CHMA10H3 Chapter Notes - Chapter 5: Ideal Gas Law, Kinetic Theory Of Gases, Gas Constant

• School: UTSC
• Department: Chemistry
• Course: CHMA10H3
• Professor: Nirusha Thavarajah

Document Summary

Section 5. 2: pressure - the result of molecular collisions. Result of constant collisions between atoms or molecules in a gas and surfaces around them is pressure. Pressure that gas sample exerts is the force per unit area that results from the collisions of gas particles with the surrounding surfaces - pressure = force/area or p/a. Pressure of a gas sample depends on several factors, including the number of gas particles in a given volume because the less particles there are, the lower the pressure. Pressure decreases when altitude increases because fewer molecules per unit volume of air. Mmhg (torr) unit is common, originates from barometer measurements. Barometer: evacuated glass tube, tip is submerged in mercury. Also used: pascal (pa), atmosphere (atm), bar. The manometer: a way to measure pressure in the lab. U-shaped tube containing a dense liquid, usually mercury. One end of the tube is open to atmospheric pressure and the other is attached to a.