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1 Chemistry Gas Unit

Chemistry Gas Unit Grade 11 side 1

Solid (4) • definite shape and volume • virtually incompressible • does not flow easily • strong attractive forces between molecules
Liquid (5) • assumes shape of container • definite volume • virtually incompressible • flows easily • moderate attractive forces between molecules
Gas(4) • assumes shape and volume of container • highly compressible • flows easily • weak attractive forces between molecules
Kinetic Molecular Theory of Gases(5) 1. Gases made small particles called molecules. 2. Gas molecules very far apart compared with size. Sample of gas mostly empty space. 3. Gas molecules = constant fast motion. Collide with each other and with the walls of the container. 4. Particles col
Ideal Gas Hypothetical gas with particles that have mass but no volume or attractive forces between them. (ie. Obey the kinetic molecular theory of gases).
Gas Pressure Force gas exerts on walls of container. The more collision with the walls, the higher the pressure.
Atmospheric Pressure Pressure exerted by a column of molecules reaching from the top of the atmosphere to the earth.
Standard Atmospheric Pressure (SAP) = 760 mmHg = 760 torr= 1 atmosphere (atm)= 101.3 kPa
Temperature scales • 0 C = 273 Kelvin (K)
Absolute zero = 0 K All kinetic molecular motion stops and a compound has zero kinetic energy
SATP Standard Ambient Temperature and Pressure • 25 C and 100 kPa • One mole of an ideal gas at SATP is 24.8L
STP Standard Temperature and Pressure for Gases • 0 C and 1 atm • One mole of an ideal gas at STP is 22.4L