Today, we did simple experiments to help us understand the concept Diffusion.
First, Mr Foo showed us the experiment that involved the heating of sold iodine, and after sublimation, to iodine vapour . It was really cool as the iodine was purple and the gas was purple. At first, the gas was a dark shade of purple, but after awhile, it faded as it slowly diffused with the air, and hence, turned a lighter shade.
Diffusion
So what is diffusion?
I would define diffusion as the movement particles from an area of higher concentration to that of a lower concentration till it reaches an equilibrium.
Diffusion tells us that matter is made up of small particles which are in constant motion and random direction.
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Next, there was an experiment that showed the relationship between of gas with rate of diffusion. 2 highly corrosive acids were involved: hydrochloric acid and ammonia gas, hence we were not allowed to be in contact with it.
This is a diagram of the experiment (as i did not take a picture :P)
Though it wasn't a very successful experiment.
Next, we conducted a very simple experiment by ourselves.
First, we poured sand and beans respectively into 2 separate test tubes. Later on we mixed them together.
Two separate test tubes
mixture
The initial volume is 50 ml each. Hence, I predicted that there will be 70cm3 of it left. However, there was 90cm3 left instead. This shows that there are spaces between the beans.
The last experiment was mixing ethanol and water. Since they are miscible, the volume decreased after we shook it.
Starring Min and Sneha, and of course, the tube!
Thats all!
