What is the Relation Between Intermolecular Space and Intermolecular Force ? - Chemistry

Short Note

What is the relation between intermolecular space and intermolecular force ?



The force of attraction between the molecules of a given substance is called intermolecular force and the space between these molecules is called intermolecular space.
The basic relation between the two is that they are inversely proportional to each other. More is the intermolecular force lesser is the intermolecular space and vice-versa.

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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 18


Which of the following are matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

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 ______.

Give two example of the following:

The substances which do not change their state on heating.

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

 Name the three states of matter and define them.

Give reason:
A red ink drop added to small amount of water in a glass turns water red in some time.

Fill in the blank:

Water boils at ............

 Match the columns.

(1) iron and gold (a) molecules are very far apart
(2) melting (b) pure substance
(3) intermolecular space (c) non - metals
(4) compound (d) the space between the molecules 
(5) gases (e) change from solid to liquid 
  (f) metals


Give two examples of the following:

Substances which are rigid and not compressible.

Give reason:

A drop of ink added to water in a glass turns whole water blue.

Give reason of The odour of scent spreads in a room.

Give reason of We can walk through air.

Fill in the blank

Molecules in a ________ are packed very closely.

Fill in the blank

When a gas is cooled, its molecules ________ energy,

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?

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 free diffusion.

A crystal of iodine is placed in a closed flat bottom flask and heated. State how you would conclude from the observations seen, that interparticle space is minimum in solids and maximum in gases.

Fill in the blank:

Particles in a gas possess ___________ kinetic energy.

Give a reason for the following:

Liquids have one free upper surface only.

With reference to the liquid state of matter – answer the following

State why the inter-particles attraction decreases to negligible.

Complete the statement by filling the blank with the correct word given below.

When inter-particle space increases, the inter-particle attractive force _______________.

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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