Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 1 - Matter and Its Composition [Latest edition]

Define matter.

What is the difference between mass and weight?

If an object weighs 6 N on earth what will be its weight on moon. What will be the change in its mass?

Write your observation and conclusion for the following:

When few marbles are put in a glass half-filled with water.

Write your observation and conclusion for the following:

Ice is kept at room temperature.

State three main characteristics of the particles of matter.

Differentiate between an atom and a molecule.

Define: Solid

Define: Liquid.

Define: Gas.

Why are liquids and gases called as fluids.

Define interconversion of states of matter.

Why do solids, liquids and gases differ in their physical state?

Under what conditions do solids, liquids and gases change their state.

When a stone is dipped in a glass containing some water, the level of water rises but when a spoon of sugar is added to it and stirred, the water level does not rise?

Give reason:

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

Fill in the blank :

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

Fill in the blank:

The molecules are made up of ________

Fill in the blank:

The quantity of matter in an object is called its _____

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The state of matter with definite volume and definite shape is called______

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The substances which can flow are called ________

Name the terms for the change of a solid into liquid.

Name the terms for the force of attraction between the molecules of matter.

Name the terms for the particles of matter which may or may not have independent existence.

Name the terms for the process due to which a solid directly changes into its vapours.

 Name the terms for the change of vapour into a liquid.

Classify the following into solid, liquid and gas:

Coal, kerosene, wood, oxygen, sugar, blood, water vapour, milk, wax.

Define matter.

What is volume ?

What is mass ?

If an object weighs 6 kg on earth. What will be its weight on moon ?

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

Name the smallest particle from which matter is made up.

What are molecules ?

Give one difference between atoms and molecules.

Define Intermolecular force of attraction.

Define  Intermolecular space.

Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.

Why do solids, liquids and gases differ in their physical states?

What are fluids ? Give two examples.

Define interconversion of states of matter.

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

How a liquid changes into its gaseous state ? Explain ?

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

State the general properties of a solid.

What is the relation between intermolecular space and intermolecular force ?

Why liquids do not have a definite shape ?

What happens when a solid is heated ?

Give reason Gases can be compressed easily .

Give reason Liquids can flow easily 

Give reason We need to classify things .

Give reason Pure substances have fixed melting or boiling point .

Give reason Electricity is not considered matter .

Define the following term  of Matter .

Define the following term Intermolecular force .

Define the following term Element .

Define the following term  of Atom .

Define the following term of Molecule .

Write your observation and conclusion for the following,

When a small stone is gently dipped into a glass filled with water.

Write your observation and conclusion for the following

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

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

Name the three states of matter and define them.

Give reason of Why do liquids and gases flow but solids do not ?

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

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

Give reason of We can walk through air.

Give reason of Liquids have definite volume but no difinite shape.

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.

Give reason

When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar.

Give reason

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

Give an experiment to explain that there are intermolecular spaces between water molecules.

Differentiate between the following.

Liquids and gases .

Differentiate between the following.

Atoms and Molecules .

Fill in the blank.

Water is a matter because it has mass and occupies _______

Fill in the blank

Any matter which has a definite _______ but no definite shape is called a _______

Fill in the blank

_______ can flow.

Fill in the blank

The molecules are at a greater distance in ______ compared to liquids.

Fill in the blank

Water boils at ______

Fill in the blank

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

Fill in the blank

All matter is made up of tiny particles called ______

Fill in the blank

Liquids have a definite ______

Fill in the blank

The temperature at which a liquid boils is called the _________point of that liquids

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Molecules in a ________ are packed very closely.

Fill in the blank

Liquids have no definite ______

Fill in the blank

When a gas is cooled, its molecules ________ energy,

Fill in the blank 

Matter is anything that has ______ and occupies ______

State whether the following statement is True or False:

Only water can exist in three different states

 True or false.

If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.

Write whether the following statement are true or false.

 Solids have the largest inter-molecular space.

Write whether the following statement are true or false.

There is no difference between evaporation and boiling.

Write whether the following statement are true or false.

All solids, on heating, first change to the liquid and then to the gaseous state always.

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.

A gas has no free surface.

Write whether the following statement are true or false.

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

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

Matter cannot exist in different states.

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

If the intermolecular space is more than the intermolecular force will be weaker.

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

 Solids and liquids can flow.

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

Solids can be compressed easily.

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

The smallest part of an element capable of independent existence is called an atom.

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

The intermolecular space in a gas is almost negligible.

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

For the following statements, say whether it describes a solid, a liquid or a gas.

Particles are quite close together

For the following statements, say whether it describes a solid, a liquid or a gas.

Particles are far apart and move in all directions 

Name the phenomenon which causes the Formation of water vapour from water is 

Name the phenomenon which causes the Disappearance of camphor is

Name the phenomenon which causes the Conversion of ice into water is

Name the phenomenon which causes the Conversion of water into steam is 

Give two examples for the following :

Substances which sublime.

Give two examples for the following :

Substances which do not change their states.

Give two examples for the following :

Substances that are rigid and not compressible.

Which one is a kind of matter:

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

There are large intermolecular gaps in

All kinds of matter

A kind of matter which can sublime is

A substance which can change its state

The process by which a solid change into a liquid is called

A solid is a state of matter that has

Which of the following is a property of the liquids?

Gases