Graphing Gas Laws



Graphing Gas Laws Do all of these activities in your data book.

Boyle’s Law, (pressure vs. volume)

a. Graph, placing volume on X-axis using the data on Table A.

b. Connect the points. What equation best describes this line?

Charles’ Law (Volume vs temperature)

Using the data below, graph this relationship, placing temperature on the x-axis and volume on the y-axis. Be sure to title the graph and label the axes. The volume should go from 0 to the highest number. The temperature should go from -300 to +100 degrees Celsius.

Table A Table B

|Pressure L(atm) |Volume(L) | |Volume (L) |Temperature ° C |

|2.5 |10.0 | |20.0 |25 |

|3.5 |7.1 | |21.5 |45 |

|10.0 |2.5 | |22.7 |65 |

|15 |1.7 | |23.2 |85 |

|20.0 |1.25 | |24.5 |100 |

a. Connect the points with a best fit line.

b. What equation best describes this line?

c. Substitute V for “y” and T for “x” in this equation.

d. Extrapolate your line until it intersects the x-axis.

e. At what temperature is the volume of a gas zero, according to your graph?

“John’s” Law (Pressure-temperature)

Graph this relationship, using the data below. Place the temperature on the x-axis and pressure on the y-axis. Be sure to title the graph and label the axes. The pressure should go from 0 to the highest number. The temperature should go from -300 to +100 degrees Celsius.

|Pressure (pounds per sq. in.) |Temperature ° C |

|20.5 |100 |

|16.4 |25 |

|15 |0 |

|10.8 |-77 |

a. Connect the points with a best fit line.

b. What equation describes this line?

c. Substitute P for “y” and T for “x” in this equation.

d. Extrapolate your line until it intersects the x-axis.

e. At what temperature is the pressure of a gas zero, according to your graph?

1. How would the equations in Charles’ and John’s laws change if the x intercept was zero?

2. What is the purpose of the Kelvin temperature scale? (from lecture)

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