Advertisements
Advertisements
Question
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?
Advertisements
Solution
The particles of potassium permanganate and water mix on their own without any stirring. Two conclusions can be drawn from this phenomenon. These are:
- Potassium permanganate and water are made up of very tiny particles.
- Water particles have large spaces between them which are occupied by the tiny potassium permanganate particles.
APPEARS IN
RELATED QUESTIONS
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
Name a metal which is soft and a non-metal which is hard.
Which type of elements, metals or non-metals, show the property of brittleness ?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
The element which is not common between the compounds called baking soda and soda ash is
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
What is the difference between solutions and colloids ?
Which of the following represents the solubility of sugar in water at 20°C ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Write a method to separate a mixture of sand and potash alum.
Describe a method to separate a mixture of camphor and sand.
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Explain how, nitrogen , oxygen and argon gases are separated from air.
Explain the meaning of the term ‘matter’.
Define the term matter.
Define the term matter.
Define the term matter.
