The Smell of Perfume Gradually Spreads Across a Room Due to ..................... - Science

Fill in the Blanks

Fill in the following blank with suitable words :

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



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

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Chapter 1: Matter in Our Surroundings - Very Short Answers [Page 18]


Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 1 Matter in Our Surroundings
Very Short Answers | Q 24.2 | Page 18


Give reasons for the following observation:

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

What are the characteristics of particles of matter?

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

What are fluids ? Give two examples.

How a liquid changes into its gaseous state ? Explain ?

Water cycle is an example of inter conversion of states of water. Explain.

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

Fill in the blank:

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

Fill in the blank:

Liquids have no definite ............

Write whether the following statement is true or false.
If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.

Name the phenomenon which cause the following change:

Formation of water vapour from water.

A substance which can change its state

  1. wood
  2. oxygen
  3. paper
  4. cloth

What is volume ?

Give reason Electricity is not considered matter .

Write whether the following statement are true or false.

The intermolecular force of attraction is the weakest in gases.

The state of matter which has no definite shape or volume is called

What is the general name of :

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

State two characteristics of matter demonstrated by diffusion.

Explain the following :

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

Which one of the following statement is correct in respect of fluids?

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

  1. increasing pressure on hydrogen contained in a closed container
  2. some hydrogen gas leaking out of the container
  3. increasing the volume of the container of hydrogen gas
  4. adding more hydrogen gas to the container without increasing the volume of the container

Which of the following statement is incorrect?

Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chlorine? Explain your answer.

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 ____

A glass beaker is half-filled with water and an empty glass tumbler is inverted & lowered inside the glass beaker. State your observations on tilting the tumbler below the level of the water in the glass beaker. Give a reason for your answer.

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

State the term which refers to the conversion of a substance on heating from.

  1. solid-state to liquid state
  2. liquid state to vapour state
  3. vapour state to liquid state
  4. liquid state to solid-state.

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

Fill in the blanks:

Matter is defined as anything that occupies _______ and has _______

Give a reason for the following:

Liquids have one free upper surface only.

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.

The property to flow is unique to fluids. Which one of the following statements is correct?


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