Differentiation Modifications Have students select which fuel they would like to complete in step 4. The checklist on the back of the Three Questions Handout can be used to scaffold students’ explanations in many ways. Students refer to the checklist as they are constructing their explanations. Students use the checklist as they are sharing and revising their explanations with a partner. Students use the checklist to critique and revise their final explanations. Students use the checklist to create and/or evaluate a whole-class consensus explanation. We recommend using this checklist with a gradual release. As students improve in their ability to write their own explanations, they may rely on the checklist less. Tips Emphasize the similarities among the explanations of all organic materials burning. There are different fuel molecules, but the same kinds of atoms, bonds, reactions, and forms of energy. The same rules and patterns apply to all examples of burning organic materials. Extending the Learning Have students read the articles and/or watch the videos listed in the Digging Deeper section of the 5.4 Other Organic Materials Readings. Have students construct a model that shows the combustion of other materials with the molecular models and use those models to write balanced chemical equations. Have students explain combustion of other organic materials that they choose. They can find structural formulas for many organic materials on the Internet.