Macroscopic modelling of physical and chemical changes at the compulsory secondary education. A constant dialog between observation, interpretation, experiments and arguments
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In this article we present a sequence of activities that have the objective of learning to differentiate physical changes from chemical changes and to identify the substances that react and are formed in chemical reactions. It is also intended to observe a series of characteristics of chemical reactions and to initiate a process of classification. The changes that are investigated are sequenced on the base of the changes that are carried out without any external action, those which are produced when substances are heated or an electrical current pass through them and, lastly, when we put in contact two substances. Each activity is carried out through a process of investigation and modelling in seven stages.
keywords: Physical and chemical changes, chemical reaction, modeling, inquiry.
keywords: Physical and chemical changes, chemical reaction, modeling, inquiry.
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Caamaño, Aureli; and Corominas, Josep. “Macroscopic modelling of physical and chemical changes at the compulsory secondary education. A constant dialog between observation, interpretation, experiments and arguments”. Educació química, no. 27, pp. 19-26, https://raco.cat/index.php/EduQ/article/view/383750.
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