ciències

Revista del Professorat de Ciències d'Infantil, Primària i Secundària

ISSN 16996712

Número 21. Març 2011

Anima't a escriure les teves experiències, seran benvingudes!

Educational experiences and practical works

  • Construction of a Descartes’ devil
    Lluís Nadal

    • We present several simple ways to build a Descartes’ devil using everyday materials.

    • Keywords: imp of Descartes, buoyancy, Archimedes' principle, Pascal's principle

  • Changing toys colors:discovering their chemistry
    Rosa M. Melià, Josep a. Melià and M. del Tura Puigvert

    • Professors like Dr. Josep Estalella and popularisers like Tom Titt have helped to reintroduce into the classrooms the use of toys use of toys, magic tricks, curiosities, and spectacular productions and landlords. They have used their playful side and his daily life and context to illustrate scientific concepts and laws without losing rigor. Among the toys that are are displayed, we analyse chemical changes using several dolls manufactured in a way that we can easily observe the changes of colour of some of its parts. We will see that these changes can be classified into several groups: indicators of pH and colour change depending on the acidity and thermochromic substance and colour change to relatively high temperatures. We also explain that some souvenirs and small figures are based on the different colours of the hydrate and the anhydrous form of some ionic substances according to the presence of water in the ambience.

    • Keywords: toys, colour changes, chemicals, acid-base, thermochromic, hydrate

  • Seizing the light:The visible and invisible one!
    Narcís Puigdevall and Naroa de la Fuente

    • This article proposes a teaching sequence in order to work with electromagnetic waves in ESO classroom. The general idea is to start analysing the visible light to develop increasingly complex models but with more explanatory power from light particles to electromagnetic waves. Then you can work the rest of the electromagnetic spectrum, discovering what are the applications of invisible light, paying attention to both their utility as potential hazards associated with each region of the spectrum.

    • Keywords: light, waves, photons, electromagnetic waves, danger, learning cycle

Reflections and researches on science education

  • Towards a practical projectoriented modeling
    Neus Garriga, Teresa Pigrau and Neus Sanmartí

    • Many of the projects that apply science in kindergarten and primary classrooms have the shaft deepening in some scientific topics. In this article we analyse how projects have evolved by an author, so that the work is oriented to promote modelling processes of scientific knowledge in children.

    • Keywords: project, modelling, conversation, skills

Deeping in the science

  • The dependence on fossil energyand our energy future
    Mario Giampietro

    • Fossil energy consumption is the basis of the functioning of our society. However, many scientists are sceptical about the possibility of keeping this lifestyle in a context that necessarily has to drastically reduce the current rate of consumption of fossil energy. In the nearest future it seems, we will have to change the power supply, transport, production of goods and the way people live.

    • Keywords: energy consumption, energy alternatives, efficiency, Jevons Paradox

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