WARM UP “We never touch people so lightly that we do not leave a trace.” – Peggy Tabor Millin What does this mean to you? How can you use this idea in.

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Presentation transcript:

WARM UP “We never touch people so lightly that we do not leave a trace.” – Peggy Tabor Millin What does this mean to you? How can you use this idea in your daily life at school?

The Big Bang Theory

Properties of Gases Chemistry II

Gas Molecules All compounds can be in the gas state Many need extreme temperature

Gas Molecules Some compounds are gases under “normal” conditions Covalent compounds with weak intermolecular forces O2, CO2, NO2, CH4, etc.

Characteristics of Gases Change shape and volume Highly compressible Mix evenly and completely Very low density

Pressure of a Gas Gases exert pressure Moving molecular fluid Pressure from all sides

Pressure of a Gas Pressure in a system / reaction Can measure pressure with a manometer Unit: mmHg

Pressure of a Gas Example:

Pressure of a Gas Atmospheric pressure From weight of a column of air Measured with a barometer Unit: mmHg

Pressure Measurements Newtons (N) Issac Newton F = ma (force = mass x acceleration) kg·m/s2

Pressure Measurements Pascals (Pa) – the SI unit Blaise Pascal Pressure = force / area N/m2

Pressure Measurements Atmospheres (atm) – Equation unit 1 atm = 1.01325 x 105 Pa

Pressure Measurements mmHg (a.k.a. torr) – Measurement tool unit Evangelista Torricelli 760 mmHg = 1 atm

WRAP UP Gases are _________ compressible and have a very _________ density. Explain why these two properties are related.