|
|
 |
|
|
TGN1:
|
|
 |
LINKS |
 |
|
|
|
|
What is a crystal?(1)
The content of this page is deliberately minimal
to give students chance to consider what they are looking
at and
what the common features of crystals might be, before seeing
‘the answer’.
What is a crystal?(2)
If you have already looked at some of the later pages on atoms,
you will notice that here we are just talking about
the particles of a substance without going into atoms and
structures. This will be good enough to explain what we want:
we only need to consider atoms when talking about chemical
changes, without adding unnecessary details.
Notes on ‘Think for yourself’ question
Why is a nice crystal a sign of a pure sample of a substance?
If all of the particles are the same
you can form a neat pattern. Mixtures of substances don’t
usually give the neat patterns needed to form crystals. You
do not see crystals of wood, for example.
|
|
|
|
|
| a
Science Enhancement Programme CD-ROM 2005 |
|
user
guide |
| |
|
|
|
|
