Sub Plan: Balancing Chemical Equations
Objective: Students will be able to balance chemical equations by applying the law of conservation of mass.
Materials: - Balancing Chemical Equations Notes (see below) - Balancing Chemical Equations Practice Worksheet (see below) - Video: “Balancing Chemical Equations Explained” (provide link or DVD)
Sub Plan Outline: 1. Introduction (5 minutes) - Write the objective on the board: “Today, we will learn how to balance chemical equations.” - Explain that balancing chemical equations is an essential skill in chemistry, as it helps us understand how different substances interact and react with each other. - Inform students that they will be watching a video and completing practice problems to reinforce their understanding.
- Video: “Balancing Chemical Equations Explained” (15 minutes)
- Provide students with the link to the video or play the DVD.
- Instruct students to watch the video attentively, taking notes on the key concepts and strategies for balancing chemical equations.
- Encourage students to pause the video if needed to fully understand the content.
- Balancing Chemical Equations Notes (15 minutes)
- Distribute the Balancing Chemical Equations Notes handout to each student.
- Instruct students to review their notes from the video and fill in any missing information or additional explanations.
- Walk around the classroom to answer any questions and provide assistance as needed.
- Practice Activity: Balancing Chemical Equations (20 minutes)
- Distribute the Balancing Chemical Equations Practice Worksheet to each student.
- Explain that they will be practicing balancing chemical equations independently.
- Instruct students to read each chemical equation carefully and balance it by adjusting the coefficients in front of each compound.
- Remind students to follow the law of conservation of mass, ensuring that the number of atoms on both sides of the equation is equal.
- Encourage students to refer to their notes and the strategies discussed in the video.
- Circulate the classroom to provide support and answer any questions.
- Wrap-up and Review (5 minutes)
- Collect the completed practice worksheets from students.
- Recap the main concepts of balancing chemical equations, emphasizing the importance of maintaining the law of conservation of mass.
- Address any common mistakes or misconceptions that arose during the practice activity.
- Remind students to review their notes and practice balancing chemical equations independently for further reinforcement.
Note: The Balancing Chemical Equations Notes and Practice Worksheet should be created separately based on the specific content and level of difficulty appropriate for 8th graders.
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