Free 10th Grade Limiting And Excess Reactant Lesson Plan (Science)

Topic: Limiting and Excess Reactant

Objectives & Outcomes

• Students will be able to define limiting and excess reactant and explain their roles in a chemical reaction.

Materials

• A chemolithotrophic bacteria lab demo kit or a simple demo kit consisting of two reactant beakers, one solution beaker, and a stirring rod
• Handouts with definitions and descriptions of limiting and excess reactant
• Pencils and paper for notes and practice problems

Warm-up

• Ask students to recall what they know about chemical reactions and the role of reactants.
• Write their responses on the board and discuss as a class.
• Ask students if they have ever witnessed a chemical reaction in real life or in a lab setting.
• Write their responses on the board and discuss as a class.

Method

• Begin the lesson by explaining that in a chemical reaction, the reactants are the substances that are changed into new substances.
• Ask students to think of a time when they saw a chemical reaction in real life or in a lab setting.
• Have them describe the changes they saw and their observations about the reactants and products.
• Write their responses on the board and discuss as a class.
• Next, introduce the topic of limiting and excess reactant and explain that they play an important role in chemical reactions.
• Ask students to think of a time when they witnessed a chemical reaction in real life or in a lab setting.
• Have them describe the changes they saw and their observations about the reactants and products.
• Write their responses on the board and discuss as a class.

Direct Instruction

• Review the characteristics of limiting and excess reactant using the handouts.
• Explain that a limiting reagent is a reactant that is limited in quantity and that it limits the amount of product that can be produced.
• Explain that an excess reagent is a reactant that is in excess in quantity and that it can produce more product than needed.
• Use the examples in the handouts to illustrate the characteristics of limiting and excess reactant.
• Ask students to raise their hand if they have any questions about the concepts discussed.

Guided Practice

• Divide students into pairs or small groups.
• Give each group a set of reactants and ask them to identify the limiting and excess reactants.
• Have students explain their reasoning and have a group member present their reasoning to the class.
• Repeat with additional sets of reactants.

Independent Practice

• Give students a worksheet with a table of reactants and a set of instructions.
• Have students fill in the limiting and excess reactant for each set of reactants.
• Have students explain their reasoning and have a group member present their reasoning to the class.

Closure

• Review the concept of limiting and excess reactant and the characteristics of each.
• Ask students to give an example of limiting and excess reactant in a given situation.
• Remind students that knowing the amount of reactants available can help them to determine the potential for a reaction to occur.

Assessment

• Observe students during the guided practice and independent practice activities to assess their understanding of limiting and excess reactant.
• Collect and review the worksheets and independent practice activity to assess students' ability to apply their understanding of limiting and excess reactant in a given situation.
• Administer a quiz at a later date to assess students' retention of the concept of limiting and excess reactant.