Foam fire extinguisher (teacher information) © Siemens Stiftung 2017 CC BY-SA 4.0 international

Foam fire extinguisher (teacher information)


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

English, Spanish (CREA), German
PDF (142.8 kByte) DOC (212.0 kByte)
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 the corresponding answers. They are also available as a separate ready-to-print medium named “Foam fire extinguisher (hints for printing)” or as an interactive medium named “Foam fire extinguisher (interactive hints)” on the media portal of the Siemens Stiftung.
Teaching ideas; Teaching methods
Chemistry; Physics
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school
Chemical reaction; Gas; Pressure (physics)
Siemens Stiftung Media Portal
Dr. Lutz Stäudel (text), Dieter Arnold (photo) and MediaHouse GmbH
© Siemens Stiftung 2017
Stay up-to-date!

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

Media Portal newsletter – register now

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

*Required fields


Liebe Nutzerin, lieber Nutzer,
El Portal de Medios – das spanische Medienportal – ist umgezogen und heißt nun CREA.
Auf CREA finden Sie weiterhin hochwertige Medien für den MINT-Unterricht und vieles mehr.

Dear User,
El Portal de Medios - the Spanish Media Portal - has moved and is now called CREA.
On CREA, you will continue to find high-quality media for STEM education and much more.

Estimado usuario, estimada usuaria,
El Portal de Medios – en español – ha sido trasladado y ahora se llama CREA.
En CREA seguirá encontrando medios de alta calidad para la enseñanza de STEM, y mucho más.

Zu CREA wechseln / Switch to CREA / Cambiar a CREA
CREA - El Portal de Medios para la Enseñanza STEM

Hierbleiben / Stay here / Quédate aquí:
Fenster schließen / Close window / Cerrar ventana