Charles' (gas) law                            honors chemistry

background [prelab assignment (15 points) due at the begining of lab]

Charles' law is

V = (n R / P) [°C + z]                                                    {eqn 1}

or

[°C + z] = (P / n R) V => °C = (P / n R) V - z                   {eqn 2}

using graphical analysis, how could Charles' law (shown above - either eqn 1 or eqn 2) be used to estimate the value of absolute zero (using the below materials) ?   as there is a slight difference in the analysis using eqn 1 versus eqn 2, explicitly state the equation used in your analysis, i.e. use both equations in your analysis.

use Boyle's law and the kinetic theory of gas to justify / rationalize the use of Charles' law to estimate the value of absolute zero.

purpose

estimate absolute zero (on the °C scale) using Charles' law

compare the validity of your estimate based on equation 1 versus equation 2

materials

syringe; grease

water, ice, NaCl (optional)

ring stand, metal ring; beakers; bunsen burner

temperature & pressure probes

methods / data analysis

student design

content of lab report [20 points]

data table

graphical analysis to determine absolute zero

statistical analysis (rather than using 1-anova, run multiple t-tests, where compare (i) equation 1 versus accepted value, (ii) equation 2 versus accepted value, and (iii) equation 1 versus equation 2)

accuracy in determination of absolute zero; refer to statistics to support your statement.

resource

Flinn video & handout [access 1/ 2014]