Dein Suchergebnis zum Thema: have/"<b

Evaporation is vital for plants. Its leaves are covered on all surfaces by epidermal cells, which are protected by a layer of wax (cuticle) on the outside, making it hard for water vapor (as well as for oxygen and CO2) to permeate the surfaces. Gas is exchanged with the environment through stomata. These stomata consist of two bean-shaped guard cells, which regulate the gas exchange of the leaf and thus can also control the evaporation rate in the range of two orders of magnitude. Information and ideas: The microscopic photo originates from an electron microscope.
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The teaching methods specify the learning prerequisites for completing the task on the worksheet. The students should already know that plants release most of the water that they absorb through their roots through evaporation via their leaves. The scientific background on the task and possible variations are provided. The six incremental hints for the task are provided with the corresponding answers. They are also available as a separate ready-to-print medium named “Not all shade is the same (hints for printing)” or as an interactive medium named “Not all shade is the same (interactive hints)” on the media portal of the Siemens Stiftung.
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Students learn how many kilowatt-hours of electrical energy and heat are used in an average four-person household in Germany. Typical values are provided, for example, the energy consumption of a hair dryer or the heating value of one cubic meter of gas. In addition, the energy yields of photovoltaic, solar thermal, and geothermal systems are explained in more detail and specific values are given. Using the following sources: Wikipedia; www.musterhaushalt.de; www.einfamilienhaus.org; www.solaranlagen-portal.com; www.paradigma.de; “Thermische Solaranlagen für Warmwasser und Heizung,” Fraunhofer ISE Stefan Hess (2012); “Checkliste Wärmepumpen 2012/13,” Verbraucherzentrale Energieberatung;
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A short story leads to the task’s question. The students should think of an experiment with which they can separate three types of plastic with different densities as easily as possible. Incremental hints for answering this task are available under “Separating plastic waste (hints for printing)” or “Separating plastic waste (interactive hints)” on the media portal of the Siemens Stiftung. The worksheet includes QR codes for using the interactive hints online and viewing the solution. Explanations of the experiment for the teacher are found in “Separating plastic waste (teacher information).”
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The two magnetic separation procedures are used, for example, to sort residual waste. The text provides information about the kinds of materials the respective procedure is suitable for and the physical principle each procedure is based on. Sample applications of these principles that the students are familiar with from class are mentioned. The way the two procedures work is explained and technical implementation for separating residual waste is outlined. Information and ideas: The example of sorting residual waste also works well for learning about other physical separation procedures, such as sifting (separation by grain size) and wind sifting (separation by density).
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The students will measure the pH value of water as well as of water with citric acid and water with washing soda. They will learn the terms alkali and acid. The instructions first include a photo and a list of the required apparatus and materials. Text and pictures explain the preparations for the experiment step by step. Then several assignments are presented: The students should express their guesses, conduct the experiment, and note down their observations. Information and ideas: • Observe the safety information in these instructions as well as in the teacher information related to the experiment and discuss them with your students. • Also observe the applicable safety guidelines for your school.
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Evaporation is one element in the water cycle. Evaporation causes vapor to rise to higher, cooler layers of air, where it forms clouds of small water droplets or ice crystals and then falls to the surface again. Information and ideas: Other animations on evaporation can be found under this term. Students should enter the stations of the principle of ecaporation. The worksheet can be used during in the work phase and in the repetition phase to record the results.
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Chemical energy is present both in the bond between atoms and molecules as well as in the potential for chemical bonding. This energy can be released in the form of heat during the bonding process or when those bonds are broken. This “heat of reaction is also referred to as reaction enthalpy (H). The release of heat (dH 0). Every mixture of source materials that can react to produce end products can be regarded as a potential source of chemical energy. Microscopically speaking, this chemical energy can be found in the bonds between individual atoms, as illustrated in the potential curve. Information and ideas: Chemical energy is a form of energy that is easy to store – whether in the human body or in batteries. An additional example is hydrogen as a chemical energy store for renewable energy sources.
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The teaching methods provide teachers with all the important information on using the “Separating plastic waste” worksheet and the related incremental hints in class: The learning prerequisites required of the students are: The students must be familiar with the property of density as well as with the fact that materials with lower densities than water float and materials with higher densities sink. The scientific background on the task and a possible variation are provided. The six incremental hints for the task are provided with the corresponding answers. They are also available as a separate ready-to-print medium named “Separating plastic waste (hints for printing)” or as an interactive medium named “Separating plastic waste (interactive hints)” on the media portal of the Siemens Stiftung.
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In order for energy to be available whenever it is needed, the energy is stored. This medium shows the most important energy stores for thermal, mechanical, chemical and electric energy. They are extremely important, particularly with a view to using renewable energy sources. Storing energy usually requires conversion processes, since not all forms of energy are equally suitable for storage. This module provides an overview of the efficiency of storage. Information and ideas: In-depth information on energy stores can also be found in the “Renewable energy sources guideline. The media “Stores for electrical energy and “How batteries and accumulators work are also available specifically for electric energy stores. These are provided as individual media on the media portal of the Siemens Stiftung.
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