Does combustion make things heavier or lighter? (task)
Text
Worksheet:
This document describes an experiment on the conservation of mass in chemical reactions. The task is to explain the sequence and purpose of the experiment.
English, Spanish (CREA), German
2018-03-14
This medium is made available under a CC BY-SA 4.0 international license.
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A candle becomes lighter when it is burned, and steel wool becomes heavier. With this background information, the setup of an experiment is described to the students; matches are burned in a test tube sealed with a balloon. The task is then to describe the purpose of the experiment and the sequence step by step.
Incremental hints for answering this task are available under “Does combustion make things heavier or lighter? (hints for printing)” or “Does combustion make things heavier or lighter? (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 “Does combustion make things heavier or lighter? (teacher information).”
Incremental hints for answering this task are available under “Does combustion make things heavier or lighter? (hints for printing)” or “Does combustion make things heavier or lighter? (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 “Does combustion make things heavier or lighter? (teacher information).”
Worksheet (printable)
Chemistry
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school
Chemical reaction; Combustion process
Siemens Stiftung Media Portal
Dr. Lutz Stäudel and MediaHouse GmbH
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