Boyle's Law Chemistry

background [prelab assignment (10 points) due at the beginning of the lab

1. describe / rationalize the use of graphical analysis to determine the # moles of gas in the system & volume of the tubing.

hints:

• what is the ideal gas equation (it incorporates Boyle's law) ?
• what is the relationship between the volume term in the ideal gas equation, the volume of the tubing, and the volume of the syringe ?   hint: see below figure

• "combine" both of the preceding equations (i.e. solve for the volume term in both of the preceding equations, then apply the transitive property), then solve for the volume of the syringe.
• identify the constants (i.e its value does not change during the experiment) and variables (i.e. its value does change during the experiment) in the preceding equation; there are 2 variables
• visualize the graph of the preceding equation, which would be a line if the variables are defined appropriately.
• relate the parameters of the equation describing the graph to (i) the number of moles of gas in the system and (ii) the volume of the tubing.

2. sketch a data table for your experimental measurements (i.e. review the purpose & content of your lab report)

purpose

determine the volume of the tubing

determine the number of moles of gas in the system

fulfill various aspects of the NGSS science & engineering standards.

materials

syringe; tubing; pressure transducer; data collection system; thermometer

methods / data analysis

student design

Content of lab report (40 points)

introduction  [10 points]

• basis of determining the volume of the tubing & number of moles of gas in the system using graphical analysis; use equation editor and appropriate mathematics style (see below link about writing mathematics)

methods  [5 points]

• self-explanatory

results  [10 points]

• graphs:  V vs. P;  V vs. 1 / P
• determination of the volume of the tubing & # moles of gas in the system

discussion  [15 points]

• is the experimental data consistent with Boyle's law ?  Justify your answer by referring to both graphs (relationship between pressure versus volume; 1 / P versus V).
• describe / list two high school
• NGSS science & engineering practices

and

that correlates to an aspect of this laboratory activity; provide an example in the lab or this lab report that meets these practices. include in-text citation & a bibliography / refererence list.
resources

lab activity source (examples):  site 1  &  site 2  [access 4 / 2009]

above image

writing mathematics