Powerpoint Presentation for Boyles law..

Boyle's Law states that if the pressure increases the volume decreases

1. Boyle’s Law by: Anne Loquenario

2. At the end of this lesson, the students should be able to; Qualitatively relate the pressure to volume of gases. Construct the mathematical relation of the pressure and volume of gases. Apply Boyle's law to practical problems. OBJECTIVES:

3. Guide Questions: 1.When you inhale what happen to your lungs? 2.What about when you exhale what happen to your lungs? INHALE EXHALE !

4. “Volume-Pressure Relationship in Gases” Procedure: a.Fill a syringe with air by pulling the plunger up. b.Press your finger against the end of the tip of the syringe to trap the air. c.Push the plunger in. Try again but press harder this time. ACTIVITY

5. 1.What have you observed? 2.Is the trapped air in the syringe affected by the added pressure as you press down the plunger with minimal force? 3.How do you relate the pressure (ex., applied force) to the volume or compressibility of air in the syringe? Guide Questions:

6. ROBERT BOYLE (1627-1691)

7. He performed an experiment wherein he trapped a fixed amount of air in the J-tube, he changed the pressure and controlled the temperature and then, he observed its effect to the volume of the air inside the J-tube. He found out that as the pressure is increased, the volume decreases. He finally concluded that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature.

8. Boyle’s Law states that pressure is INVERSELY PROPORTIONA L to the volume at constant temperature when the volume increases, pressure decreases. When the volume decreases, the pressure increases.

9. P-V diagrams Represent the changes in pressure of a gas with respect to its volume provided that temperature and amount of gas remains constant.

10. Pressure-Volume Relationship of Gases Macroscopic Properties of Gases Pressure is the force applied per unit area by the gas molecules as they hit the walls of the container. Volume is the space occupied by the gas molecules. The volume of a gas depends on the container.

11. Boyle’s law states that the pressure of a gas at constant temperature is inversely proportional to its volume. It can also be stated in one of two ways: As the pressure of a gas increases at constant temperature, its volume decreases. As the pressure of a gas decreases at constant temperature, its pressure increases.

12. Boyle’s Law For a given initial and final pressure and volume, the relationship is given by;

13. Boyle’s Law Shows pressure-volume relationship at constant temperature and moles of gas:

14. Boyle’s Law Calculations P 1 V 1 = P 2 V 2 P 1 = Initial Pressure P 2 = Final Pressure V 1 = Initial Volume V 2 = Final Volume

15. Always check the units of volume and pressure. You cannot use Boyle’s law if the units of the initial and final volumes and pressures are different. Convert the units when necessary.

16. 1. A tank of argon gas has a pressure of 5.00 atm and a volume of 10.00 L. What will be its pressure (in atm ) if it was transferred to another tank with a volume of 20.00 L? Examples

17. A gas with an unknown composition was contained in a 500 mL container and gave a pressure of 0.75 bar. What will be its final pressure (in bar) if it was moved to a 2.00 L tank?

18. Why is pressure not proportional to the volume? Abstraction/ Generalization

19. Cite examples in your everyday life where Boyle’s Law is applied/ observed. Application

20. A. Get ½ sheet of paper, choose your partner. Solve the problems given below. Express your answer in 3 significant figures. 1. A gas with an unknown composition was contained in a 500 mL container and gave a pressure of 0.75 bar. What will be its final pressure (in bar) if it was moved to a 2.00 L tank?

21. B. Write true if the statement is correct. Otherwise, write false. ___________________1 . Boyle’s law will only apply if the temperature of the gas remains constant. ___________________2 . The pressure of a gas will increase if transferred to a larger container while keeping the temperature and amount of gas constant. ___________________3 . The initial and final volume units should always match before using Boyle’s law for computation.

22. Read in advance the Charles Law ASSIGNMENT