2. 1 Boyle’s Law Robert Boyle 1621 - 1691

3. 2 Boyle’s Law Defined Temperature is constant Volume occupied by a gas varies inversely with the applied pressure Equation: P 1 V 1 = P 2 V 2

4. 3 P T V If P, then V Reminder: Boyle’s Law has constant temp.

5. 4 Pressure vs. Volume Pressure is inversely proportional to volume

6. 5 Solving Word Problems Step 1. Write given information.  Example: P 1 = 1 atm V 1 = 40 mL P 2 = 2 atm V 2 = ? Problem: If the original pressure of a gas is 1 atm with a volume of 40 mL, what is the new volume when the pressure is increased to 2 atm?

7. 6 Solving Word Problems Step 2: Use given information to determine what equation to use.  Example: P 1 V 1 = P 2 V 2 Given Info: P 1 = 1 atm V 1 = 40 mL P 2 = 2 atm V 2 = ?

8. 7 Solving Word Problems Step 3: Isolate the missing variable by re-arranging the equation  Example: Isolate V 2 P 1 V 1 = P 2 V 2 P 2 P 2 Boyle’s Law Equation

9. 8 Solving Word Problems Step 4: Plug-in the given values & solve.  Example P1V1P1V1 P 2 = V 2 (1 atm)(40 mL) (2 atm) 20 mL = V 2

10. 9 Good Work! Congratulations! You finished the first example problem using Boyle’s Law.

11. 10 Raise your hand if you feel like screaming? Don’t worry …we’re not finished with Boyle’s law problems. Let’s try a few more problems together on the chalkboard.