Advertisements
Advertisements
Questions
Define the emulsion. Give one example.
Define emulsion and give an example.
Advertisements
Solution
An emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it. Examples are milk and butter.
APPEARS IN
RELATED QUESTIONS
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
What are the characteristics of matter?
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name one solid, one liquid and one gaseous non-metal.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Define solute.
What will happen if a saturated solution is :
- heated
- cooled
Name the process by which all the dye can be recovered from black ink.
How would you separate iodine from a mixture of iodine and common salt ?
Explain how, impure copper sulphate can be purified by crystallisation.
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
Explain the meaning of the term matter with special reference to the term ‘substance’.
Wipe the board with a duster and then tap the duster against the table. What do you see?
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
______ is not made of matter.
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Gases do not diffuse very easily.
Compressibility of solids: ______.
