glass
cover
drops of bromine
A few drops of bromine are placed in a gas jar, covered and left for a few
hours. Brown bromine vapour is seen to spread themselves out to fill the gas
jar.
(a) Explain what has brought about this result.
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Answer:
A gas jar containing air is placed upside down on a gas jar containing bromine vapours. It is observed after sometime, the gas jar containing air also becomes completely reddish brown.
Reason:
1. We observe that after some time, the red brown vapours of bromine spread out into upper gas jar containing air.
2. This mixing is due to Diffusion of Bromine vapour into air. Air from upper jar also diffuses into lower jar though we cannot see it. So, diffusion is the process in which mixing of substances with another substance takes place due to motion of particles.
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