Example+Lab+Write-Up+for+Gas+Laws

=**Gas Laws** August 30, 2011=


 * Purpose:** show an inverse relationship between pressure and volume.


 * Materials:**

__Equipment__ TI 84+ Graphing calculator gas pressure sensor temperature probe (4) 1-L beakers hot plate

__Chemicals__ water, ice


 * Procedure:** as described in Lab #6 & 7 of __Chemistry with Calculators__ by Holmquist, Randall & Volts, Vernier Labs.


 * Data:**

Boyles's Law Group Data
 * Volume (mL) || Pressure (kPa) || P/V or P*V ||
 * 5 || 200.0 || 1000.0 ||
 * 10 || 100.0 || 1000.0 ||
 * 12.5 || 80.0 || 1000.0 ||
 * 15.0 || 66.7 || 1000.0 ||
 * 17.5 || 57.14 || 1000.0 ||
 * 20.0 || 50.0 || 1000.0 ||


 * Data Analysis:**

Questions: 1) When volume doubles, pressure drops by 1/2. 2) When volume is halved, pressure doubles. 3) When volume triples, pressure drops to 1/3 of its original value. 4) This is an inverse relationship because the graph is curved instead of linear. 5) The fomula for this relationship is k=P*V


 * Conclusion:**

The data show that pressure is inversely proportional to volume. any change in one variable will produce the opposite change in the other variable but with the same magnitude. A regression analysis should be conducted to determine the accuracy of the data.