Mole Conversions in a Heterogeneous Class
Ms. Rivera teaches a heterogeneous 10th-grade chemistry class of 30. The lesson is mole-to-mass conversions using the periodic table. Four students have IEPs, including Devon, who has dyscalculia and an accommodation for a calculator and reduced item load; three are English learners, including Maya, a newcomer who reads English at about a third-grade level but is strong in mathematics; two are identified gifted, including Priya, who finishes early and then disengages. The district requires all students to work on grade-level chemistry standards, and the summative assessment must include stoichiometry word problems. The period is 48 minutes, and the class has access to Chromebooks and a co-teacher twice a week.
1. Design a scaffolded lesson sequence for Maya and Devon that preserves grade-level chemistry content.
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The sequence should keep the same conceptual target, mole-to-mass conversion, while changing the access route. Begin with a concrete anchoring example: 1 dozen eggs and 1 mole as counting units, with a visual of Avogadro's number as a count, not a mass. Give Maya a bilingual glossary with the key terms 'mole,' 'molar mass,' 'mass,' and 'convert,' plus a labeled worked example with the English sentence frames 'One mole of ___ has a mass of ___ g.' Her strong mathematics can be leveraged by letting her solve the numerical part first and then attach the English explanation.
For Devon, reduce the number of practice items but not the type of reasoning. Provide a calculator, a color-coded template that separates given, conversion factor, and answer, and a partially worked example. Use a consistent three-step routine: find molar mass from the periodic table, set up the conversion so units cancel, calculate. Both students should still interpret a word problem and explain the answer's meaning, because that is the grade-level standard. The co-teacher can check the first item at each station while Ms. Rivera models the second.
2. How should Ms. Rivera assess all students against the same standards while using appropriate accommodations?
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She should hold the standard constant: students must set up and solve a mole-to-mass problem and explain what the answer means. Accommodations change access, not the target. For Devon, a calculator and reduced item load are allowed, but the remaining items must include the same cognitive demand, including one word problem and one explanation. For Maya, a bilingual glossary and sentence frames are appropriate; the assessment should still require her to choose the correct conversion and interpret the result, not just match vocabulary.
A defensible assessment might have a common core of two items for everyone plus an extension. The common core should include a straightforward calculation and a contextual problem such as finding the mass of 0.25 mol of calcium carbonate. Students can show work in a template, and the rubric should award points for correct molar mass, unit cancellation, calculation, and explanation. Ms. Rivera should avoid replacing the word problems with isolated arithmetic, because that would lower the standard rather than accommodate the disability or language need.
3. What should Priya and other early finishers do that supports the same standard rather than becoming busywork?
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Priya's extension should deepen the same mole concept. For example, she can compare the mass of one mole of water with one mole of glucose, then explain why equal numbers of particles do not mean equal masses, and design a one-question check for peers that tests unit cancellation. Alternatively, she can analyze an incorrect student solution and write a correction with reasoning. This keeps her on grade-level content while adding depth, not just more items.
If she serves as a peer explainer, give her a specific role such as asking 'Which unit should cancel?' rather than simply giving answers. Ms. Rivera should check the extension briefly and include it in the assessment picture, so Priya sees it as legitimate work. The goal is to avoid the pattern in which gifted students finish early and disengage while others receive scaffolds; the same big idea should stretch in multiple directions.