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Physical Materials Properties – workshop I

Phases

1. Dividing the students into groups

2. Activity introduction

3. Group work

4. Product presentation

Objective:

Identify different textile fibres based on their chemical reaction

Test duration:

4 h

Materials:

•squeeze bottle

•water

•H₂SO₄

•Different fibres: wool, silk, cotton, synthetics

•Schweitzer’s reagent

•HNO3

•NaOH 10%

•Bunsen

CONCLUSIONS

It is possible to identify different kinds of fibres based on their reactions with heat, acids and other substances. Each reaction is based on the fibre chemical composition.

Czech republic

(Gymnázium, Česká 64 –České Budějovice)