Advertisements
Advertisements
Question
Define Foam Give one example.
Advertisements
Solution
Foam- A foam is a colloid in which a gas is dispersed in a liquid medium. Examples are soap bubbles and shaving cream.
APPEARS IN
RELATED QUESTIONS
The smallest unit of matter that exists freely in nature is called ...........
The molecules can move freely anywhere in
Liquids have definite volume but do not have definite shape.
Differentiate between an atom and a molecule.
What are the characteristics of matter?
Name a non-metal which is a good conductor of electricity.
State any two properties for believing that aluminium is a metal.
Choose the correct answer.
A 5 per cent sugar solution means that :
Define solubility of a substance. How does it vary with temperature ?
One of the following liquids will leave behind a residue on heating. This one is :
Name the process which is used in milk dairies to separate cream from milk.
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Write a method to separate a mixture of sand and potash alum.
How will you separate a mixture of iron filings and powdered carbon ?
How is scrap iron separated from a heap of waste materials in factories?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Which of the following cannot be separated from air by the process of fractional distillation ?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
