LECTURE 6.3 – BOYLE’S LAW

Today’s Learning Targets LT 5.3 – I can define what STP is on an exit ticket LT 5.4 – I can discuss how the kinetic energy of a gas molecules is related to the temperature of the gas mixture on an exit ticket LT 5.5 – I can define what absolute zero and relate it to the Kelvin temperature scale on an exit ticket LT 5.6 – I can convert between the Kelvin and Celsius temperature scales on an exit ticket LT 5.7 – I can explain Boyle’s Law, how it relates pressure and volume, and I can calculate pressure and volume values for a given problem on an exit ticket

What is Boyle’s Law?

I. Boyle’s Law If we keep temperature constant, then volume and pressure are inversely related. As one goes up the other goes down If the container gets larger the gas molecules are hitting the walls at a less frequent rate. Therefore, by decreasing the volume of a container, we are increasing the pressure.

Boyle’s Law

This is an inverse relationship! As one goes up the other goes down! Graph of Boyle’s Law This is an inverse relationship! As one goes up the other goes down!

How do we calculate pressure and volume?

How do we calculate pressure and volume?

I. Boyle’s Law Equation Boyle’s Law states that pressure and volume are described by the equation: PiVi=PfVf

Class Example A given sample of gas occupies 523 mL at 1 atm. The pressure is increased to 2 atm, while the temperature remains the same. What is the new volume of the gas?

Table Talk A sample of oxygen has a volume of 500 mL at a pressure of 2 atm. What will the volume be if the pressure is increased to 5 atm?

Stop and Jot A sample of as in a syringe has a volume of 10 mL and a pressure of 6 atm. What is the new volume if the pressure is decreased to 3 atm?