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The Properties of Gases
Carbon dioxide
Physical Properties
...
|
Colour |
Colourless |
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Odour |
Odourless |
|
Density compared to air (heavier or
lighter) |
Heavier than air |
Chemical Properties
...
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Solubility in water |
Fairly
soluble in water. It reacts with water to form a weak acid
called carbonic acid. |
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Burning |
Does not support combustion. |
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Moist pH paper |
Shows a weak acidic reaction (around
pH6) |
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Red rose petals |
No change |
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Specific test |
Turns lime water "cloudy" |
Footnotes:
- Makes up 0,04% of
the gases in the air. Rainwater is slightly acidic because
carbon dioxide dissolves in it.
- Needed by green
plants during photosynthesis.
- Product of
respiration in living things.
- Product of
combustion
- Is one of the
"greenhouse" gases present in the atmosphere.
- Used in fire
extinguishers since it is heavier than air and forms a
"blanket" around the fire. This prevents combustion since
carbon dioxide does not support it and the presence of carbon
dioxide stops oxygen reaching the combustible material.
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