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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.
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)? on the media portal of the Siemens Stiftung.
Explanations of the experiment for the teacher are found in "Does combustion make things heavier or lighter? (teacher information).?
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.
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.