questions i got wrong Flashcards
“The pressure of an ideal gas is inversely proportional to its volume”, is in incomplete statement of Boyle’s law.
State two conditions necessary to complete the statement.
- Fixed mass
- Constant temperature
State and explain what happens to the speed of molecules in a gas as the temperature increases.
The mean-square speed of molecules increases with absolute temperature as the mean kinetic energy is proportional to the absolute temperature.
(Ek mean=3/2 kT)
Describe one way in which the motion of the molecules of air inside the bicycle tyre is similar and one way in which it is different at two temperatures.
SIMILAR: the motion is random, the range of speeds
DIFFERENT: mean kinetic energy, root mean square speed, frequency of collisions
The temperature of an oven is kept constant during an experiment, however, the pressure decreases as the atoms leave through the exit hole.
Explain, using kinetic theory, why the pressure decreases.
[2 marks]
As atoms leave, there are less collisions per second but average momentum stays same hence change in momentum per second decreases.
Absolute zero of temperature can be interpreted in terms of the ideal gas laws or the kinetic energy of particles in an ideal gas.
Describe these two interpretations of absolute zero of temperature.
[2 marks]
Using the gas laws, it is the temperature at which the volume of a gas extrapolates to zero.
Using kinetic energy, absolute zero is the given point where kinetic energy is zero.
