Pressure temperature relationship in gases lab answers vernier

Expt. 6 Pressure-Volume-Temperature Relationships in a Gas Objectives: 1. To investigate the relationship between pressure and volume for a confined gas. 2. To investigate the relationship between pressure and temperature for a confined gas. 3. To determine the value of absolute zero on the Celsius temperature scale. Introduction and Procedure Overview: Pressure, volume, and temperature are readily measured properties of a gas. Early scientists, such as Robert Boyle (1662) and Jacques Alexandre Charles (1787), noticed that these gas properties are interrelated. For example, Boyle observed that the volume of a gas decreased inversely with applied pressure (when the temperature of the gas is held constant). Charles found that the volume of a gas tends to increase linearly with temperature (when the confining pressure of the gas is held constant). These observations were eventually expressed in two simple mathematical relationships, now called Boyle’s Law and Charles’ Law. A gas that obeys these laws exactly is called an ideal gas. In this experiment, you will collect data that reveals how gas pressure varies with volume (Part A of the experiment) and temperature (Part B of the experiment). Measurements will be carried out using pressure and temperature sensors that are interfaced to a computer. You will be utilizing a computer software package called Logger Pro that allows you to read data directly into a spreadsheet. Once the data is collected, you will analyze and graph the data, and print a hardcopy for your lab report. Note: The experimental procedure listed below has been performed in the laboratory and recorded for your viewing. Your goal is to record the results from the information provided to allow you to accurately complete your calculation sheet. Part A: Pressure-Volume Relationship in a Gas (Atmospheric Air): 1. Prepare the Gas Pressure Sensor and an air sample for data collection. • • • With the 20 mL syringe disconnected from the Gas Pressure Sensor, move the piston of the syringe until the front edge of the inside black ring (indicated by the arrow in Figure 1) is positioned at the 10.0 mL mark. Attach the 20 mL syringe to the valve of the Gas Pressure Sensor. Now you have trapped a certain amount of air, which you will use for the experiment. Look at the syringe; its scale reports its own internal volume. However, that volume is not the total volume of trapped air in your system since there is a little bit of space inside the pressure sensor. The extra volume in the system is 0.8 mL. Consequently, the PressureVolume apparatus now contains a total volume of 10.8 mL of air at atmospheric pressure. (Remember that you will have to add this extra volume to the syringe volume for all of your data.) 2. Prepare the computer for data collection: Turn on the computer and one of the partners should log in.