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Selina solutions for Concise Chemistry Class 7 ICSE chapter 2 - Physical and Chemical Changes [Latest edition]

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Concise Chemistry Class 7 ICSE - Shaalaa.com

Chapter 2: Physical and Chemical Changes

ExerciseObjective Type QuestionsMultiple Choice QuestionsAdditional questions

Exercise

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Exercise

Exercise | Q 1.1

Define physical change. Give two examples for the above changes.

Exercise | Q 1.2

Define a chemical change. Give two examples of the above changes.

Exercise | Q 2

What are reversible and irreversible changes ? Give one example for each.

Exercise | Q 3

Mention a change which is always

Exercise | Q 4

Is burning a physical change or a chemical change? Why?

Exercise | Q 5

A burning candle shows both physical and chemical changes. Explain ?

Exercise | Q 6

State three differences between evaporation and boiling

Exercise | Q 7

State four differences between physical and chemical changes.

Exercise | Q 8.1

What do you observe when :

water is boiled

Exercise | Q 8.2

What do you observe when :

a piece of paper is burnt

Exercise | Q 8.3

What do you observe when :

some ice cubes are kept in a glass tumbler

Exercise | Q 8.4

What do you observe when :

solid ammonium chloride is heated

Exercise | Q 8.5

What do you observe when :

an iron nail is kept in tap water for few days

Exercise | Q 8.6

What do you observe when :

a spoon of sugar is heated in a pan

Exercise | Q 8.7

What do you observe when :

lighted match stick is brought near the mouth of the test tube containing hydrogen gas.

Exercise | Q 8.8

What do you observe when :

ime is dissolved in water.

Exercise | Q 8.9

What do you observe when: little amount of curd is added to a bowl containing warm milk and kept for five hours.

Exercise | Q 9

Name a chemical change which takes place in presence of:

Objective Type Questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Objective Type Questions

Objective Type Questions | Q 1.1

Fill in the blank

A new substance is always formed in a _______ change.

Objective Type Questions | Q 1.2

Fill in the blank.

Melting of ice is a _______ change.

Objective Type Questions | Q 1.3

Fill in the blank.

When a candle burns, wax melts. Melting of wax is a ________ change.

Objective Type Questions | Q 1.4

Fill in the blank

Chemical change occurs as a result of __________ between two substances.

Objective Type Questions | Q 1.5

Fill in the blank

Burning of fuel is a _______ change.

Objective Type Questions | Q 1.6

Fill in the blank

Revolution of the earth around the sun is a ________ change.

Objective Type Questions | Q 1.7

Fill in the blank.

Growing of a seedling into a plant is _______ change.

Objective Type Questions | Q 2.01

State whether the following is physical or chemical changes.

glowing of a bulb -

Objective Type Questions | Q 2.02

State whether the following is physical or chemical changes.

burning of sugar — 

Objective Type Questions | Q 2.03

State whether the following is physical or chemical changes.

heating of water —

Objective Type Questions | Q 2.04

State whether the following is physical or chemical changes.

growing of a piglet into a pig — 

Objective Type Questions | Q 2.05

State whether the following is physical or chemical changes.

burning of wood -

Objective Type Questions | Q 2.06

State whether the following is physical or chemical changes.

passing electric current through a heater rod —

Objective Type Questions | Q 2.07

State whether the following is physical or chemical changes.

water cycle in nature —

Objective Type Questions | Q 2.08

State whether the following is physical or chemical changes.

respiration in living beings —

Objective Type Questions | Q 2.09

State whether the following is physical or chemical changes.

shaping a piece of glass —

Objective Type Questions | Q 2.1

State whether the following is physical or chemical changes.

lightning — 

Objective Type Questions | Q 2.11

State whether the following is physical or chemical changes.

(energy produced) dissolving sugar in water —

Objective Type Questions | Q 2.12

State whether the following is physical or chemical changes.

heating a mixture of iron filings and sulphur—

Objective Type Questions | Q 2.13

State whether the following is physical or chemical changes.

mixing oil with water —

Objective Type Questions | Q 2.14

State whether the following is physical or chemical changes.

cutting wood into small pieces — 

Objective Type Questions | Q 2.15

State whether the following is physical or chemical changes.

photosynthesis — 

Objective Type Questions | Q 2.16

State whether the following is physical or chemical change.

Digestion of food —

Objective Type Questions | Q 2.17

State whether the following is physical or chemical changes.

Melting of wax —

Objective Type Questions | Q 2.18

State whether the following is physical or chemical changes.

Boiling of an egg — 

Objective Type Questions | Q 2.19

State whether the following is physical or chemical changes.

Slaking of lime — 

Objective Type Questions | Q 3

Match the following:

Column A Column B
(a) Evaporation of water (i) Non-periodic change
(b) Milk turning sour (ii) Periodic change
(c) Earthquake (iii) Chemical change
(d) Change of seasons (iv) Physical change
(e) Glowing of bulb (v) Reversible change
Objective Type Questions | Q 4.1

Write true or false

Cutting of paper into pieces is a chemical change.

  • True

  • False

Objective Type Questions | Q 4.2

Write true or false

Rusting of iron is a chemical change.

  • True

  • False

Objective Type Questions | Q 4.3

Write true or false 

Earthquake is a desirable change.

  • True

  • False

Objective Type Questions | Q 4.4

Write true or false 

Melting of ice is a physical change.

  • True

  • False

Objective Type Questions | Q 4.5

Write true or false 

Burning of sugar is a temporary change.

  • True

  • False

Multiple Choice Questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Multiple Choice Questions

Multiple Choice Questions | Q 1

Tick (√) the correct alternative from the choice given for the following statement.

A substance which can not sublime is

  • iodine

  • camphor

  • sugar

  • dry ice

Multiple Choice Questions | Q 2

Tick (√) the correct alternative from the choice given for the following statement.

When you put some ice cubes in a glass, droplets of water are formed on the outer wall of the glass. This explains the phenomenon of

  • melting

  • freezing

  • condensation

  • evaporation

Multiple Choice Questions | Q 3

Tick (√) the correct alternative from the choice given for the following statement

Burning is a

  • slow process

  • fast process

  • natural process

  • none of the above

Multiple Choice Questions | Q 4

Tick (√) the correct alternative from the choice given for the following statement

Which one of the following is volatile in nature ?

  • common salt

  • petrol

  • water

  • milk

Multiple Choice Questions | Q 5

Tick (√) the correct alternative from the choice given for the following statement.

An example of both physical and chemical change is

  • burning of candle

  • melting of ice

  • cooking of food

  • blowing of bulb 

Multiple Choice Questions | Q 6

Tick (√) the correct alternative from the choice given for the following statement.

The compound rust is a hydrated oxide of

  • copper

  • aluminium

  • iron

  • gold

Multiple Choice Questions | Q 7

Tick (√) the correct alternative from the choice given for the following statement

When sugar is heated, its colour changes into 

  • red

  • brown

  • black

  • grey

Multiple Choice Questions | Q 8

Tick (√) the correct alternative from the choice given for the following statement

A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.

  • oxygen

  • hydrogen

  • nitrogen

  • water-vapour

Multiple Choice Questions | Q 9

Tick (√) the correct alternative from the choice given for the following statement.

When we add water to the following substances, which one will show a chemical change?

  • Salt

  • Sugar

  • oil

  • quick lime

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

True or false 

Is melting of ice a reversible change?

  • True

  • False

Additional questions | Q 2

True or false 

Change of seasons is a non-periodic change. 

  • True

  • False

Additional questions | Q 3

True or false 

In a physical change no net energy change is involved.

  • True

  • False

Additional questions | Q 4

True or false 

New substances are formed in a chemical change.

  • True

  • False

Additional questions | Q 5

True or false 

Dissolving of a solid in liquid is a physical change. 

  • True

  • False

Additional questions | Q 6

True or false 

Is the process of digestion a physical change?

  • True

  • False

Additional questions | Q 7

True or false?

During a physical change energy is either given out or absorbed by the system. 

  • True

  • False

Additional questions | Q 8

True or false?

In a chemical change, rearrangement of molecules and atoms involves some energy changes. 

  • True

  • False

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Tick the most appropriate answer.

Melting of ice is a

  • reversible change 

  • irreversible change

  • chemical change 

  • none of these 

Additional questions | Q 2

Tick the most appropriate answer.

Rising and setting of the sun at a given place is a

  • periodic change

  • undesirable change

  • physical change

  • reversible change

Additional questions | Q 3

 Tick the most appropriate answer.

Physical changes are

  • permanent

  • periodic

  • temporary 

  • irreversible

Additional questions | Q 4

Tick the most appropriate answer.

Chemical changes involve

  • change in shape

  • change in size

  • change in molecular composition

  • none of these 

Additional questions | Q 5

Tick the most appropriate answer.

Photosynthesis requires

  • heat energy

  • wind energy

  • sunlight

  • sound energy

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.

Additional questions | Q 2

 Fill in the blank

Changes that occur in nature are called ______

Additional questions | Q 3

Fill in the blank

An earthquake is a _______ change.

Additional questions | Q 4

 Fill in the blank

A new substance is formed in a _______ change.

Additional questions | Q 5

Fill in the blank

Heat is ________ by a gas during the process of condensation.

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Match the columns.

 Column  A      Column B 
1. a change which cannot be easily reversed  a. man-made change 
2 a change that repeats itself at regular intervals b. chemical chang 
3. a change that is made by humans  c. physical change
4. a change in which the original substance cannot be obtained   d. periodic change 
5. a change where no new substance is formed  e. irreversible change 
  f . slow change

 

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Write true or false

Burning of paper and formation of curd are reversible changes.

  • True

  • False

Additional questions | Q 2

Write true or false

A natural change can also be a desirable change.

  • True

  • False

Additional questions | Q 3

Write true or false

Deforestation is a man-made change.

  • True

  • False

Additional questions | Q 4

Write true or false 

Decomposition of leaves is a fast change.

  • True

  • False

Additional questions | Q 5

Write true or false 

Dissolving of solute in a solvent and rusting of iron are both physical changes.

  • True

  • False

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Dissolving salt in water is a reversible change.

Additional questions | Q 2

Ripening of fruits is a desirable change.

Additional questions | Q 3

Melting of solid (wax) is a physical change.

Additional questions | Q 4

Chemical changes are accompanied by changes in energy.

Additional questions | Q 5

Photosynthesis cannot take place at night.

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Name two reversible changes.

Additional questions | Q 2

Give two examples of periodic changes.

Additional questions | Q 3

Give an example of desirable change which can also be undesirable.

Additional questions | Q 4

What are man-made changes ?

Additional questions | Q 5

Sublimation is classified as a physical change. Why ?

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Classify the following changes as physical or chemical.

Additional questions | Q 2

A physical change is temporary. Explain.

Additional questions | Q 3

State the Differences Between a Physical Change and a Chemical Change.

Additional questions | Q 4

State the various conditions that favour the process of evaporation.

Additional questions | Q 5

How do you say that the process of digestion is a chemical change ?

Additional questions | Q 6

What role does energy play in initiating a chemical change ?

Additional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 2 Physical and Chemical Changes Additional questions

Additional questions | Q 1

Solve this crossword by using the clues that follow-

Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.

Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.

Additional questions | Q 2

Make a list of different types of changes with example.

Chapter 2: Physical and Chemical Changes

ExerciseObjective Type QuestionsMultiple Choice QuestionsAdditional questions
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Concise Chemistry Class 7 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 7 ICSE chapter 2 - Physical and Chemical Changes

Selina solutions for Concise Chemistry Class 7 ICSE chapter 2 (Physical and Chemical Changes) 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 Concise Chemistry Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide 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 Concise Chemistry Class 7 ICSE chapter 2 Physical and Chemical Changes are Concept of Physical and Chemical Changes, Chemical Change - Formation of a New Product with New Properties., Differentiating Between Physical and Chemical Change., Classification as Physical and Chemical Change., Types of Change Involved When There is a Change of State of Matter, Types of Change Involved When There is a Change of Energy..

Using Selina Class 7 solutions Physical and Chemical Changes 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 7 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 2 Physical and Chemical Changes Class 7 extra questions for Concise Chemistry Class 7 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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