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Bubbles that float and sink

Description

In this demonstration you can observe carbon dioxide filled bubbles and hydrogen or methane filled bubbles. It touches on a number of areas of chemistry such as density, diffusion and the solubility of gases.

Type of Activity

:
demonstration

Audience

:
Teacher

Age Group

:
11 to 16 years

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
bubbles-that-float-and-si...



Apparatus Chemicals

The teacher will require:

Eye protection for demonstrator

Conical flask (1 dm3)

Two-holed rubber stopper, to fit flask

Plastic funnel, small - about 3 cm diameter

Beaker (100 cm3)

Expanded polystyrene container, such a cool box (for storing dry ice) (Note 1)

Insulating gloves (for handling dry ice)

Length of right-angled glass tubing (Fig. 2)

Length of plastic tubing or rubber tubing, about 50 cm

Dropping pipette teat, to fit glass tubing

Boss, clamp and retort stand, as required.

The quantities are given for one demonstration:

Candle or wax taper – taped to a stick about 1 m long

Solid carbon dioxide (Dry Ice), about 100 g
 (Note 1)

Washing-up liquid, a few cm3

Propane-1,2,3-triol (glycerol), a few cm3

Source of hydrogen (EXTREMELY FLAMMABLE) and/or methane (Natural Gas) (EXTREMELY FLAMMABLE) (Note 2)

Refer to Health & Safety and Technical notes section below for additional information.

 


Read our standard health & safety guidance

Generating, collecting and testing gases)

Generating, collecting and testing gases)




 




In this demonstration you can observe carbon dioxide filled bubbles and hydrogen or methane filled bubbles. It touches on a number of areas of chemistry such as density, diffusion and the solubility of gases.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.