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Making an Emulsion

This Unilever Laboratory Experiment, published in 1966, demonstrates that mineral oil and water form an oil-in-water emulsion when sodium oleate is the emulsifier, and a water-in-oil emulsion when calcium oleate is the emulsifier. Water-soluble and oil-soluble dyes are used to distinguish the two types of emulsion...

Supercontraction of Hair

This Unilever Laboratory Experiment, published in 1967, describes an experiment to measure the contraction of hair in a hot solution of phenol. The procedure is based on a school-made apparatus to measure the changes of length. The results are discussed in terms of hydrogen bonding and disulphide bonds between...

The Rusting of Steel

This Unilever Laboratory Experiment, published in 1969, gives the procedure for using corrosion (ferroxyl) indicator to demonstrate anodic and cathodic areas on the surface of steel as it corrodes.

N-terminal Analysis of a Dipeptide

This Unilever Laboratory Experiment, published in 1967, describes a procedure based on the use of 1 -fluoro 2,4 dinitrophenylation (FDNB) as developed by Sanger during his studies on the structure of the protein hormone insulin. In the experiment, two dipeptides are used which contain the same two amino acids but...

Thin Layer Chromatography

This Unilever Laboratory Experiment, published in 1970, describes the analysis of fluorescers from soap and soapless detergent powders. The procedure describes how the fluorescers can be extracted from the product, separated by thin layer chromatography techniques, and made visible by exposing the chromatograms to...

Determination of Vitamin C in Foodstuffs

This Unilever Laboratory Experiment, published in 1973, describes two methods for determining the vitamin C in foods. The leaflet describes the estimation of vitamin C (L-ascorbic acid) in foodstuffs, after extraction with metaphosphoric acid, by titration with a standardized dye, 2,6 dichlorophenolindophenol,...

Looking at Chemical Reactions

Written by F.C. Brown and published by the English Universities Press, this book contains guidance on how to carry out a number of laboratory experiments to investigate rates of reaction and energy changes. Students, in carrying out these experiments and in attempting to answer the questions that are to be found...

Investigating Metals

Written by F.C. Brown and published by the English Universities Press, this book takes a close look at some of the properties and uses of metals and invites students to try interesting experiments and to make useful devices based on metals. The text includes questions and problems that students are asked to...

Energy (Book 3) and Light (Book 4)

Books 3 and 4 in the Introducing Science series provide a range of practical activities for students to investigate energy and light. The activities are intended to stimulate further investigation and discussion and are accompanied by useful illustrations. The resources also encourage children to do further...

Change (Book 5) and Heat (Book 6)

Books 5 and 6 in the Introducing Science series provide a range of practical activities for students to investigate change and heat. The activities are intended to stimulate further investigation and discussion and are accompanied by useful illustrations. The resources...

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