More Intro to Gases Chemistry GT.

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Presentation transcript:

More Intro to Gases Chemistry GT

Drill Convert: 1.4 atm to mmHg 95.5 kPa to atm 16.0 lb/in2 to kPa 754.3 mmHg to lb/in2 HW: Finish Boyle’s and Charles’ Law lab questions and graphing

Objectives IWBAT Describe gases by their properties Discover the mathematical relationships in Boyle’s and Charles’ Law. Use the Combined Gas Law.

Date Announcements Tuesday 4/21 AM (B207) or PM (N211) – come for make-up tests/quizzes Wednesday 4/22 – NO Lion’s Time, SMOB and SGA elections Thursday 4/23 – PBIS (no, I don’t have a schedule) Friday 4/24 – Fandemonium Society Meeting in N211 

Agenda Drill Finish the Properties of Gases Charles’ and Boyle’s Law Online Lab & graphing Combined Gas Law Notes & Practice Problem Closure

Physical Properties of Gases Expansion -- no definite shape or volume Fluidity -- flows freely Low density Compressibility -- may be crowded together Diffusion -- spontaneous mixing of two gases Effusion -- particles under pressure can leak out of a tiny opening Standard Temperature and Pressure (STP): 1 atm, 273K

Boyle’s Law Online Lab Groups of 3 or 4 Go to msbloedorn.weebly.com > Chemistry > Unit 11: Gases > Charles’ Law Online Lab, Boyle’s Law Online Lab Record your data. When done, get a sheet of graph paper and graph all data on the same graph—Boyle’s Law. Charles’ Law on separate graph. Once everyone has data, we will move to the notes.

The Combined Gas Law The Combined Gas Law: P1V1 = P2 V2 T1 T2 Take an index card. Write PTV in large letters that fill the card. You may hole-punch the card or just draw large dots at the bottom. What happens when you hold one constant?? Example problem—Combined Gas Law WS

Exit Ticket A balloon contains 3.5 L of air at 4.0 atm of pressure. The balloon pops, letting the air out. The air is now at 1.0 atm. To what volume will it expand?