Centrifuge

Centrifuge

• an apparatus that separates heterogeneous mixtures
• moves dense objects to the bottom
• and liquids to the top

Crystalisation

A Crystal

• is a solid structure with flat sides
• can be formed by many different substances
• one way: concentrated solution then heat = cool and crystal

Crystal in the World

• some believe that crystals can improve your health
• Does anyone know of an idea their family believes about a certain stone or crystal?
• Ex. Petrified Wood- live a long life

Chromatography

Chromatography

• How does it work?
• Why does it separate the colours?
• How can this be used in life?

There is a been a murder!

How does it work?

• the ink is different solutes
• the water is the solvent
• the solutes have different levels of solubility
• the more soluble the solute, the further it will travel up the filter paper

Activity

• Choose a colour and grab a table sheet
• Grab a filter paper slip
• Predict on the table what colours you think will make up the colour you chose.
• Draw a line on bottom of the filter slip
• Put the paper in water hanging over the edge out of the water
• Record the colours that separate.

Why do you think there was a difference from your prediction and your results?

Problem: somebody put too much sugar in some warm water, you need to separate the sugar from the water!