AP Physics 2 Unit 2 Lab

Elisa Alvarado, Sarah Cratem, Ryan Partain, Julia Reidy

Mr. Thomas

AP Physics 2 cmod

9 September 2015

Unit 2: System of Ideal Particles Lab Report

Objective: To determine the effect of pressure of a system on number of particles, volume, and temperature of the system.

Apparatus:

Procedures:

Pressure vs. Volume:

1. Hook up a syringe to a pressure sensor and take a flask with a stopper attached to it. Attach one hole to the pressure sensor and keep the other end open to be able to open and close it.
2. Fill the syringe up halfway and fill the container and inject the syringe directly into the container.

Pressure vs. Number of Particles:

1. Fill the container up to 20 mL.
2. Open the valve.
3. Fill up syringe halfway. Empty the syringe into the container.
4. Close the valve.
5. Repeat steps 2-4.

Pressure vs. Temperature:

1. Start with close to boiling water.
2. Place the flask and thermometer in a water bath, making sure the water is close to boiling point.
3. Put the magnetic stirrer at bottom of water bath.
4. Submerge the flask in water with the magnet spinning and leave it until it hits equilibrium.
5. Measure the temperature of the water bath.
6. Connect a single-hole stopper to a pressure sensor and measure the pressure.
7. Place small handfuls of ice into water bath and wait until it hits equilibrium.
8. Measure the temperature of the water bath.
9. Repeat steps 2-8.

Data Tables:

Graphs:

Number=(5.577kPa/#)(pressure)-(569.017)

Temperature=(4.681kPa/°C)(pressure)-(401.957°C)

Volume=(875.922mL/kPa)/pressure

Conclusion:

Pressure and volume are inversely related and their relationship can be described in this experiment with the equation Volume=(875.922mL/kPa)/pressure. This forms an inverse graph. Temperature and pressure are directly related and their relationship in this experiment can be described with the equation Temperature=(4.681kPa/°C)(pressure)-(401.957°C). This creates a positive linear graph. Number and pressure are also directly related and can be described with the equation Number=(5.577kPa/#)(pressure)-(569.017) in this experiment.  This also creates a positive linear graph. All of the relationships can be described together with the equation PV=nRT, where volume is measured in liters, pressure is measured in atmospheres, n is the number of moles, the temperature is measured in Kelvin, and R is a constant.  This equation can also be written in another form to work with different units (Pascals for pressure, cubic meters for volume, particles rather than moles, and a different constant, k): PV=NkT.