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The Equilibrium Between Bismuth Oxide Chloride and Bismuth Trichloride

In this classic demonstration, from the Royal Society of Chemistry, bismuth oxide chloride is dissolved in hydrochloric acid to give a clear solution of bismuth trichloride. Diluting the solution with water re-forms bismuth oxide chloride, a white solid. On adding more acid, the bismuth trichloride re-forms.

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The Electrical Conduction of Silicon – a Semiconductor

In this classic demonstration, from the Royal Society of Chemistry, silicon is connected in series with a power pack and ammeter. At room temperature, a very small current flows. This can be increased by heating the silicon with a hairdryer and this can be compared with a coil of copper when the current will...

Turning ‘Red Wine’ into ‘Water’

In this classic demonstration, from the Royal Society of Chemistry, a solution of acidified potassium dichromate, which looks like red wine, is poured into beakers with small amounts of colourless solutions in. The colour changes to water, milk, raspberry milkshake and lemonade. The solutions used are barium...

Making Rayon

In this classic demonstration, from the Royal Society of Chemistry, cellulose is dissolved in a solution of tetraaminecopper (II) ions to produce a blue liquid. When the liquid is injected into sulphuric acid, polymer fibres of rayon are produced.

The resource provides a list of apparatus and chemicals...

The Oxidation States of Vanadium

In this classic demonstration, from the Royal Society of Chemistry, zinc is used to reduce a yellow solution of ammonium vandate (V) to a mauve solution of vanadium (II) ions. The intermediate oxidation states of vanadium (IV) and vanadium (III) are also seen as the colours blue and green are observed.

The...

Complexes of Nickel(II) with Ethylenediamine

In this classic demonstration, from the Royal Society of Chemistry, the complexes of nickel are formed by reacting different amounts of nickel (II) chloride with ethylenediamine. When the experiment is complete the nickel complex is returned to its original state by the addition of acid.

The resource...

The Lead-acid Accumulator

In this classic demonstration, from the Royal Society of Chemistry, lead electrodes are placed in a solution of sulphuric acid and connected to a power pack. After charging, the power pack is replaced by a bulb which will light up for a short time.

The resource provides a list of apparatus and chemicals...

Making Polysulphide Rubber

In this classic demonstration, from the Royal Society of Chemistry, sulphur is dissolved in hot sodium hydroxide and the solution is reacted with 1,2-dichloroethane. The condensation polymer polysulphide rubber is formed.

The resource provides a list of apparatus and chemicals needed for the experiment,...

Episode 506: Particles as Waves *suitable for home teaching*

Through demonstrations, discussions and worked examples, students are introduced to the phenomenon of wave-particle duality. Students learn that electrons, which are often thought of as particles, can sometimes behave as waves.

The activities in this learning episode look at:
* demonstrating diffraction...

Episode 117: Kirchhoff’s Laws *suitable for home teaching*

From the Institute of Physics, this learning episode links Kirchhoff’s circuit laws to the conservation of charge and energy. Students can verify the laws experimentally and use them to solve simple circuit problems.

This learning episode involves the following activities:
• demonstrating the...

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