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NCERT solutions for Class 7 Science chapter 6 - Physical and Chemical Changes

Science Textbook for Class 7

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Chapters

NCERT Science Class 7

Science Textbook for Class  7

Chapter 6 - Physical and Chemical Changes

Pages 65 - 66

Q 1 | Page 65

Classify the changes involved in the following processes as physical or chemical changes:

Photosynthesis

Dissolving sugar in water

Burning of coal

Melting of wax

Beating aluminium to make aluminium foil

Digestion of food

Q 2.1 | Page 65

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Cutting a log of wood into pieces is a chemical change. (True/False)

Q 2.2 | Page 65

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Formation of manure from leaves is a physical change. (True/ False)

Q 2.3 | Page 65

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Iron pipes coated with zinc do not get rusted easily. (True/False)

Q 2.4 | Page 65

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Iron and rust are the same substances. (True/False)

Q 2.5 | Page 65

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Condensation of steam is not a chemical change. (True/False)

Q 3.1 | Page 66

Fill in the blanks in the following statements:

When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.

Q 3.2 | Page 66

Fill in the blanks in the following statements:

The chemical name of baking soda is _________.

Q 3.3 | Page 66

Fill in the blanks in the following statements:

Two methods by which rusting of iron can be prevented are _________ and ____ _

Q 3.4 | Page 66

Fill in the blanks in the following statements:

Changes in which only _____ __ properties of a substance change are called physical changes.

Q 3.5 | Page 66

Fill in the blanks in the following statements:

Changes in which new substances are formed are called _________changes

Q 4 | Page 66

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

Q 5 | Page 66

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Q 6 | Page 66

How would you show that setting of curd is a chemical change?

Q 7 | Page 66

Explain why burning of wood and cutting it into small piece are considered as two different types of changes.

Q 8 | Page 66

Describe how crystals of copper sulphate are prepared.

Q 9 | Page 66

Explain how painting of an iron gate prevents it from rusting.

Q 10 | Page 66

Explain why rusting of iron objects is faster in coastal areas than in deserts.

Q 11 | Page 66

The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A) then it burns (Change − B). The following statements pertain to these changes. Choose the correct one

1) Process − A is a chemical change

2) Process − B is a chemical change.

3) Both processes A and B are chemical changes.

4) None of these processes is a chemical change

Q 11 | Page 66

Anaerobic bacteria digest animal waste and produce biogas (Change − A).

The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.

1) Process − A is a chemical change.

2) Process − B is a chemical change.

3) Both processes A and B are chemical changes

4) None of these processes is a chemical change

NCERT Science Class 7

Science Textbook for Class  7

NCERT solutions for Class 7 Science chapter 6 - Physical and Chemical Changes

NCERT solutions for Class 7 Science chapter 6 (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 CBSE Science Textbook for Class 7 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. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7 Science chapter 6 Physical and Chemical Changes are Concept of Physical Changes, Concept of Chemical Change, Rusting of Iron, Concept of Crystallisation.

Using NCERT 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 NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 7 prefer NCERT Textbook Solutions to score more in exam.

Get the free view of chapter 6 Physical and Chemical Changes Class 7 extra questions for Science and can use shaalaa.com to keep it handy for your exam preparation

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