b. Dependent Variable: pressure

c. Control Variable: volume

2) Pressure and temperature have an indirect relationship.

3) If the test tube had leaked, gas molecules would have

escaped, so the pressure value would go down as there

would be less molecules constituting pressure in the

flask.

4) You would expect to see greater deviations from the

ideal gas law under low temperatures and high pressures.

a) At low temperatures, gas molecules are not in rapid

constant motion like the ideal gas law states. b) At high

pressures, the molecules are closer together and collide

more frequently, also going against the ideal gas law's

predictions of elastic collisions and mostly empty space

constituting the volume.

6-9) (see graph to the right --> )

*for number 6, refer to the data tables for the Kelvin values

of specifically chosen data points from each part of the lab)

Using an appropriately sized stopper, attach the pressure sensor tubing and 

calibrate to Sparkvue as necessary.

2) Add 48 mL of water to the flask.

3) Assemble a ring stand with the hot plate on its platform. Clamp the 125 mL flask 

to the ring stand and position it atop the hot plate, as far toward the center as possible

for maximum heating.

4) Heat the water in the flask until it boils, and then record your temperature and 

pressure data from the gas formed.

2) Fill it with 800 mL of water and add 10 ice cubes to the water.

3)Submerge the 125 mL flask into the ice bath. Record temperature 

and pressure as it changes with the change in temperature.

• Temperature probe

• Pressure sensor

• Sparkvue

• iPad

• Hot plate

• Water

• 125 mL flask

• Ring stand

• Rubber stopper

• Ring stand clamp

• Ice

• 1000 mL beaker