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Selina solutions for Class 8 Chemistry chapter 1 - Matter

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

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Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Chapter 1: Matter

Chapter 1: Matter solutions [Page 0]

Define of matter.

Define of intermolecular force of attraction.

What are the three states of matter ? Define each of them with two examples.

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

State the main postulates of kinetic theory of matter.

What happens to water if it is kept in a deep freezer.

What happens to water if it is heated and Explain the phenomenon of change of state of water.

 State the law of conversation of mass.

What do you observe when, barium chloride solution is mixed with sodium sulphate solution ?

Give reasons:

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

Solids cannot be compressed.

Give reasons:
  Liquids can flow

When magnesium is burnt in air, there is an increase in mass after the reaction.

Fill in the blank:

The change of a solid into a liquid is called melting or................

Fill in the blank: 

The process in which a solid directly changes into a gas is called ....................

Fill in the blank:

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

Fill in the blank:

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

Give two example of the following:
The substances which sublime.

Give two example of the following:

The substances which do not change their state on heating.

Define of  Diffusion.

Define of  Brownian motion.

When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?

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

Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?

Chapter 1: Matter solutions [Page 0]

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 of intermolecular force of attraction.

Define of 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 for the following.

Gases can be compressed easily.

Give reason for the following.

Liquids can flow easily.

Give reason for the following.

We need to classify things.

Give reason for the following.

Pure substances have fixed melting or boiling points.

Give reason for the following.

Electricity is not considered matter.

Define matter.

Define the following term.

Intermolecular force

Define the following term.

Element

Define the following terms.

Atom

Define the following term.

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:
 Why do liquids and gases flow but solids do not ?

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

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

 Give reason:
We can walk through air.

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

Give reason:
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

Chapter 1: Matter solutions [Page 0]

 Fill in the blank:

Water is a matter because it has mas 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 liquid.

Fill in the blank:

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 .............

Write whether the following statement is true or false.
Only water can exist in three different states.

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.

Write whether the following statement is true or false.
Solids have the largest inter-molecular space.

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

Write whether the following statement  is true or false.
The intermolecular force of attraction is the weakest in gases.

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

Write whether the following statement is true or false.
 Intermolecular force of attraction is greater in gases than in liquids.

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

 Matter cannot exist in different states.

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

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

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

Solids and liquids can flow.

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

Solids can be compressed easily.

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

The smallest part of an element capable of independent existence 4s called an atom.

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

The intermolecular space in a gas is almost negligible.

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

For the following statement, say whether it describe a solid, a liquid or a gas.
 Particles are quite close together.

For the following statement, say whether it describes a solid, a liquid or a gas.
Particles are far apart and move in all directions.

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.

 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

 

Name the phenomenon which cause the following change:

Formation of water vapour from water.

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

Name the phenomenon which cause the following change:

Conversion of ice into water.

Name the phenomenon which cause the following change:

Conversion of water into steam.

Give two example of the following:
The substances which sublime.

Give two examples of the following:

Substances which do not change their states.

Give two examples of the following:

Substances which are rigid and not compressible.

Chapter 1: Matter solutions [Page 0]

Which one is a kind of matter:

  1. light
  2. petroleum
  3. sound
  4. heat

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

  1. solid
  2. liquid
  3. gas
  4. water

 There are large intermolecular gaps in

  1. water
  2. iron ball
  3. common salt
  4. air

All kinds of matter

  1. occupy space and have definite mass
  2. have mass and definite shape
  3. can change their states
  4. have definite volume

A kind of matter which can sublinje is

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

A substance which can change its state

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

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

  1. freezing
  2. melting
  3. condensation
  4. evaporation

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.

Which of the following is a property of the liquids ?

  1. they can flow
  2. they are malleable
  3. they have a definite shape
  4. they are rigid

 Gases

  1. cannot be compressed easily,
  2. occupy the entire space of the container.
  3. have definite shapes.
  4. cannot flow.

Chapter 1: Matter

Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Selina solutions for Class 8 Chemistry chapter 1 - Matter

Selina solutions for Class 8 Chemistry chapter 1 (Matter) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 8 Chemistry chapter 1 Matter are Main Postulates of Kinetic Molecular Theory of Matter, Change of State of the Matter on the Basis of Inter Particle Space and Inter Particle Attraction and Collision, Law of Conservation of Mass Statement and Explanation with Examples).

Using Selina Class 8 solutions Matter exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 1 Matter Class 8 extra questions for Chemistry and can use Shaalaa.com to keep it handy for your exam preparation

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