Explain the Following : When an Incense Stick is Lighted in the Corner of a Room, Its Fragrance Spreads Quickly in the Entire Room. - Science

Short Note

Explain the following :

When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.



The fragrance of lit incense stick spreads quickly in the room because the particles of matter are continuously moving in all directions. Both air and fragrance of  incense stick have large intermolecular spaces. Due to this, the particles of one can easily occupy the inter-molecular spaces of the other.

  Is there an error in this question or solution?
Chapter 1: Matter in Our Surroundings - Very Short Answers [Page 19]


Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 1 Matter in Our Surroundings
Very Short Answers | Q 34 | Page 19


A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

What are the characteristics of particles of matter?

Give reasons:
Liquids can flow 

What do you observe when a gas jar which appears empty is inverted over a gas jar containing Bromine vapours? Name the phenomenon.

What is volume ?

How will you prove by an experiment that solids occupy space ?

Fill in the blank:

..............can flow

Fill in the blank:

Water boils at ............

For the following statement, say whether it describes a solid, a liquid or a gas.
 Particles move about very quickly.

Name the phenomenon which cause the following change:

Conversion of ice into water.

Fill in the blank :

Air is a matter because it has ________ and _______ and it can be _________

If an object is taken to the moon from the earth what will be its mass ?

Why liquids do not have a definite shape ?

Write your observation and conclusion for the following

When one of the balloons suspended to the metre scale is punctured while other remains inflated ?

Fill in the blank

Molecules in a ________ are packed very closely.

Fill in the blank 

Matter is anything that has ______ and occupies ______

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

What is the general name of :

  1. rigid form of matter ?
  2. fluid forms of matter ?

Fill in the following blank with suitable words :

The smell of perfume gradually spreads across a room due to .....................

Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

What is meant by 'diffusion'? Give one example of diffusion in gases.

Which one of the following statements is not true?

  1. the molecules in a solid vibrate about a fixed position
  2. the molecules in a liquid are arranged in a regular pattern
  3. the molecules in a gas exert negligibly small forces on each other, except during collisions
  4. the molecules of a gas occupy all the space available

Define: diffusion

 Define: interconversion of states of matter.

What are the two conditions for the interconversion of states of matter?

Give reasons for the following:

Solids have a definite shape and are highly rigid while gases have to definite shape and are least rigid.

Give reasons for the following:

Sugar can be distinguished from talcum powder using water.

Give reasons for the following:

Water on freezing turns into ice.

Give reasons for the following:

A bottle of perfume on opening evolves an odour which can be sensed over a long distance.

Complete the statement given below by selecting the correct word.

The space between atoms in gases is maximum while in ____ is minimum,

Fill in the blank with the correct word Given below.

The space between atoms’ [molecules] of solids is ____

Define the Gas and give two examples.

Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to space.

Match the characteristics of the three states of matter in List I with their correct answer from List II.

List I List II
1. Have no definite shape, volume or free surface A: Solids only
2. Are highly compressible and least rigid B: Liquids only
3. Have a definite volume, no definite shape and are slightly diffusable C: Gases only
4. Are not compressible and have no diffusability D: Liquids and gases only
5. Have mass and occupy space E: Solids and gases only
  F: Solids, liquids and gases

Give a reason for the following:

Liquids have one free upper surface only.

State in which of the following examples ie. a piece of wood, water, light gas is the Energy possessed by particles of matter, very large.

Give the reason for the following 

Particles of matter move more rapidly on the application of heat.

200 ml of water is poured into a bowl of 400 ml capacity. The volume of water will be ______.

Among the following ______ is not a mixture.

Water obtained from tube wells is usually ______ water.

Air is not compressible.

Match the following.

Property Example
Breaks easily (Brittle) Metal pan
Bends readily Rubber band
Can be stretched easily Cotton wool
Gets compressed easily Mud pot
Gets heated readily Plastic wire

Mr. Raghu returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has the only curd. What can she do to get buttermilk? Explain

In a glass containing some water, tamarind juice and sugar are added and stirred well. Is this a mixture? Can you tell why? Will this solution be sweet or sour or both sweet and sour?

Which one of the following element name is not derived from planet?

The Cow and Birds are nonliving things.

Mention any two characteristics of the particles of matter.


      Forgot password?
Use app×