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

ISSN 16996712

Número 22. Juny 2012

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

Educational experiences and practical works

  • Candies, sugar, respiration and reaction rate
    Basili Martínez

    • In this practical work we present a reaction to study qualitatively the factors that determine the speed of a chemical reaction. This reaction is made with common products of the school laboratory (sugar and permanganate) and also incorporates the candies to approach chemistry to the student’s everyday thinking. Permanganate is used as a limiting reactant. The reaction ends when a color change is detected. Measuring how long it takes to change the initial color, we estimate the speed of the reaction. Using this time we evaluate the different factors that influence in the speed of it.

    • Keywords: candies, sugar, permanganate, redox reaction, reaction rate

  • Electromagnetic induction
    Lluís Nadal i Balandras

    • We propose several experiments to show how mechanical energy can be transformed into electrical energy and electrical into mechanical. We also study the factors involved in the transformations.

    • Keywords: magnetic induction, magnetic field, magnetic flux, force lines, mechanical energy, electrical energy, Faraday law, generation of electricity

  • How does a candle works?
    Joan Aliberas

    • One tool that looks trivial can become a good resource to learn to think in chemical terms. A set of simple experiments performed with a lit candle, and other combustions, help students to build a chemical explanation of what is happening.

    • Keywords: candle, combustion, flame, elements, chemical change, energy

  • Digitization process of a Physics contextualized project for high school
    Luisa Herreras and Josep Olivella

    • Physics in Context is a project that proposes a new methodology for teaching high school physics-based contexts. This article is a review of how this project has evolved until the current digital format, how it is currently being implemented and which are some of the difficulties of the staff that applies this project.

    • Keywords: physics, high school context, digital, group work

Reflections and researches on science education

  • The rubric, the assessment instrument for basic skills
    M. Carmen Díez Calzada and Sílvia Zurita i Món

    • Rubrics are a powerful tool to contribute to the involvement and motivation of students to take an active role in their own learning process. The rubric contains three components: rating scales, aspects to evaluate and criteria or descriptors.
      Rubrics can be designed for reflective self-assessment of students in their own learning process, and for co-assessment with the teacher guiding the students. From this perspective it fulfills the premise of including a component of assessment during the process of teaching-learning and it provides information on the degree of achievement of basic skills.
      Rubric is presented as an excellent solution to organize criteria, areas and degree of learning. The authors make a proposal of descriptors for different degrees of competency, that are observable in the scientific technological laboratory, in solving problems and in making portfolios. It is useful in all subjects.

    • Keywords: rubric, assessment, scientific-technological core competencies

Deeping in the science

  • Taking advantage of every bit of heat: the Green Tube in Mataró
    Llorenç Alerm

    • The residual heat emitted by several environmental infrastructures can be used to distribute heat and cold in their urban environment. It is an energy source that reduces pollution, CO2 emissions and fuel imports. This is a strategy that has been used for years in several countries: the approach has been widespread in central and northern Europe, and has arrived here more recently, with initiatives like the Green Tube in Mataró.

    • Keywords: waste heat, cold and heat networks, district heating & cooling

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