**Boyles' law**

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

- substitue preceding expression for the volume term into the ideal gas equation, 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
- now, based on graphical analysis and the preceding equation, how to determine the number of moles of gas in the system and 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** [35 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]

- appropriate graph
- determination of the volume of the tubing & # moles of gas in the system
discussion [10 points]

- describe / list two high school

- NGSS science & engineering practices
and

**resources**

above image

writing mathematics