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. - Chemistry

Short Note

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.



Add one teaspoon of sugar to it and stir. The sugar disappear but the level of water in the glass does not rise that means the volume of water has not increased. Because the sugar particles are adjusted between the water molecules. The shows that there are intermolecular gaps in water.

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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 27.1


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.

Define interconversion of states of matter. What are the two factors responsible for the change of states of matter?

Give reasons:

A gas can fill the whole vessel in which it is enclosed.

Give reasons:
Liquids can flow 

Fill in the blank:

The change of water vapour into water is called ......................

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

How a liquid changes into its gaseous state ? Explain ?

Define the following term.


Write whether the following statement is true or false.

 There is no difference between evaporation and boiling.

Write true or false for statement. Rewrite the false statement correctly.

Solids can be compressed easily.

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.

What is mass ?

Give reason Gases can be compressed easily .

Give reason of A gas fills up the space available to it.

Fill in the blank

When a gas is cooled, its molecules ________ energy,

Write whether the following statement are true or false.

The intermolecular force of attraction is the weakest in gases.

Write whether the following statement are true or false.

Intermolecular force of attraction is greater in gases than in liquids.

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

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

Explain the following :

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

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

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 ____

Name the three states of matter.

State in which of the three states of matter:

Are the atoms or particles far apart

Give a reason why –

Solids have a definite volume & a definite shape.

Fill in the blank:

Particles in a gas possess ___________ kinetic energy.

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?

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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