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Selina solutions for Class 8 Chemistry chapter 2 - Physical and Chemical Changes

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 2: Physical and Chemical Changes

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Tick the most appropriate answer.

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

  1. periodic cehang
  2. undesirable change
  3. physical change
  4. reversible change

 Tick the most appropriate answer

2. Melting of ice is a

  1. reversible change
  2. irreversible change
  3. chemical change
  4. none of these

Tick the most appropriate answer.

4. Chemical changes involve

  1. change in shape.
  2. change in size.
  3. change in molecular composition.
  4. none of these

 Tick the most appropriate answer.

5. Photosynthesis requires

  1. heat energy.
  2. wind energy
  3. sunlight.
  4. sound energy

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Fill in the blank

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

 Fill in the blank.

Changes that occur in nature are called ........................

Fill in the blank.

An earthquake is a .................. change.

Fill in the blank.

A new substance is formed in a ............... change.

Fill in the blank.

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

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Match the columns

           column A                coulmn B 
1. A change which cannot be  easily reversed  a. man-made change 
2.A change that repeats itself at  regular  intervals b. chemical change 
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 formade  e. irreversible change 
  f. slow change

Chapter 2: Physical and Chemical Changes solutions [Page 0]

 Write true or false for the statement.

Burning of paper and formation of curd are reversible changes

 

Write true or false for the statement

A natural change can also be a desirable change

 Write true or false for the statement.

Deforestation is a man-made change

Write true or false for the statement

Decomposition of leaves is a fast change.

Write true or false for the statement.

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

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Dissolving salt in water is a reversible change.

 

Ripening of fruits is a desirable change.

Tick the most appropriate answer.

3. Physical changes are

  1. permanent.
  2. periodic,
  3. temporary
  4. irreversible.

Melting of solid (wax) is a physical change.

Chemical changes are accompanied by changes in energy.

Photosynthesis cannot take place at night.

Chapter 2: Physical and Chemical Changes solutions [Page 0]

 Write short answer.

Name two reversible changes.

Write short answer.

Give two examples of periodic changes

 Write short answer.

Give an example of desirable change which can also be undesirable

 Write short answer.

What are man-made changes ?

Write short answer.

Sublimation is classified as a physical change. Why ?

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Classify the following changes as physical or chemical:-boiling

Classify the following changes as physical or chemical: curdling of milk

Classify the following changes as physical or chemical:- photosynthesis in plants

Classify the following changes as physical or chemical:- melting of a solid (wax)

A physical change is temporary. Explain.

State the differences between a physical change and a chemical change.

State the various conditions that favour the process of evaporation.

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

What role does energy play in initiating a chemical change ?

Chapter 2: Physical and Chemical Changes solutions [Page 0]

Make a list of different types of changes with example.

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

Chapter 2: Physical and Chemical Changes

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 2 - Physical and Chemical Changes

Selina solutions for Class 8 Chemistry 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 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 2 Physical and Chemical Changes are Concept of Physical and Chemical Changess.

Using Selina Class 8 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 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 2 Physical and Chemical Changes Class 8 extra questions for Chemistry and can use shaalaa.com to keep it handy for your exam preparation

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