Pages in this set

Page 1

Preview of page 1
Gases
In gas calculations, temperature MUST be in KELVINS.

Boyle's Law pV = k Constant T: water boils at fixed
p= k temp.
V
Pressure inversely proportional
to volume
Charles's Law V =k Constant p: Prince Charles!
T
Volume proportional to temp
Pressure Law P =k Only one left! Constant:…

Page 2

Preview of page 2
Pressure Law




Explanation: pressure increased by temp. increase because average speed of molecule increased
due to heat= impacts on container walls harder and more often = increase temp.

For questions:

You will only ever need to use one law.

So, if you need to use Boyle's law, and the volume…

Page 3

Preview of page 3
Avagadro used to find how many molecules are in a gas using 1g of H. We now used 12g 12-C
isotope because hydrogen gas was impure and the isotope of H, which made it impure, was hard to
remove.

1u: 1/12th mass of 12-C.
1u = 1.661x10-27 kg

Page 4

Preview of page 4
pV = nRT

Page 5

Preview of page 5
pV = nkT




Mass MS of substance: Mn

Mass of ideal gas: MS: M( pV /RT )

Density of ideal gas: MS/V = pM/RT

Boltzmann constant : k= R/NA




Each impact on container wall causes a force on it. The force of many impacts is the cause of the
pressure…

Page 6

Preview of page 6
if temp of gas increased, molecules move faster on average. Distribution becomes flatter and
broader.



Root mean square speed:




Assumptions about kinetic theory equation:


Molecules are point molecules
Molecules don't have electrostatic forces - don't attract/ repel
Move in continual random motion
Elastic collisions ­ no overall loss of KE…

Page 7

Preview of page 7

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »