1
Q
Equations for all the gas laws
A
p=kT
p=k/V
V=kT
V=kn
2
Q
Assumptions of ideal gas
A
- Consists of a large number of molecules
- Molecules are in constant random motion
- Molecules collide elastically with container and with each other
- Duration of collision is negligible to time interval btwn collisions
- No intermolecular forces of attraction except during collisions
- Total volume of molecules negligible compared to total container volume
3
Q
Explain how random motion of gas molecules exert pressure on wall
A
- Molecules are in constant random motion
- Molecules collide with wall
- Direction of velocity and hence momentum changes during collision
- By N2L, force is exerted by wall on molecules
- By N3L, force is exerted by molecules on wall
4
Q
Explain why ideal gas does not have potential energy
A
Absence of intermolecular forces of attraction so there is zero potential energy
5
Q
What is microscopic kinetic energy affected by
A
Temperature
6
Q
What is microscopic potential energy affected by
A
Phase
7
Q
State the first law of thermodynamics
A
Increase in internal energy of a system is equal to the sum of heat supplied to the system and the work done on the system
8
Q
Describe work done if volume of gas increases
A
Work done by gas
8
Q
Describe work done if volume of gas decreases
A
Work done on gas
9
Q
Under what conditions does a real gas behave like an ideal gas
A
- Low pressure and high temperature
- At low pressure, total volume of molecules is negligible compared to container volume
- At high temp, molecules have high kinetic energy so intermolecular forces of attraction are negligible
H2 Physics
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