Advertisements
Advertisements
Question
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Advertisements
Solution
Bromine diffuses slowly in air because the motion of bromine particles is obstructed due to the collision with the moving air particles. But bromine diffuses very rapidly in vacuum because in vacuum there is no gas, and the motion of the particles of bromine gas is not obstructed by any other particle. Therefore, the diffusion rate in vacuum is high.
APPEARS IN
RELATED QUESTIONS
Gases have definite volume but no definite shape.
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Explain why steel is used to make railway lines.
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
How would you confirm that a colourless liquid given to your is pure water ?
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Define Foam Give one example.
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
What is the effect of temperature on the solubility of solids in liquids ?
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
Name the process which is used in milk dairies to separate cream from milk.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Liquids cannot be compressed and they have fixed volume.
The physical state of water at 373 K is ______.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
Define the term matter.
