Southern Leyte State University – Main CampusSogod, Southern Leyte

JACKYLOU SALUDES MAT – NatSci

LESSON PLAN IN CHEMISTRY

I. Objectives

At the end of the lesson, the students are expected to:a. explain the effect of changes in volume and temperature;b. use the volume-temperature relationship to determine the new volume or

temperature of a given amount of gas at a constant pressure; andc. give practical applications of Charles’s law.

II. Subject Matter

Topic: Charles’s LawMaterials: PowerPoint presentation, Video clips related to Charles’s lawReferences: Fundamentals of Chemistry, 5th Edition by Goldberg, D. ; Conceptual and

Functional Chemistry – Modular Approach, 2nd Edition by Padolina, M., et.al and Exploring Life through Science, Chemistry Laboratory Manual by Bayquen, A.

III. Procedure:

A. Motivation

Recall the concept of Boyle’s law by letting the students watch the video on the marshmallow-syringe activity. Ask them how Boyle’s law is being applied in the activity.

B. Lesson Development

1. Let the students watch a video clip which shows how to make the egg go into the bottle. Ask students about their observations from the video shown. Tell them that the air expands when heated and pushes its way out of the bottle because it has greater pressure than the air outside the bottle. And as the air inside the bottle cools, it contracts making the pressure inside the bottle less than outside that pushed the egg inside.2. Let the students perform a simple activity on Floating Candles. Ask on their observations and have representatives from each group explain their observations.3. Let the students watch the video clip which explains the concept of Charles’s law.4. Ask a student to state the Charles’s law and be able to give its mathematical equation. Using the mathematical equation, let the students observe and analyze the process of finding the change in volume or temperature of the gas. Present sample problems to the students. 5. Let the students solve sample exercises about the topic provided by the teacher.6. Ask the students to give practical applications of the law.

C. Application

Present this question to the students: To make 300 mL of oxygen at 20.0 oC change its volume to 250 mL, what must be done to the sample if its pressure and mass are to be held constant? (The sample should be cooled to -29.0 oC.)

IV. Evaluation

Quiz on the topic as shown on the PowerPoint slides.

V. Assignment

Research on the applications of Charles’s law in other fields such as medicine, etc.