Properties Of Gases Flashcards
What is a gas?
A gas is a substance that has no well-defined boundaries but diffuses rapidly to fill any container in which it is placed
What is a gas?
A gas is a substance that has no well-defined boundaries but diffuses rapidly to fill any container in which it is placed
How do you convert celsius into Kelvin?
Add 273 degrees
What is normal atmospheric pressure?
1 x 10^5 Pa = 100kPa
What does 1 cubic decimeter equal?
1 dm^3 = 1000 cm^3 = 1L
What is standard pressure?
1 x 10^5 Pa = 100kPa
What does Boyle’s Law state?
At constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure
What does Chares’ Law state?
At constant pressure, the volume of a fixed mass of gas is directly proportional to its temperature measured on the Kelvin scale
What does Gay-Lussac’s Law of combing values state?
4
It states that in a reaction between gases,
The volumes of the reacting gases and the volumes of any gaseous products
Are in the ratio of small whole numbers
Provided the volumes are measured at the same temperature and pressure
What does avogadro’s law state?
That equal volumes of gases contain equal numbers of molecules under the same conditions of temperature and pressure
How much volume does one mole of any gas occupy at s.t.p?
22.4L
What is an ideal gas?
One that perfectly obeys all the assumptions of the kinetic theory of gases under all conditions of temperature and pressure
How do real gases differ from ideal gases/what are real gases?
(2)
Forces of attraction and repulsion do exist between the molecules
The volume of the molecules is not negligible
List four assumptions of the kinetic theory of gases
Gases are made up of particles that are in continuous rapid, random motion, colliding with each other and with the walls of the container
There are no attractive or repulsive forces between the molecules
The gas molecules are so small and so widely separated that the actual volume of all the molecules is negligible compared with the space they occupy
When molecules collide the collisions are perfectly elastic - there is no loss of kinetic energy in these collisions but there may be a transfer of energy between the colliding particles
Give two limitations of the kinetic theory of gases
All real gases do have tiny attractive or repulsive forces between the molecules of the gas - NH3 is polar - it has attractive intermolecular forces
Under high pressure when molecules are crowded closer together, it is clear that their volume is not negligible compared with the distances between them
