Diffusion
What is diffusion?
It’s the process by which particles move freely to fill any available space.
OR
It’s the movement of particles from a region of higher concentration to a region of lower concentration down the concentration gradient.
(It’s better if you learn the second one since you will need that in biology too, when we do diffusion and osmosis)
They usually ask this question that there are two gas jars separated by a thin cover. One contains air, the other has bromine gas. The cover is removed, what do you observe?
Here you should keep in mind that bromine gas is of reddish-brown colour and air is colourless. Now they are ONLY asking what do you SEE. DON’T WRITE ABOUT DIFFUSION HERE. Just say that, a light brown colour is spread thoughout the gas jars. Then they may ask. How or why. Then talk about diffusion. And tell the chemistry behind it. That Both air and bromine are made up of particles moving at random, and bromine is a reddish brown gas, the bromine particles are concentrated in one jar so they diffusing out to the other jar, from a region of higher concentration to that of lower concentration. And a homogeneous mixture of air and bromine is formed.
Homogenous mixture? When there are equal particles of both gases in each jar.
It’s the process by which particles move freely to fill any available space.
OR
It’s the movement of particles from a region of higher concentration to a region of lower concentration down the concentration gradient.
(It’s better if you learn the second one since you will need that in biology too, when we do diffusion and osmosis)
They usually ask this question that there are two gas jars separated by a thin cover. One contains air, the other has bromine gas. The cover is removed, what do you observe?
Here you should keep in mind that bromine gas is of reddish-brown colour and air is colourless. Now they are ONLY asking what do you SEE. DON’T WRITE ABOUT DIFFUSION HERE. Just say that, a light brown colour is spread thoughout the gas jars. Then they may ask. How or why. Then talk about diffusion. And tell the chemistry behind it. That Both air and bromine are made up of particles moving at random, and bromine is a reddish brown gas, the bromine particles are concentrated in one jar so they diffusing out to the other jar, from a region of higher concentration to that of lower concentration. And a homogeneous mixture of air and bromine is formed.
Homogenous mixture? When there are equal particles of both gases in each jar.
Gas particles of
different sizes diffuse at a different rate.
Which means, H2 will diffuse quicker than O2 since the size of its particles are smaller in size.
Which means, H2 will diffuse quicker than O2 since the size of its particles are smaller in size.
Also gas particles
of a greater mass take longer to diffuse.
Which means that the greater the molecular mass of a gas, the more time it will take to diffuse.
Which means that the greater the molecular mass of a gas, the more time it will take to diffuse.
Normally, they give you a stoppered horizontal tube, with two cotton
balls at each ends, soaked in different solutions and you have to figure out
which will diffuse faster. So what you have to do is calculate their Mr The
one with greater Molecular mass will diffuse slower.
Or they can show the same apparatus with fumes on one side of the tube. If they are on the right it means the solution on the right diffused slowly.
Or they can show the same apparatus with fumes on one side of the tube. If they are on the right it means the solution on the right diffused slowly.
Remember: 1. Diffusion in gases is faster, than
diffusion in water. Why? Because the
particles of gas are in a much rapid motion.
2. Temperature affects diffusion. The greater the temp, the greater the diffusion.
2. Temperature affects diffusion. The greater the temp, the greater the diffusion.
KEEP VISITING THE BLOG FOR FURTHER HELP :)
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