Structure and properties
Allotropes of sulfur
A demonstration of the preparation and properties of the allotropes of sulfur enables students to study the relationship between structure and properties.
Chocolate and structure
In this experiment pre-melted and ordinary chocolate are tasted and their melting points tested.
Electrolysis of zinc chloride
Demonstration showing that an ionic compound will not conduct electricity when solid, but will do so when molten.
Making a plastic from potato starch
In this experiment a plastic film is made from potatoes.
Making an alloy (solder)
In this experiment students make an alloy (solder) from tin and lead and compare its properties to those of the pure lead.
Modelling alloys with plasticine
In this straightforward experiment students model the behaviour of an alloy using plasticine and sand.
Solid mixtures - a tin and lead solder
The melting points of tin, lead and a tin-lead solder are compared.
The density of ice
The unusual density of ice compared to liquid water is brought out vividly in this quick and simple demonstration.
Water expands when it freezes
This demonstration shows that water expands when it freezes. It is useful for explaining how rocks can be broken up when they absorb water.
Which substances conduct electricity?
This experiment looks at covalent and ionic compounds, and which conduct electricity.