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TGB6:
Reviewing Ideas
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LINKS |
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Notes
on ‘Think for Yourself’ questions.
Students should notice that:
‘Which picture shows the sample at a higher temperature?
How do you know?’
Students should identify B as showing the sample at a higher
temperature and should offer some of the following
points:
B is in the liquid state – it must be above the melting
point; A is in the solid state so below the melting point;
A shows a lot of order - there is a pattern – so it
must be in the solid state; B shows no obvious pattern so
it must
be in the liquid state.
‘Which of A and B shows particles which have
more energy?’
B. (The particles are not in a fixed
pattern: they have enough energy to overcome the holding power
and move around)
‘ Is P above its melting point? Is Q above its
melting point? How do you know?’
P is below its melting point because
it is in the solid state – the particles are arranged
in a pattern; Q is above its
melting point because it is in the liquid state – there
is no order or pattern to the particles.
‘What is it about the particles that makes the
liquid state ‘runny’ when the solid state is not?’
It is the way the particles
move: in the solid state, particles stay in a fixed
position and can only vibrate; in the
liquid state particles can move past each other.
There is more about particles in the solid and liquid
states on the next page.
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Science Enhancement Programme CD-ROM 2005 |
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user
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