Het opsporen van een stoichiometrische regel uit meetgegevens

Tijdschrift voor Didactiek van de Beta-wetenschappen, uitgegeven door het Freudenthal Instituut, Universiteit Utrecht in de periode 1983-2014

De Jong, O. Hamaker, A. Tijdschrift voor Didactiek van de Beta-wetenschappen 1985 – 3(1), 25-35 Download pdf

The search for stoichiometric rules from data

In chemical education there is a trend to stimulate pupils to find out an empirical rule from a set of empirical data. The development of such a rule can be seen as a process of determination of an empirical relation, followed by generalization of the result. The present research was focused on the extent of the generalization process. Nine small groups of pupils 3 HAVO/VWO had to find out a stoichiometric rule on the base of empirical data, derived from a restricted set of experiments ‘on paper’. Classroom protocols were collected and analysed. Results of the analysis indicate that pupils only use data from the first (two) experiment(s). The other ones were ignored. The conclusion is that the extent of generalization is restricted to a minimum or is missing at all. If pupils have to work with empirical data ‘on paper’, there should be given particular attention to the selection, structure and mode of the offered data.