Begin with a captivating demonstration: Show a piece of paper being folded and unfolded, and a chocolate bar being broken and then melted. Discuss how these actions represent physical changes in matter.
Go to the LessonLesson Plans
Changes in Matter – Physical Changes
Learning Objectives
- Understand the concept of physical changes in matter and how they differ from chemical changes.
- Identify examples of physical changes, such as folding paper or breaking chocolate, and recognize that no new matter is created.
- Explain how physical changes, including changes in state, can be reversible, using the example of melting and solidifying chocolate.
- Describe how the amount of matter remains constant during physical changes, even when its shape or state changes.
Introduction and Hook
Direct Instruction
Explain the concept of physical changes in matter, emphasizing that these changes do not create new substances and are often reversible.
Use the video 'Is Folding Paper a Physical or Chemical Change' to illustrate how physical changes alter the shape or state of matter without producing new matter.
Guided Exploration
Facilitate a discussion on reversible physical changes using examples like melting and solidifying chocolate. Highlight the concept that the amount of matter remains constant.
Watch the video 'Reversible and Irreversible Changes to Matter' to explore the differences between reversible physical changes and irreversible chemical changes.
Hands-On Activity
Engage students in a hands-on activity where they fold paper and break chocolate, observing the changes and discussing why these are physical changes.
Use the 'Physical Changes to Matter– Comprehension' worksheet to reinforce the concept of physical changes through fill-in-the-blank questions and diagram drawing.
Independent Practice
Assign students to find examples of physical changes at home, such as melting ice or folding clothes, and describe why these are physical changes.
Check for Understanding
Conduct a quick quiz using the video 'Chemical and Physical Changes – Quiz Edition' to test students' ability to distinguish between physical and chemical changes.
Review and Reflection
Have students reflect on the lesson by writing a short paragraph about a physical change they observed and why it fits the criteria of a physical change.
Assessment and Extension
Use the 'Physical or Chemical Change?' assessment to evaluate students' understanding of the differences between physical and chemical changes.
Try the Quiz
For extension, students can explore the 'States of Matter – Comprehension' worksheet to deepen their understanding of matter properties and transformations.
