In this lesson, students will conduct several investigations to help them to understand the differences between chemical and physical changes. Students will record investigative observations and use their observations to provide evidence that a physical or a chemical change has occurred.
Four 50-minute class periods
1.3, 2.5, 3.1, 3.3, 3.4, 3.7, 5.2, 5.4, 7.2, 7.3
|Lesson Components||Time||Inquiry Skills||Tech. Used||Engage Level||Brief Description|
|Engage||20 min||1.3, 5.2||lab equipment||2||The teacher will conduct the elephant's toothpaste demonstration. Students will use prior knowledge to defend their claim that the demonstration was a physical or a chemical change.|
|Explore||90 min||1.3, 2.5, 3.1, 3.3, 3.4, 3.7||timer and lab equipment||3||Students will work in groups of 2 to 4 to explore how substances react with other substances to produce chemical changes, and how other substances do not react but their physical properties may change.|
|Explain||45 min||5.2, 5.4, 7.2||none||2||Students will share answers on the previous activities. They will discuss whether physical and chemical changes took place.|
|Expand||50 min||1.3, 2.5, 3.1, 3.3, 3.4, 3.7, 5.2, 5.4, 7.2||none||3||Students will work in teams of 3 or 4 to identify unknown substances based on their reactivity|
|Evaluate||45 min||7.3||none||2||Students will review their learning using the Inside-outside circle technique. The teacher will monitor and evaluate the student discourse. The teacher can also use a 6 questions summative assessment.|
|1||Low||Listen to lecture, observe the teacher, individual reading, teacher demonstration, teacher-centered instruction|
|2||Medium||Raise questions, lecture with discussion, record data, make predictions, technology interaction with assistance|
|3||High||Hands-on activity or inquiry; critique others, draw conclusions, make connections, problem-solve, student-centered|
Please share your comments (e.g., strengths, areas for improvement, your implementation results if you taught the lesson in your class, and any modifications you made). Thanks!