Advertisements
Advertisements
प्रश्न
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Advertisements
उत्तर
The particles, 'X' are pollen grains.
- The fluid, 'Y' is Water.
- The zigzag movement of 'X' is called Brownian motion.
- The zigzag motion of the pollen grains occurs because the particles of water are in constant motion. These particles collide with the pollen grains and cause them to move.
- Robert Brown is the scientist who discovered Brownian motion.
- Liquid Y is made up of extremely small particles, which are moving constantly.
APPEARS IN
संबंधित प्रश्न
The inter-molecular space is maximum in
Liquids have definite volume but do not have definite shape.
Give one difference between atoms and molecules.
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
The property/properties which enable copper metal to be used for making electric wires is/are :
State whether the following statement is true or false :
Bread is an example of solid foam.
Explain what happens when a beam of light is passed through a colloidal solution.
Which one of the following is not a chemical change ?
One of the following liquids will leave behind a residue on heating. This one is :
Name the process by which the various gases of the air are separated.
Name the process which can be used to recover salt from an aqueous salt solution.
What difference in the properties of oil and water enable their separation by a separating funnel ?
Describe a method to separate a mixture of common salt and sand.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
A teabag placed in a cup of hot water will diffuse into the water.
Solids do not flow.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Examples of foam are ______.
