Anderer Ressourcentyp

Siemens Stiftung

Sound (link list)

Link list:
Many interesting links regarding the topic "Sound".

Information and ideas:
Suitable as a source for internet inquiry for the teacher and students.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Foam fire extinguisher (teacher information)

Teaching methods:
Teaching methods for teachers on the worksheet of the same name

In order to complete the task, the students must have previously learned about the reaction of sodium bicarbonate (baking soda) with citric acid and how to interpret it. The task can be worked through on a purely experimental level or else with prior knowledge of chemistry. The students should definitely have the basic idea that gases formed in a closed container generate pressure.
Degree of difficulty of the task: medium.
The teaching methods provide teachers with all the important information on using the worksheet of the same name and the related incremental hints in class. The scientific background on the task and possible variations are provided.
The five incremental hints for the task are provided with their answers. They are also available as a separate ready-to-print medium named "Foam fire extinguisher (hints)? on the media portal of the Siemens Stiftung.

Anderer Ressourcentyp

Siemens Stiftung

How does "freeze-drying? work? (hints)

Incremental hints:
The six hints and answers for the worksheet of the same name prepared for printing. The last hint presents the complete solution.

Working with incremental hints allows weaker students to develop a solution independently, helping them gain a sense of achievement and experience learning success. The document provides assistance related to the content and learning strategy for solving the task from the worksheet of the same name.

Information and ideas:
The students who did not use the hints to solve the task should also read the last hint with the complete solution to compare their results.
The hints in the prepared tasks have been designed so that they can be printed double-sided. Additional information on how the hints are used is compiled in the teaching methods named "Tasks with incremental hints - An introduction? that are available on the media portal.

Anderer Ressourcentyp

Siemens Stiftung

Foam fire extinguisher (hints)

Incremental hints:
The five hints and answers for the worksheet of the same name prepared for printing. The last hint presents the complete solution.

Working with incremental hints allows weaker students to develop a solution independently, helping them gain a sense of achievement and experience learning success. The document provides assistance related to the content and learning strategy for solving the task from the worksheet of the same name.

Information and ideas:
The students who did not use the hints to solve the task should also read the last hint with the complete solution to compare their results.
The hints in the prepared tasks have been designed so that they can be printed double-sided. Additional information on how the hints are used is compiled in the teaching methods named "Tasks with incremental hints - An introduction? that are available on the media portal.

Arbeitsblatt

Siemens Stiftung

How does "freeze-drying? work? (task)

Worksheet:
The task of finding out how freeze-drying works is presented as a contextual scenario.

A short story leads to the task?s question; a boy named Daniel is preparing for a camping trip, and it is recommended to him that he take along freeze-dried ready-made meals. He thinks this food is so great that he wants to find out how freeze-drying works. The phase diagram of water is provided to the students to help them solve the task.

Incremental hints for answering this task are available under "How does ?freeze-drying? work? (hints)? on the media portal of the Siemens Stiftung.
Explanations of the experiment for the teacher are found in "How does ?freeze-drying? work? (teacher information).?

Anderer Ressourcentyp

Siemens Stiftung

Sound - basics

Guideline:
Display of the parameters of sound and distinction of different sound types.

The most important basics about "Sound" - Definition, sound types, parameters, speed of sound etc - are presented together.

Information and ideas:
Logical structure for looking at the topic. Suitable for active and passive forms of learning.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

What is sound?

Information sheet:
The principle of sound generation and propagation as a wave in the air or in water is explained concisely.

The nature of sound is described based on the bursting of a balloon and an oscillating loudspeaker diaphragm. The comparison with a water wave clarifies the differences in the type of oscillation.

Information and ideas:
The sound generation experiments with oscillating bodies should be conducted beforehand so that the students can better understand the phenomena.

Relevant for teaching:
Acoustic phenomena
Sound/acoustics: properties
Oscillations and waves


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Impulse sound and hearing impairment (link list)

Link list:
Selected links for working on the inquiry task of the same name.

Information and ideas:
Suitable as a source for Internet inquiry for teachers and students alike.

Anderer Ressourcentyp

Siemens Stiftung

How does "freeze-drying? work? (teacher information)

Teaching methods:
Teaching methods for teachers on the worksheet of the same name

The teaching methods specify the learning prerequisites for completing the task on the worksheet. In addition to knowing about the states of aggregation of water and the transitions between the phases (solid - liquid - gas), the students should be familiar with sublimation and resublimation as special cases of phase transition. They should also be acquainted with the representation of the phases on a phase diagram.
The background on the task and possible variations are provided.
The six incremental hints for the task are provided with their answers. They are also available as a separate ready-to-print medium named "How does ?freeze-drying? work? (hints)? on the media portal of the Siemens Stiftung.

Arbeitsblatt

Siemens Stiftung

Foam fire extinguisher (task)

Worksheet:
The task of finding out how a foam fire extinguisher works should follow experience gained in an experiment on how sodium bicarbonate and citric acid react with each other.

The design of the fire extinguisher should build upon experiments previously conducted by the students. The students should draw a sketch and explain the function.
Incremental hints for answering this task are available under "Foam fire extinguisher (hints)? on the media portal of the Siemens Stiftung.
Explanations of the experiment for the teacher are found in "Foam fire extinguisher (teacher information).?