and products in a chemical equation Major skill requirements Mathematical computation, interpreting chemical equations, calculating formula mass of compounds, setting up problem using factor label method Webb’s Knowledge Level Skill/concept NavigationPage

7. Connection to Standards TN Standard 3: Interactions of Matter Learning expectation: 3.3 explore the mathematics of chemical formulas and equations NSES ･ Atoms interact with one another by transferring or sharing electrons that are furthest from the nucleus. These outer electrons govern the chemical properties of the element. ･ An element is composed of a single type of atom. When elements are listed in order according to the number of protons (called the atomic number), repeating patterns of physical and chemical properties identify families of elements with similar properties. This "Periodic Table" is a consequence of the repeating pattern of outermost electrons and their permitted energies. ･ Bonds between atoms are created when electrons are paired up by being transferred or shared. A substance composed of a single kind of atom is called an element. The atoms may be bonded together into molecules or crystalline solids. A compound is formed when two or more kinds of atoms bind together chemically. ･ The physical properties of compounds reflect the nature of the interactions among its molecules. These interactions are determined by the structure of the molecule, including the constituent atoms and the distances and angles between them. NavigationPage

8. Content Clarification Bonnie’s Stoichiometry Content Clarification NavigationPage

9. Strand Map Strand Map Reference NavigationPage

10. Instructional Plan Inquiry Challenge: STOICHIOMETRY What Does It Take To…? NavigationPage