Thames & Kosmos Hot Ice Crystals handleiding

Niet gecategoriseerd

Thames & Kosmos

20 pagina's

PDF beschikbaar

Handleiding

Let’s imagine an Egyptian pyramid

to illustrate how crystals grow. The

Great Pyramid of Giza, for example, is

made of over two million rectangular

blocks that are layered on top of one

another to form a pyramid shape.

This is much like how a crystal is

built up, except that its building

blocks are extremely tiny. They are

not much bigger than atoms. Those

crystal building blocks are called unit

cells. Some units cells are molecules

— groups of atoms put together in

speciﬁc patterns. An example of this

would be the sugar crystals in rock

candy. Other unit cells may simply

be identical atoms (for example,

diamond crystals are made of carbon

atoms). And then there are unit cells

made out of ions — electrically

charged atoms or groups of atoms.

There are positively and negatively

charged ions, which attract each

other and stick together like the

north and south poles of magnets.

Materials made out of ions are called

salts. Examples include table salt and

the sodium acetate in this kit.

Each unit cell has a shape unique to

the material that composes it. The

shape is determined by the unit cell’s

component parts, their arrangement

relative to one another, and the

strength of the forces of attraction

GEEK

OUT!

HOW DO CRYSTALS

“KNOW” HOW TO GROW?

holding them together. Some are

cube-shaped, others rectangular or

rhomboid. All the components always

strive to pack together as tightly as

possible and to use as much of the

available space as they can — a result

of the strong forces of attraction

between them.

Just like the pyramid with its millions

of blocks, crystals grow through the

accumulation of these unit cells. Of

course, if a unit cell has the shape of

a cube, it does not necessarily mean

that the resulting crystal will also

be cube-shaped. After all, a

pyramid is made out of

rectangular blocks,

not pyramid-shaped

blocks.

Bekijk gratis de handleiding van Thames & Kosmos Hot Ice Crystals, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.