1 / 14

The Gas Laws

The Gas Laws. 4-18-10 Cornell Notes Worksheet Relay. Agenda. Do Now Cornell Notes (3 gas laws) Practice Relay. Remember…. Gases have four different properties we can measure in numbers: Volume Temperature Number of moles Pressure

job
Download Presentation

The Gas Laws

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Gas Laws 4-18-10 Cornell Notes Worksheet Relay

  2. Agenda • Do Now • Cornell Notes (3 gas laws) • Practice Relay

  3. Remember… • Gases have four different properties we can measure in numbers: • Volume • Temperature • Number of moles • Pressure • According to Kinetic Molecular Theory, gases have these properties because they are made of moving particles.

  4. Why are we learning about gases? • Gases affect our lives in many ways • We need it to survive (oxygen) • Air pressure is responsible for our ears and lungs to function • To predict these behaviors, we need to be able to use the three gas laws that gases obey.

  5. Boyle’s Law P α 1/V • Pressure and volume are INVERSELYproportional if moles and temperature remain constant • When Pressure increases, Volume decreases and vice versa Robert Boyle (1627-1691). Son of Earl of Cork, Ireland. P1V1 = P2V2

  6. Example: If the pressure of a gas starts at 6 atm and it’s volume is 5.0 L, what happens to the pressure when the volume increases to 15.0 L? P1V1 = P2V2 Before After (P2) (15.0 L) (6 atm) (5.0 L) = (15.0 L) (15.0 L) If we change the volume, the pressure changes to 2atm

  7. Boyle’s Law • A bicycle pump is a good example of Boyle’s law. • As the volume of the air trapped in the pump is reduced, its pressure goes up, and air is forced into the tire.

  8. Charles’s Law V α T • Volumeandtemperatureare DIRECTLYproportional IF moles and pressure remain constant • When volume increases, Temperature increases Jacques Charles (1746-1823). Isolated boron and studied gases. Balloonist. V1 = V2 T1T2

  9. Example: If the volume of a gas is 4.0 L and it’s temperature is 50 K, what happens to the volume if the temperature changes to 75 K? V1 = V2 T1T2 Before After 4.0 L V2 = 50 K 75 K If we change the temperature, the volume changes to 6.0 L

  10. Charles’s Balloon • Heat up the air (raise the tempreature), the volume increases (balloon inflates)

  11. Gay-Lussac’s Law P α T • Pressureandtemperatureare DIRECTLY proportional IF moles and volume remain constant • When Pressure increases, Temperature increases Joseph Louis Gay-Lussac (1778-1850) P1 = P2 T1T2

  12. Example If the pressure of a gas is 5.0 atm and the temperature is 50 K, what will the temperature be if the pressure decreases to 3.0 atm? P1 = P2 T1T2 Before After 5.0 atm 3.0 atm = 50 K T2 If we change the pressure, the temperature drops to 30 K

  13. Combined Gas Law • Good news! We don’t have to memorize all three laws! Since they’re all related, we can combine them into ONE equation! • If you only need one of the other gas laws, you can cover up the item that is constant and you will get that gas law! • = P1 V1 P2 Boyle’s Law Charles’ Law Gay-Lussac’s Law V2 T1 T2

  14. Practice • Complete the worksheet problems on a SEPARATE sheet of paper • Have Ms. Akagi check your work after each round BEFORE you move on to the next round!

More Related