Chem Today: States of Matter & Intermolecular Forces

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Presentation transcript:

Chem Today: States of Matter & Intermolecular Forces Take out your laptops Go to: bit.ly/MatterPhet. Click on “States”. Complete the front side of today’s handout using the simulation

Intermolecular Forces Forces of attraction between molecules (dotted lines represents attraction between water molecules)

Butane Demo

Pressure: Atmospheric Pressure=pressure exerted by the air above a surface Vapor Pressure=pressure exerted by the molecules at the surface of the liquid; (they want to escape to the gas phase) VAPOR ATMOSPHERIC

VAPOR ATMOSPHERIC Boiling point of a liquid: vapor pressure = atmospheric pressure

Syringe Demo

: VAPOR PRESSURE = ATMOSPHERIC PRESSURE =NORMAL BOILING POINT - - - STANDARD ATMOSPHERIC PRESSURE also = 1 atm : VAPOR PRESSURE = ATMOSPHERIC PRESSURE =NORMAL BOILING POINT

1. What happens to the vapor pressure of a substance when the temperature increases? IT INCREASES

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