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TGP2:
Temperature and concentration effects
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Notes on ‘Think for yourself’ questions
Which sample has the lowest concentration of particles?
A. It has the fewest particles in
the same volume.
Which sample has the highest temperature?
B. The particles are moving faster
in this sample than in A or C.
Put the samples in order of increasing pressure: explain your
reasoning.
B has most pressure, then C, and
A has the lowest pressure. The pressure depends on the concentration
of the
particles and also on the temperature: the higher the concentration
of particles the higher the pressure and the
higher the temperature the higher the pressure.
Why does pressure increase with concentration?
There will be more particles hitting
the same area in a given time. The more ‘hits’,
the bigger the force on that area so the bigger the pressure.
What does increasing the temperature do to the particles?
It makes them move faster.
How does this make the pressure increase?
When particles are moving faster,
they hit the walls harder, so this makes
the pressure increase.
If the particles are moving faster there are more ‘hits’
on the same area in a given time, which would also make
the pressure increase.
(The effect of the increased force of each ‘hit’
is more significant than that of the increased hit frequency,
however).
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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