This Unilever Laboratory Experiment, published in 1970, describes the procedure for a titration with EDTA and Eriochrome Black T to determine the total hardness of water. The details cover the preparation of a standard solution of EDTA as well as the steps of the titration.

As the number of cells in a microbial culture increases, turbidity increases. In this experiment students calculate doubling time and growth rate constant using absorbance as the measure of growth. Turbidity is caused by suspended cells in the growth medium scattering light, and may be measured using a colorimeter...

This experiment is a continuation of Determining Doubling Time. Students create a standard curve of absorbance against yeast concentration, and use this to determine the concentration of yeast produced over time.

The standard curve (dry mass, grams per litre) is generated from known concentrations of dried...

This mystery deals with a laboratory report in which the written results suddenly vanished. The students need to find out how the writing vanished,  how to recover the vanished data, and what the secret of the pen is.

Curriculum links include ...

This Salters’ Chemistry Course unit from the University of York Science Education Group covered:
* The provision of a safe water supply
* The production of different kinds of drink

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In this investigation, students extract iron from a breakfast cereal and consider how our bodies are able to digest iron by looking at its reactions with hydrochloric acid.

The work suggested in this Nuffield Working with Science unit encourages the students to start thinking about efficiency by presenting them with some problems which are a familiar part of their daily lives. They are asked to investigate problems which have been chosen...

A Year Ten module from the Salters double award science course. Models are used to illustrate conservation of current in a series circuit leading to studies of voltage, current and resistance and the resistance law. Devices which have different resistance in response to...

Produced by the Hamilton Trust, this resource aimed at Year Six gives details of six lessons on balanced forces. Children learn about gravity, air resistance, friction and upthrust of liquids. Working scientifically they investigate what happens when an elastic band stretches under force and develop an...

From Solar Spark, this practical activity explores the reactions at electrodes in an electrical circuit. A solar cell contains two electrodes. Different reactions happen at each electrode so that electrons can move around the circuit to give an electric current. In this experiment students use filter paper soaked...

This Nuffield Working with Science unit aimed to enable students to design circuits to meet specific needs. The plan was also to help students to realise the range of electronics problems which they can solve by taking a systems approach.

This activity sheet is based on the Inventive Podcast.  It introduces a disaster risk engineer Josh Macabuag, and links his work to a physics topic. The activity sheet also supports Careers Benchmark 4: Careers in the curriculum by introducing a career and role model. There are also links to short audio clips of...

A Year Ten module from the Salters’ double award science course. The module begins by looking at the large variety of labour-saving devices now available and their impact on life-styles. Students work with a range of common electrical devices to investigate the relative...

This multimedia package was developed by the Gatsby Science Enhancement Programme to provide teachers with clear and consistent ways of talking about energy. Energy is a particularly difficult concept to explain. These resources aim to cut through the confusion that often surrounds the energy concept, and examines...