CLEAPSS Latest Supplementary Risk Assessments

The latest Supplementary Risk Assessments from CLEAPSS.

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Latest Supplementary Risk Assessments

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SRA040 - The Raging Raisin and Singing Sultana (26 Nov 2025)

This Supplementary Risk Assessment provides an alternative demonstration to the existing SRA001: The Howling/Screaming Jelly Baby. Note:- These activities are designed to be carried out individually a.. more

SRA012 - The methane rocket (18 Nov 2025)

Risk assessed instructions and control measures for demonstrating this gas-powered rocket.Note:- These activities are designed to be carried out individually as part of a lesson conducted in a seconda.. more

SRA028 – Rainbow flames (27 Mar 2025)

Alcohol is added to a series of beakers or crystallizing dishes containing metal salts and boric acid. The vapour is ignited and coloured flames are observed.Note:- These activities are designed to be.. more

SRA039 - Propanone oxidation with a copper catalyst (14 Oct 2024)

A hot copper plate is placed into an atmosphere containing propanone and the reaction takes place on the surface of the copper foil, making it appear red hot. As the concentration of air in the flask .. more

SRA027 – Dynamite soap (31 Aug 2023)

The explosion between hydrogen and oxygen, in the confines of a modern school laboratory, is extremely loud.A mixture of hydrogen and oxygen is placed inside a syringe. The mixture is bubbled into soa.. more

SRA037 - Investigating the properties of gallium metal (5 Apr 2023)

The low melting point of gallium metal is demonstrated, eg by using warm water to melt a sample or by making it into a spoon shape and showing that it melts when used to stir a cup of tea.Note:- These.. more

SRA035 - The burning pencil demonstration (5 Apr 2023)

A pencil is sharpened at both ends and crocodile clips attached at each end. These are connected to a low voltage power supply. The voltage is increased and the wooden casing quickly starts to produce.. more

SRA017 - The hydrogen peroxide genie (5 Apr 2023)

Instructions, including risk assessed control measures, for safely demonstrating the rapid decomposition of hydrogen peroxide using manganese dioxide. The reaction produces considerable amounts of ste.. more

SRA015 - Preparing and exploding nitrogen triiodide (5 Apr 2023)

Instructions, including control measures, for preparing and demonstrating this interesting explosive substance.Note:- These activities are designed to be carried out individually as part of a lesson c.. more

SRA005 - Cannon fire: sprinkling potassium manganate (VII) onto a burning mixture of hydrogen peroxide and ethanol (5 Apr 2023)

A set of risk assessed instructions for safely demonstrating this reaction. The reaction between the permanganate and peroxide releases oxygen which burns with a harmless, but quite loud, bang.Note:- .. more

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