GasesBW2 - Gases Petrucci Harwood and Herring Chapter 6...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
•1 CHEM 1000 3.0 Gases 1 Gases • Petrucci, Harwood and Herring: Chapter 6 CHEM 1000 3.0 Gases 2 • We will be looking at Macroscopic and Microscopic properties: – Macroscopic • Properties of bulk gases • Observable – Pressure, volume, mass, temperature… – Microscopic • Properties at the molecular level • Not readily observable – Mass of molecules, molecular speed, energy, collision frequency
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
•2 CHEM 1000 3.0 Gases 3 Macroscopic Properties • Our aim is to look at the relationship between the macroscopic properties of a gas and end up with the gas laws CHEM 1000 3.0 Gases 4 Pressure • To contain a gas you must have a container capable of exerting a force on it (e.g. the walls of a balloon). • This implies that the the gas is exerting a balancing force • Normally we talk about the pressure (force/area) rather than force
Background image of page 2
•3 CHEM 1000 3.0 Gases 5 Measuring Pressure • The simplest way to measure gas pressure is to have it balance a liquid pressure. • Therefore we need to quantify the liquid pressure CHEM 1000 3.0 Gases 6 A h • Consider a cylinder of liquid with area A and height h • The force exerted at the bottom of the cylinder is its weight F = m.g • The pressure exerted is P = F/A = m.g/A • The density of the liquid is d=m/V and m = d.V but V=A.h • So P = m.g/A = g.V.d/A = g.A.h.d/A = g.h.d
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
•4 CHEM 1000 3.0 Gases 7 Barometer To measure Atmospheric Pressure On the left the tube is open On the right the tube is closed
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 14

GasesBW2 - Gases Petrucci Harwood and Herring Chapter 6...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online