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Hydrogels - Water-Absorbing Polymers

A Catalyst article about hydrogels. Soft contact lenses, disposable nappies, hair gel and plant water crystals all make use of substances called hydrogels. These are polymers which have the unusual property of being able to absorb huge quantities of water. The article looks at the structure of hydrogels and their...

Measuring Surface Tension

A Catalyst article about experiments on surface tension based on a simple test that can be conducted at home or in a school classroom.

This article is from Catalyst: Secondary Science Review 2007, Volume 18, Issue 2.

Catalyst is a science...

Try This - Make Your Own Cloud

In this Catalyst article an experiment is described in which the formation of clouds can be replicated. The experiment requires nothing more than a plastic bottle, warm water, matches and a small thermometer.

This article is from Catalyst: Secondary Science Review 2011, Volume 21, Issue 4...

Try This - Make Your Own Spectrometer

A Catalyst article describing how to make a spectrometer to analyse light by using a CD to split the light and some other household items for the rest of the equipment.

This article is from Catalyst: Secondary Science Review 2011, Volume 21, Issue 4.

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Predator and Prey - Try This

A Catalyst article about experimenting with waterboatmen and observing how they catch their prey. The equipment required for the activity is described.

This article is from Catalyst: GCSE Science Review 2006, Volume 16, Issue 4.

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