Lesson Plan: Reactivity 1.1

Subject: IB Chemistry Grade Level: 11th or 12th grade Duration: 90 minutes

Objectives: 1. Understand the concept of reactivity and its importance in chemical reactions. 2. Identify factors that affect reactivity, such as electronegativity, atomic size, and electron configuration. 3. Apply knowledge of reactivity to predict the outcome of chemical reactions. 4. Develop critical thinking and problem-solving skills through hands-on activities and group discussions.

Materials: 1. Periodic table 2. Whiteboard or blackboard 3. Markers or chalk 4. Safety goggles 5. Lab coats 6. Chemicals for demonstration and experiments (e.g., sodium, chlorine, magnesium, hydrochloric acid) 7. Test tubes and test tube racks 8. Bunsen burner or hot plate 9. Safety shower and eyewash station (as per lab safety requirements)

Procedure:

Introduction (10 minutes): 1. Begin the lesson by asking students what they understand by the term “reactivity” and why it is important in chemistry. 2. Write down their responses on the board and discuss the importance of reactivity in various chemical processes. 3. Introduce the topic of reactivity and explain that it refers to the tendency of a substance to undergo a chemical reaction.

Theory (30 minutes): 1. Present the factors that affect reactivity, such as electronegativity, atomic size, and electron configuration. 2. Use the periodic table to illustrate how electronegativity and atomic size change across periods and down groups. 3. Discuss how these factors influence the reactivity of elements and their ability to form compounds. 4. Provide examples of elements with high reactivity (e.g., alkali metals) and low reactivity (e.g., noble gases) to reinforce the concept. 5. Engage students in a class discussion on the relationship between reactivity and the position of elements in the periodic table.

Demonstration and Experiments (40 minutes): 1. Put on safety goggles and lab coats to ensure safety during the experiments. 2. Conduct a demonstration to show the reactivity of alkali metals (e.g., sodium) with water. Observe the vigorous reaction and discuss the products formed. 3. Divide students into small groups and provide them with a set of chemicals and equipment for experiments. 4. Instruct each group to perform a series of experiments to compare the reactivity of different elements (e.g., magnesium, chlorine) with various reagents (e.g., hydrochloric acid). 5. Guide students in recording their observations and discussing the results. 6. Facilitate a class discussion to analyze the experimental data and draw conclusions about the reactivity of different elements.

Conclusion and Application (10 minutes): 1. Summarize the key points discussed during the lesson, emphasizing the factors that affect reactivity and their significance in chemical reactions. 2. Assign a homework task that requires students to predict the outcome of specific chemical reactions based on their understanding of reactivity. 3. Encourage students to explore real-life applications of reactivity, such as the use of reactive metals in batteries or the reactivity of pollutants in the environment.

Assessment: 1. Monitor students’ participation and engagement during class discussions and experiments. 2. Evaluate students’ understanding of reactivity through their responses to homework questions or quizzes. 3. Assess students’ ability to apply the concept of reactivity to predict the outcome of chemical reactions.

Note: Ensure that all safety precautions are followed during the experiments, and provide proper guidance to students to prevent accidents or mishaps.