Experiment

Siemens Stiftung

A3 Lemon batteries and other batteries (teacher instructions)

Experimentation instructions for Experimento - 10+:
Background information on the content and practical information on conducting the experiment "Lemon batteries and other batteries - Electricity from chemical energy". This experiment comprises six subexperiments.


The sequence of the subexperiments forms a learning unit that builds upon itself - from the first qualitative investigation of the "electrochemical cell" phenomenon based on simple fruit and vege-table batteries, to the explanation based on the electrochemical series of metals, to the building of powerful accumulators and batteries. This unit can be used both to develop the subject of electro-chemistry and to put knowledge learned about redox chemistry into practice. Of course, the subexperiments can also be conducted individually. Teachers may freely choose the degree of emphasis for each topic. The materials and apparatus supplied allow eight groups of students to conduct the experiments simultaneously.

The experiment comprises six subexperiments:
· How well does the "fruit and vegetable battery" work?
· The "lemon battery": What role does each element play?
· The "lemon battery" without the lemon
· Boosting battery performance
· Spontaneous copper plating?
· A professional zinc-copper battery

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school.
· All materials mentioned in the instructions will have to be purchased directly from commercial sources.

Anderer Ressourcentyp

Siemens Stiftung

Does combustion make things heavier or lighter? (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.

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.

Bild

Siemens Stiftung

Detection reaction for unsaturated fats (4)

Photo:
Addition of soluble starch to olive oil (on the left). The starch serves as an indicator of "free iodine? through the formation of a blue iodine/starch complex.

Note: The test tube must be shaken before the detection result can be evaluated.

Arbeitsblatt

Siemens Stiftung

A3 Lemon battery - Apparatus and materials (worksheet 6)

Worksheet for subject teaching in English:
For the student experimentation instructions of the same name. Methodology tool: wordlist developed by Josef Leisen and Heinz Klippert.


Note: This worksheet has been developed especially for subject teaching in English and for language-sensitive subject teaching. It uses the word list methodology tool developed by Josef Leisen and Heinz Klippert. The wordlist helps during the introduction of new terms and is used to look up, review, and practice terms.
Students whose native language is not English and who do not have strong English skills receive support and training in understanding the technical vocabulary. They work with the specialized vocabulary and in this way acquire the ability to communicate about specific subjects.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

A3 How well does the "fruit and vegetable battery? work? (worksheet 3 answer sheet)

Answer sheet:
For the worksheet of the same name for subject teaching in English.

You can find more detailed information on the associated worksheet for subject teaching in English "A3 How well does the "fruit and vegetable battery? work? (worksheet 3),? which is available on the media portal of the Siemens Stiftung.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

A3 The "lemon battery? without the lemon (worksheet 4 answer sheet)

Answer sheet:
For the worksheet of the same name for subject teaching in English.

You can find more detailed information on the associated worksheet for subject teaching in English "A3 The "lemon battery? without the lemon (worksheet 4),? which is available on the media portal of the Siemens Stiftung.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

C3 How does human digestion break down fats? (link list)

Link list:
Further information on the experiment "C3 How does human digestion break down fats? - Saponification of edible oil".

The links can be used for preparing or for further study of experiments from Experimento - 10+.

Anderer Ressourcentyp

Siemens Stiftung

A3 Lemon batteries and other batteries (student instructions)

Experimentation instructions for Experimento - 10+:
Detailed instructions and questions for students on conducting the experiment "Lemon batteries and other batteries - Electricity from chemical energy". This experiment comprises six subexperiments.


The experiment comprises six subexperiments:
· How well does the "fruit and vegetable battery" work?
· The "lemon battery": What role does each element play?
· The "lemon battery" without the lemon
· Boosting battery performance
· Spontaneous copper plating?
· A professional zinc-copper battery

For each subexperiment, the students are first provided with an overview of the materials to be used and safety information. This overview is followed by the detailed, step-by-step instructions for conducting the experiment. Afterwards, the students are asked to note their observations. Specific questions are used to guide the students as they analyze the results of the experiments. At the end, the students are asked probing questions related to the experiment (an answer sheet is available for teachers).

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school and discuss it with your students.
· This student instruction is also available in Word format (doc-file).

Anderer Ressourcentyp

Siemens Stiftung

Does combustion make things heavier or lighter? (teacher information)

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

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 task is about recognizing the principle of the conservation of mass in chemical reactions. The 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 "Does combustion make things heavier or lighter? (hints)? on the media portal of the Siemens Stiftung.