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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...

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.

Catalyst ...

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