Give Reason Gases Can Be Compressed Easily . - Chemistry

Short Note

Give reason Gases can be compressed easily .



The reason for this property of gases is that there is very large intermolecular space between gas molecules. On mere applying pressure, they are easily compressed.

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Chapter 1: Matter and Its Composition - Additional questions


Selina Concise Chemistry Class 7 ICSE
Chapter 1 Matter and Its Composition
Additional questions | Q 21.1


What are the characteristics of particles of matter?

Fill in the blank:

The temperature at which a liquid starts changing into its vapour state is ______.

How a liquid changes into its gaseous state ? Explain ?

Define the following terms.


Write your observation and conclusion for the following:

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

Write whether the following statement is true or false.

 There is no difference between evaporation and boiling.

Write whether the following statement is true or false.
A gas has no free surface.

Match the following

Column A  Column B 
(a) Solids (1) Can flow in all directions. 
(b) Sublimation  (2) The temperature at which a liquid changes into its gaseous state. 
(c) Boiling point  (3) Any number of free surfaces.
(d) Gases (4) Gaps between particles.
(e) Intermolecular space ro(5) Change of state fm solid to gas.

 Name the phenomenon which cause the following change:
  Disappearance of camphor.

A kind of matter which can sublinje is

  1. water
  2. plastic
  3. milk
  4. iodine

A solid is a state of matter that has

  1. no definite shape.
  2. large intermolecuiar space.
  3. high intermolecuiar force of attraction.
  4. no definite volume.

Fill in the blank :

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

What happens when a solid is heated ?

Give reason  of When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass does not rise.

Fill in the blank

The physical state of a substance, which has a fixed volume but no fixed shape is _______

Fill in the blank 

Matter is anything that has ______ and occupies ______

Write whether the following statement are true or false.

 Solids have the largest inter-molecular space.

A solid is a state of matter that has

Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?

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?

Fill in the following blank with suitable words :

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

State two characteristics of matter demonstrated by diffusion.

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.

Which of the following statement is incorrect?

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 ____

Name the three states of matter.

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

State in which of the three states of matter:

The space between the particles is minimum.

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.

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.


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