Boyle's Law22 Lesson Plan

December 07, 2009 Lesson Plan in Chemistry I. Learning Competencies Behavior of Gases: Boyle’s Law II. Learning Objectives At the end of the teaching learning activity, 80% of the students should be able to: • describe the relationship between pressure and volume; • find pressure or volume, given the initial and final states of the gas and make calculations using Boyle’s Law; • relate volume of work that they can do when they are under pressure. III. Subject Matter A. Topic: Boyle’s Law B. Materials:10-ml syringe, water, plastic bottle C. Concepts: • Boyle’s Law states that at constant temperature, pressure is inversely proportional to volume. = in honor of Robert Boyle • Formula: P1V1=P2V2 Where: P1= the initial pressure of the gas; P2=final pressure; V1=initial volume; V2= final volume of the gas D. Reference: Mendoza Estrella E. et.al. Chemistry. 2nd Edition. Phoenix Publishing House. 2001. Mendoza Estrella E. Chemistry.Phoenix Publishing House.2003 Nudo Leogarda P. et.al Science_HS. Com. Bookman Inc.2003 IV. Learning Task A. Preparatory Activity/ies 1. Prayer 2. Classroom Management 3. Checking of Attendance 4. Energizer 5. Daily News B. Review/ Drill Unlocking of difficulties: Pressure-force exerted per unit area. Volume-space occupied by gas

Diffusion-spontaneously spreading out of molecules from greater concentration to lower concentration. C. Motivation Role Play: Liquefied Gas Petroleum explosion scene. D. Lesson Proper Activity: Boyle’s Law 1.Put weight of water three times. 2. Record the volume of gas in the syringe every time you put pressure. 3. Plot the weight of water versus the volume of the gas. V P E. Concept Formation 1. What happened to the volume when more weights were added? (The volume decreases) 2. How do you describe the relationship of pressure and volume at constant temperature? 3. What is the formula of Boyle’s Law? Activity Exercises: 1. A fixed amount of gas occupies a syringe with a volume of 5.0 L. The pressure is 1.00 atmosphere. What will be the new pressure if the volume is 4.0L at the same temperature? 2. A sample of oxygen gas (O2) has a volume of 8.0 L and a pressure of 1.0atm. What is the new pressure if the volume is decreased to 2.0 L? F. Generalization Volume of a gas is inversely proportional to its pressure, when the temperature and amount of gas are constant. G. Valuing/ Application 1. Gas cylinders, LPG tanks and oxygen tanks are made of very strong materials like steel. Why woods glass, plastic and ordinary are tin cans not be used for gas storage? 2. What do you feel when you are working under pressure? H. Evaluation Direction: Analyze the question carefully and answer it correctly. Choose the letter of the correct answer. 1. How do you explain the relationship of volume and pressure of gas at constant temperature? a. volume increases as the pressure decreases b. volume and pressure decrease c. volume and pressure increase

d. decrease then increase 2. A certain amount of gas at 25 C occupies a container with an adjustable volume. It currently has a volume of 10.5 L., with a pressure of 1.5atm. What would its volume be if the pressure were adjusted to 1.2 atm? a.13.1 L b. 12.1 L c. 10.2 L d. 131 L 3. The gas explosion is due to ______? a. evaporation b. diffusion c. condensation d. sublimation V. Assignment Motive Question: What do you think is the relation of volume and temperature at constant pressure? Guide Question: What is Charle’s Law? Bring materials for the next lesson: Balloon, alcohol lamp, test tube Reference: Nudo Leogarda P. et.al Science_HS. Com. Bookman Inc.2003

Prepared By: Ginalyn P. Bramaje