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# Pre Lab Pressure And Volume Relationships

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### Pre Lab Pressure And Volume Relationships

1. 1. Lab: Pressure and Volume Relationships of Gases
2. 2. Lab: Pressure and Volume Relationships of Gases <ul><li>The volume of any sample of gas will decrease when you increase its confining pressure. </li></ul><ul><li>The volume of any sample of gas will increase when you decrease its confining pressure </li></ul><ul><li>By how much? </li></ul>
3. 3. Lab: Pressure and Volume Relationships of Gases <ul><li>Objectives: </li></ul><ul><ul><li>to experimentally determine the relationship between the confining pressure on a sample of gas (small volume of atmospheric air) and its volume. </li></ul></ul><ul><ul><li>construct and interpret a graph of experimental data. </li></ul></ul>
4. 4. Lab: Pressure and Volume Relationships of Gases <ul><li>Safety: </li></ul><ul><ul><li>No goggles or aprons. </li></ul></ul>
5. 5. Lab: Pressure and Volume Relationships of Gases <ul><li>Assignment: </li></ul><ul><ul><li>Work in large lab groups of 3-4 students. Lab groups may not be larger than 4 students. </li></ul></ul><ul><ul><li>Cooperatively read and follow the procedure and collect pressure and volume data. </li></ul></ul><ul><ul><li>1 lab paper and 1 graph will be required per student. </li></ul></ul>
6. 6. Lab: Pressure and Volume Relationships of Gases <ul><li>Do not max out the pressure gauges. </li></ul><ul><li>Example Pressure Gauge </li></ul>
7. 7. Lab: Pressure and Volume Relationships of Gases <ul><li>There are two scales with two units of gas pressure indicated on these gauges. </li></ul><ul><li>Outer numbers represent pressure in units of millimeters of mercury (mmHg) in black. </li></ul><ul><li>Inner numbers indicate units of pressure in units of kilopascals (kPa) in red. </li></ul><ul><li>Example Pressure Gauge </li></ul>
8. 8. Lab: Pressure and Volume Relationships of Gases <ul><li>Syringes can contain volumes of liquids or gases ranging from 0 to 20 cubic centimeters (CC). </li></ul>
9. 9. Lab: Pressure and Volume Relationships of Gases <ul><li>This syringe is in the open position. </li></ul><ul><li>Estimate the volume contained within the syringe from the top of the inner piece. </li></ul>
10. 10. Lab: Pressure and Volume Relationships of Gases <ul><li>A syringe in the open position will be attached to a pressure gauge. </li></ul><ul><li>Do not over tighten the plastic connections. </li></ul><ul><li>Push and firmly hold the syringe into the tubing connected to the pressure gauge as you take pressure and volume readings. </li></ul>