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The Properties of Gases Hydrogen gas
Physical Properties
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| Colour |
Colourless |
| Odour |
Odourless |
| Density compared to air (heavier or lighter) |
Lighter than air. Can escape through the atmosphere into space. |
Chemical Properties
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| Solubility in water |
Insoluble |
| Burning |
Explodes when a burning match is placed into it. Reacts with oxygen gas to form water. |
| Moist pH paper |
No reaction |
| Red rose petals |
No reaction |
| Specific test |
A lighted match will produce a "squeak" sound. This is a small explosion. |
Footnotes:
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The lightest gas known.
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Once used in airships but replaced by helium which is not explosive.
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Used to make ammonia which is needed in the manufacture of fertilizers and explosives.
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